The 2nd Symposium for Collaborative Research on Energy Science and Technology+

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Welcome Message from the Chairperson

It is a great pleasure for me to represent the Kogakuin University of Technology &Engineering, and welcome you at the 2nd symposium for collaborative research on energy science andtechnology, 2nd SCREST. The SCREST aims to promote an important consortium between the
National university of Singapore and Kogakuin University of Technology & Engineering.
Fortunately, both universities have many young researchers related intensively to the state-of-theart energy materials. I wish young researchers including students will have innovative discussions
throughout the 2nd SCREST.
I hope you will contribute to this future-oriented symposium as an invaluable resource. It
is my great pleasure to invite Prof. Lu Li to this present SCREST. I wish you an enjoyable stay here
and have a productive and successful symposium. Finally, I would like to thank the Japan Scienceand Technology Agency (JST) and organizing committee members, and also express my particularappreciations to the National University of Singapore.

Sincerely Yours,

Mitsunobu Sato
President, Kogakuin University

The 2nd Symposium for Collaborative Research on Energy Science and Technology

The 2nd Symposium for Collaborative Research on Energy Science and Technology(SCREST-2nd)
July 4th-6th, 2019, Kogakuin Fujiyoshida Seminar House, Japan
Main theme of SCREST-2nd: Energy Materials and Devices for Innovation
Topics of SCREST-2nd include, but not limited to:• Energy materials• Hydrogen energy• Hydrogen production• Fuel cells• Biofuels• Solar energy• Alternative energy• Photocatalysis• Supercapacitors• Photovoltaics• Nanomaterials• Nanoenergy• Geothermal Energy
Organized by
Kogakuin University
National University of Singapore
Co-Organized by
Functional Materials Society
Sponsored by
Japan Science and Technology Agency (JST, SAKURA Exchange Program in Science)
Kogakuin University

The 2nd Symposium for Collaborative Research on Energy Science and Technology

INVITATION
Dear Colleagues,
To solve global problems, interdisciplinary collaboration is being required. The innovative
energy materials would be created by collaborating among various researchers in the fieldof physics, chemistry, materials, mechanical, and electrical engineering, because suchcollaboration can promote effective acquisition of state-of-the-art technology in each field.
The SCREST-2nd (The 2nd Symposium for Collaborative Research on Energy Science andTechnology) will be held at Kogakuin Fujiyoshida Seminar house from July 4th to 6th, 2019.
The International Advisory and Organizing Committees cordially invite you to attend thesymposium and participate in its scientific programs. In this symposium, we aim toconstruct a novel consortium between the two universities, having many young researchers
related intensively to energy materials. Presentations will consist only oral presentation.
The official language of the symposium will be English.
Important Deadlines
Deadline of Abstract Submission; July 3, 2019
Congress Date; July 4-6, 2019
July 4: Reception
July 5: Presentations/Banquet
July 6: Excursion

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Advisory and Committee members
Organizing committee
Chairperson:
Mitsunobu Sato

President of Kogakuin University

Co-chairperson:
Li Lu

National University of Singapore

Committee member
Kaiyang Zeng

National University of Singapore

Jun Min Xue

National University of Singapore

Daniel Chua

National University of Singapore

Hua Chun Zeng

National University of Singapore

Ichiro Takano

Kogakuin University

Toshinori Okura

Kogakuin University

Tetsuo Sakamoto

Kogakuin University

Tohru Honda

Kogakuin University

Hiromitsu Takaba

Kogakuin University■Language
English will be the official language during the symposium.
■Symposium Venue
The symposium will be held at Kogakuin Fujiyoshida Seminar House.
CORRESPONDENCE
If you have any inquiry, you can contact with the general secretary via e-mails in the URL.
Hiroki Nagai (KU)
Tel: +81-42628-4616
E-mail: nagai@cc.kogakuin.ac.jp

The 2nd Symposium for Collaborative Research on Energy Science and Technology

ORAL PRESENTATIONS:This symposium has only oral presentation.
Keynote: Speaker has 40 minutes for their presentation. With approximately 35 minutes
given for the presentation followed by 5 minutes for questions and answers.
Oral: Speaker has 10 minutes for their presentation. With approximately 7 minutes given
for the presentation followed by 2 minutes for questions and answers.
Standard facilities for PC presentations will be available at the symposium site.

GUIDELINES:
Abstracts should be prepared according to the abstract template. The abstract should besent via e-mail (nagai@cc.kogakuin.ac.jp). The deadline for abstract submission would be
July 3, 2019. The authors are encouraged to submit a camera-ready abstract (A5-size with
25 mm margins on all sides) in Word or PDF format. Use Times New Roman font. In the
PDF file case, all fonts should be embedded in the file. The font size should be boldfaced 14
point for the title and 11 point for the remaining. The abstract should be completed within
one page without figures and tables.
The abstract should be completed within one pages.
Papers in the form of electronic file should be submitted by e-mail to the following address:
nagai@cc.kogakuin.ac.jp

Chair: Prof. Tohru Honda
10:30-10:40

Opening

Prof. Tetsuo Sakamoto

10:40-11:20

Keynote 1

Prof. Li Lu
Principle of Design of Solid Ionic Conductor

11:20-12:00

Keynote 2

Prof. Tetsuo Sakamoto
Development of High Spatial Resolution TOF-SIMS for Nano-Scale Mass
Imaging of Industrial, Biological, Environmental Samples

12:00-13:00

Lunch

Chairman: Dr. Hsiang-Jung Wu
13:00-13:10

Oral 1

Mr. Jin An Sam Oh
TOF-SIMS Characterization of NASICON electrolyte

13:10-13:20

Oral 2

Mr. Takashi Kusachi
Deep Learning to Identify Original Molecule from Mass Spectrometry

13:20-13:30

Oral 3

Ms. Xinyu Dong
Electronic structure of Nickel-rich cathodes materials
LiNi0.8Mn0.1Co0.1O2 of lithium-ion batteries based on first-principles density
functional theory

13:30-13:40

Oral 4Mr. Sota Nanbu
Preparation of Na5YSi4O12 thin film by sol-gel method

13:40-13:50

Oral 5

Ms. Qiaomei Sun
LAGP/PEO Based Polymer Electrolytes Towards Li-metal Solid Batteries

13:50-14:00

Oral 6

Ms. Naamo Suzuki
New type polyether/Li1.5Al0.5Ge1.5(PO4)3 hybrid Li-conductive solid electrolyte

14:00-14:10

Oral 7

Ms. Jingjing Wang
Preparation and photosensitivity of CNT/WO3 composite thin films

14:10-14:30

Tea Break

Chairman: Dr. Shiro Seki
14:30-14:40

Oral 8

Mr. Kazuya Tamura
Analysis of water-containing biological sample by TOF-SIMS

14:40-14:50

Oral 9Ms. Serene Wen Ling Ng
Fabrication and photosensitivity of CNT/TiO2 composite thin films on quartz
glass substrate prepared by MPM

14:50-15:00

Oral 10

Mr. Nao Wakabayashi
Growth and Structural Characterization of Cu3N by Mist CVD

15:00-15:10

Oral 11

Mr. Zhongkai Hao
Fabrication of TiO2 and LCO films on FTO by doctor-blading for Energy storage

15:10-15:20

Oral 12

Mr. Yutaka Suwazono
Fabrication of Li2MnO3 thin film for photovoltaic charge/discharge thin film
device using molecular precursor method

15:20-15:30

Oral 13

Mr. Jiaxin Yan・Growth of p-type NiO on C-Sapphire through Mist CVD Method
・Synthesis of Ag Nanowire Doped Ga2O3 Thin Film through Solution Mixing,
Casting and Heat Treatment

15:30-15:40

Oral 14

Mr. Gen Nakayama
Fabrication of photovoltaic lithium-ion-battery using Li+-involved nickel oxide
as a cathodic active material

15:40-16:00

Tea Break

Chairman: Dr, Hiroki Nagai
16:00-16:10

Oral 15

Ms. Ting Xiong
Optimizing Electrolyte Physiochemical Properties toward Stable Aqueous Zinc
Ion Battery

16:10-16:20

Oral 16

Mr. Kenta Watarai
Development of freeze-fracture system for wet samples and devices

16:20-16:30

Oral 17

Ms. Wenqian Zhang
Glass-Ceramics based electrolyte for all solid state sodium ion batteries

16:30-16:40

Oral 18

Mr. Koji Hiraoka
Polymer/inorganic composite electrolyte for all-solid-state Na battery

16:40-16:50

Oral 19

Ms. Lei Zhang
Electrochemical Measurement of Single-Particle Li-ion Battery Materials using
Microprobe

16:50-17:00

Oral 20

Mr. Hiroki Hirukawa
XRD-RSM Measurements of GaInN Films Grown on GaN/sapphire templates
at Different Temperatures by RF-MBE

17:00-17:15

Closing

17:30-19:30

BanquetProf. Mitsunobu Sato (President, KUTE)

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Principle of Design of Solid Ionic Conductor (SCREST-2nd)
Li Lu
Department of Mechanical Engineering

National University of Singapore
Abstract
Solid ionic conductor is one of important functional materials that facilitates transportation of particularions. Therefore it has been used in the devices of sensors and energy storages. One of most importantparameters that judges quality of the solid ionic conductor is its ionic conductivity which is controlled
by its crystallographic structure, and density of moving ions and vacancies. This talk will provide
fundamental understanding of inorganic solid electrolyte and principle of ion transportation is the solids,
and its applications.
Keywords: Solid electrolyte; Ionic conductivity; Structure

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Development of High Spatial Resolution TOF-SIMS for Nano-Scale Mass
Imaging of Industrial, Biological, Environmental Samples
Tetsuo SAKAMOTO
Department of Applied Physics, School of Advanced Engineering, Kogakuin University
Abstract
Recent years, small samples are needed to be analyzed. Conventional analysis methods have not been
met these demand satisfactory. Mass spectrometry is a universal method to analyze elements,
compounds and organics, including isotopes. I have developed a “Mass Imaging Apparatus”, where
mass spectrum is acquired pixel-by-pixel. As a result, mass-separated images can be obtained.
Furthermore, design and construction of finely focused ion beam (FIB) enabled us to get spatial
resolution down to 40 nm. History of the development and some applications will be presented in thelecture.
Keywords: LIB, Cell, PM2.5, Yellow-Sand, Focused Ion Beam, Secondary Ion Mass Spectrometry

The 2nd Symposium for Collaborative Research on Energy Science and Technology

TOF-SIMS Characterization of NASICON electrolyte (SCREST-2nd)
Jin An Sam Oh1,2, Masato Morita3, Yue Zhao4, Tetsuo Sakamoto3, Li Lu1*
1Departmentof Mechanical Engineering, National University of Singapore, Singapore 117575, 2Singapore Institute of

Manufacturing Technology, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, Singapore
138634, 3Department of Applied Physics, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo, 192-0015 Japan,
4Collaborative Open Research Center, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo, 192-0015 Japan.

Abstract
NASICON solid-state electrolyte is one of the most promising candidates to be utilized in all-solid-statesodium-ion battery. However, being a polycrystalline material, the total ionic conductivity is mainly
limited by the grain boundary conductivity at room, which includes grain boundary chemistry, secondary
phase, and microstructure. In this study, FIB-TOF-SIMS is utilized to differentiate the main phase(Na 3 Zr 2 Si 2 PO 12 ) and the secondary phase in the NASICON electrolyte by comparing the contrast of
the secondary ion distribution. This characterization method provides an alternative insight of thechemical composition of the solid-state electrolyte at 1-5 nm depth resolution.
Keywords: NASICON; Solid-state electrolyte; Sodium-ion battery

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Deep Learning to Identify Original Molecule from Mass Spectrometry
Takashi Kusachi, Hiromitsu Takaba*Dept. of Environmental Chemistry and Chemical Engineering, Kogakuin University
Abstract
Mass spectrometry is widely used to identify an original molecular structure of organic compounds andproteins. The identification of molecular structure is usually based on the assignment of spectrum peaks
and their mass-ion for a known molecule. This will be done using a database of spectrum data, and there
were many attempt to develop a computer-based analysis method. This method was called as an expert
system in 1980’s, and it was said to be an analysis using artificial intelligence (AI) for the first time.
After 40 years, AI is drastically improved by developing a deep learning method, although it is notwidely used in the research filed of chemistry. In this study we report that the investigation of the deeplearning for identification of known/un-known molecule from database of mass spectrometry.
Keywords: Mass Spectrometry; Machine Learning; Molecular structure

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Title: Electronic structure of Nickel-rich cathodes materials
LiNi0.8Mn0.1Co0.1O2 of lithium-ion batteries based on first-principles density
functional theory (SCREST-2nd)
Dong Xinyu1, Fumiya Hirosawa2, Lu Li1,*, Hiromitsu Takaba2, *Dept. of Mech. Eng., National University of Singapore. E-mail: luli@nus.edu.sg ,1

Dept. of Env.Chem.&Chem.Eng., Kogakuin University. E-mail: takaba@cc.kogakuin.ac.jp

2

Abstract
First-principles density functional theory (DFT) and ultra-soft pseudo potential plane-wave method are
the foundation of calculating electronic structures such as Fermi levels, band structure, density ofstatus and lithium intercalation energy of cathodes. The research started with microscopic atoms andcombines theoretical calculation with experiments. While the CASTEP and DMol3 method was used
to carry out preliminary theoretical calculations on materials such as LiNi0.8Mn0.1Co0.1O2 and othercathodes then compared them. A series of data was obtained that matched the experimental results.
Keywords: LiNi0.8Mn0.1Co0.1O2; First-principles density functional theory (DFT); Li-ion battery

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Preparation of Na 5 YSi 4 O 12 thin film by sol-gel method
S. Nambu, N. Yoshida, K. Yamashita, T. Okura*
Department of Applied Chemistry and Chemical Engineering, Graduate School of Engineering,
Kogakuin University
Abstract
Our group has developed glass-ceramics of Na 5 RSi 4 O 12 (R=Rare earth) as Na+-superionic conductors.
We tried preparation of the Na 5 YSi 4 O 12 Na+-superionic conducting thin films by sol-gel method. Thinfilms were prepared from Na 5 YSi 4 O 12 precursor solutions on a glass substrate by spin-coating method.
After spin-coating, the samples were calcined at 500°C. An amorphous film was obtained from NaNO 3
as the sodium source with 2-C 2 H 5 OC 2 H 4 OH or PVA. A slightly crystallized film was obtained from
NaPF 6 as the sodium source. It can be expected that the Na 5 YSi 4 O 12 phase can be obtained byexamining the calcination conditions.
Keywords: Solid electrolyte; Ionic conduction; Thin film; Sol-gel method

The 2nd Symposium for Collaborative Research on Energy Science and Technology

LAGP/PEO Based Polymer Electrolytes Towards Li-metal Solid Batteries
Qiaomei Sun,1 Masaki Kato,2 Shrio Seki, 2, * Kaiyang Zeng1, *1

Department of Mechanical Engineering, National University of Singapore

2

Department of Environmental Chemistry and Chemical Engineering, School of Advanced

Engineering, Kogakuin University
Abstract
The use of metallic lithium anodes enables higher energy density and higher specific capacity Li-based
batteries. However, Li-ion-conducting ceramics can mechanically suppress dendritic growth but are too
fragile and suffer from poor interfacial contact with the electrodes. Herein, flexible Li-ion-conducting
composite membranes composed of Li1.5Al0.5Ge1.5(PO4)3 (LAGP) particles embedded in a poly(ethyleneoxide) (PEO) based polymer matrix have been fabricated. The ionic conductivity of the electrolyte with
100 wt% LAGP can reach1.12e-4 S/cm at 60 °C, but the resistance increases with the decreasing
temperature. After that, all-solid-state batteries using LiCoO2 as cathode and Li metal as anode havebeen assembled. The first charging capacity of the cell exhibit a high capacity of 107.4 mAh g-1.
Keywords: All-solid-state battery; polymer solid electrolyte; LAGP; PEO polymer.

The 2nd Symposium for Collaborative Research on Energy Science and Technology

New type polyether/Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 hybrid Li-conductive solid
electrolyte
Naamo Suzuki, Masaki Kato, Koji Hiraoka, Shiro Seki *Graduate School of Applied Chemistry and Chemical Engineering, Kogakuin University

Abstract
Recently, all-solid-state Li battery attracts attention as a new type battery. All-solid-state battery uses
solid electrolytes instead of volatile liquid electrolytes. It has high safety and high energy density
owing to their formability of thin-film layer. In general, solid electrolytes can be categorized
into two types. One is polymer electrolyte and the another one is inorganic electrolyte. Purposeof this study is investigation of compatibility for both advantages. We propose inorganic,

Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 , and polyether hybrid electrolytes having flexibility, high conductivity and no
grain boundaries. Ionic conductivity and glass transition temperature of these electrolytes were
investigated. Obtained results suggest the possibility of reduction of grain boundary influences.

Keywords: Polyether electrolyte, Li ion battery, grain boundary

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Preparation and photosensitivity of CNT/WO 3 composite thin films
Wang jingjing1, Gen Nakayama2, Hiroki Nagai2, Zeng Hua Chun1, *, Mitsunobu Sato2, *1

Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National Universityof Singapore, 10 Kent Ridge Crescent, Singapore 119260, 2School of Advanced Engineering,
Department of Applied Physics, Kogakuin University, 2665-1Nakano, Hachioji, Tokyo 192-0015.
Abstract
A WO 3 /carbon nano-tube (CNT) composite thin film was synthesized on the quartz substrate via a spraymethod by using the mixture solution of WO 3 and CNT as precursor. The WO 3 was synthesized from amolecular precursor. Compared with the pure WO 3 film, the mixed WO 3 /CNT thin film shows anenhanced conductivity. As a proof-of-concept application, the WO 3 /CNT thin film can be used as aphoto detector, exhibiting an enhanced photo-sensitivity compared with its pure WO 3 counterpart, which
can be attributed to its enhanced carrier transportation.
Keywords: Tungsten oxide; Multiwall carbon nanotube; Conductivity; Photocurrent.

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Analysis of water-containing biological sample by TOF-SIMS
Kazuya Tamura,1 Takurou Hasegawa,1 Masato Morita,2 Tetsuo Sakamoto1,2,*
1.Graduate School of Electric Engineering and Electronics, Kogakuin University
2.Department of Applied physics, School of Advanced Engineering, Kogakuin University
Abstract
We have developed a high resolution imaging method by using Ga Focused Ion
Beam Time-of-Flight Secondary Ion Mass Spectrometry (FIB-TOF-SIMS). TOF-SIMS
analysis requires introduction of a sample into a high vacuum chamber. As a result, waterand volatile components in the sample evaporate rapidly, and the shape changes. As acountermeasure of these problems, we have developed a mechanism to freeze the sample
and introduce it into the vacuum chamber without contamination from ambient. Hereby
the imaging of hydrated samples with TOF-SIMS has been realized. In this study, we haveexamined analysis technique
Keywords: SIMS, biological sample,

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Fabrication and photosensitivity of CNT/TiO 2 composite thin films onquartz glass substrate prepared by MPM
Serene Wen Ling Ng1, Yuuki Fukuda2, Hiroki Nagai2, Ghim Wei Ho1*, Mitsunobu Sato2*
1

Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering

Drive 3, 117583, Singapore,2

Department of Applied Physics, School of Advanced Engineering, Kogakuin University of Technology

and Engineering, 2665-1 Nakano, Hachioji, Tokyo 192-0015
Abstract
Increasing the conductivity of TiO 2 is important for enhancement of the photocatalytic activity. In thiswork, three samples (TiO 2 , TiO 2 /single-wall carbon nano-tube (SWCNT) and TiO 2 /multi-wall carbon
nano-tube (MWCNT)) were fabricated on quartz glass substrate prepared by the molecular precursor
method (MPM), and the photocatalytic activities were tested. As CNT is conductive, addition of both
SWCNT and MWCNT aid in reducing the resistivity of the nanocomposite, which is favorable for theelectron transfer process from TiO 2 to the CNT. Since TiO 2 /MWCNT has the lowest resistivity of 0.38
Ω cm, it demonstrated MB discoloration of up to 20 % compared to TiO 2 (13 %).

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Growth and Structural Characterization of Cu 3 N by Mist CVD
Nao Wakabayashi1, Mikio Takahashi1, Tomohiro Yamaguchi1, Hiroki Nagai1,
Mitsunobu Sato1, Takeyoshi Onuma1, Tohru Honda,1.
1*Department of Applied Physics, School of Advanced Engineering, Graduate school of Engineering,

Kogakuin University, Tokyo 192-0015, Japan.

E-mail: cm19053@ns.kogakuin.ac.jp.

Abstract
Using mist chemical vapor deposition (mist CVD) method, single-crystalline oxide films can be grownin atmospheric pressure1). In mist CVD, the metal ingredient, such as acetylacetonate, is first dissolvedin the water. The solution is atomized and transformed to a reactor. An oxide film is then grown on asubstrate in the reactor. Recently, we have successfully grown non-oxide film of Cu 3 N by mist CVD
using NH3 aq. solution instead of water. In this presentation, we introduce on the growth of Cu 3 N by
mist CVD. The structural characterization of Cu 3 N film by X-ray diffraction (XRD) is also presented.
1)T. Kawaharamura et al., J. Appl. Phys. Lett. 47, 4669 (2008).
Keywords: Mist CVD growth; Cu 3 N; XRD.

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Title: Fabrication of TiO 2 and LCO films on FTO by doctor-blading forEnergy storage
Zhongkai Hao1, Yutaka Suwazono2, Hiroki Nagai2 , Mitsunobu Sato2, *, Guoqin Xu1, *1

Department of Chemistry, National University of Singapore, Singapore 117543, Singapore.

2

Department of Applied Physics, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano,Hachioji, Tokyo, Japan.

Abstract
Titanium dioxide (TiO 2 ) is one representative transition metal oxide, which is relatively stable, abundant,
eco-friendly, and safe, has attracted tremendous interest as the potential anodes in Li-ion batteries forenergy storage. Here we report a facile one-step synthesis method to produce oxygen vacancy-doped
TiO 2 nanoparticles and oxygen vacancy-doped amorphous TiO 2 nanoparticles. These novel anodematerials are investigated for lithium ion and photovoltaic-lithium ion storage activity, where they
exhibit interesting electrochemical activities in comparison with P25-based control anode.
Keywords: TiO 2 ; Oxygen vacancy; Amorphous structure; PV-Li ion batteries.

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Fabrication of Li 2 MnO 3 thin film for photovoltaic charge/discharge thinfilm device using molecular precursor method
Yutaka Suwazono1, Hiroki Nagai2, Mitsunobu Sato2*
1

Department of Applied Chemistry and Chemical Engineering, Graduate School, Kogakuin University,

Tokyo, Japan, 2Department of Applied Physics, School of Advanced Engineering, Kogakuin University,
Tokyo, Japan
Abstract
Recently, we reported a photovoltaic lithium-ion battery (PV-LIB) with TiO 2 and LiCoO 2 (LCO) thinfilms fabricated on an FTO glass substrate, for the anode and the cathode active materials respectively
by the molecular precursor method (MPM). In the present study, a Li 2 MnO 3 (LMO) thin film instead of
LCO was fabricated by the MPM. The charging voltages, 1.5 and 3.1 V, of the device assembled with
TiO 2 , LMO, and electrolytic solution involving LiPF 6 was recorded using 1-sun irradiation and constantcurrent of 0.05 mA, respectively. Both charging voltages of this device under light irradiation andconstant current was 0.5 V higher than the corresponding PV-LIB assembled with LCO as a cathode.
Keywords: Li 2 MnO 3 thin film; photovoltaic device; molecular precursor method

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Synthesis of Ag Nanowire Doped Ga2O3 Thin Film through Solution Mixing,
Casting and Heat Treatment
Yan Jiaxin1, Hideto Ichinose2, Daniel Chua1*, Hiroki Nagai2*, Tohru Honda2*, Mitsunobu Sato2*
1

National University of Singapore, 2Kogakuin University of Technology and Science, *supervisors

Abstract
Silver Nanowire (Ag NW) doped gallium oxide (Ga2O3) thin film was fabricated. Fabricationprecursor is prepared by mixing ethanol-Ga2O3-EDTA (Ethylenediaminetetraacetic acid) solution withvarious amount of ethanol-suspended Ag NW to attain an overall Ag NW/Ga2O3 molar ratio of 40, 50
and 60 percent. The precursor was casted through spin coating or doctor blade method on quartz
substrate, and then heated treated at 600 oC or 800 oC under argon or air environment. It is found that
more suitable casting method, such as spray coating, might be necessary to attain films with boththinness and silver retention. In addition, ramping up temperature in argon environment till 800 oC andthen swap to purified air could be the best route to prevent silver oxidation as well as eliminating
carbon residue.
Keywords: Ag Nanowire doping, Ga2O3 thin film, precursor mixing, casting, heat treatment

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Growth of p-type NiO on C-Sapphire through Mist CVD Method
Yan Jiaxin1, Nao Wakabayashi2, Daniel Chua1*, Tomohiro Yamaguchi2*, Hiroki Nagai2*,
Mitsunobu Sato2*
1

National University of Singapore, 2Kogakuin University of Technology and Engineering, *supervisors

AbstractNiO (films/particles) was successfully grown on C-Sapphire substrate through novel mist chemical
vapor deposition technique (Mist CVD). Correlation between growth parameters (gas type, gas flow
rate, furnace temperature, and precursor concentration) and the characteristics of the final product wasestablished through tuning of said parameters. The samples were examined with X-Ray diffraction(XRD), scanning electron microscopy (SEM) and Hall Effect measurement. It is found that only withcertain parameters, NiO with film/layer morphology as well as p-type conduction can be grown. The
as-grown films open up possibilities for applications such as p-n junction devices, electrochromic
display and UV-absorbing transparent photovoltaic cells.
Keywords: Mist CVD, NiO, p-type conducting film

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Fabrication of photovoltaic lithium-ion-battery using Li+-involved nickel
oxide as a cathodic active material
Gen Nakayama1, Hiroki Nagai2, and Mitsunobu Sato2*
1)

Electrical and Electronic Engineering Program, Graduate School of Kogakuin University. 2) Dept.

of Applied Physics, School of Advanced Engineering, Kogakuin University, Tokyo, Japan.
*E-mail: lccsato@cc.kogakuin.ac.jp
Abstract
The photovoltaic lithium-ion-battery (PV-LIB), whose anodic and cathodic active materials are TiO 2
and LiCoO 2 thin films on FTO glass substrate respectively, has been reported by our group. A LiNiO 2
molecular precursor solution S LNO was newly prepared and used to fabricate a cathodic thin film. The
precursor film on FTO glass substrate spin-coated with S LNO was preheated and heat treated at 500ºC
for 30 min in air. An XRD pattern indicated that Li 0.301 Ni 1.699 O 2 was formed in the resultant LNO thinfilm. The device assembled using TiO 2 and LNO thin films with an electrolytic solution generates 0.66
V as average voltage under 1-sun light irradiation, indicating a capability of PV-LIB.
Keywords: photovoltaic lithium ion battery; molecular precursor solution; Li 0.301 Ni 1.699 O 2

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Optimizing Electrolyte Physiochemical Properties toward Stable Aqueous
Zinc Ion Battery (SCREST-2nd)
Ting Xiong 1, Hayato Higuchi2, Hiromitsu Takaba2, Jun Min Xue1
1

Department of Materials Science and Engineering, National University of Singapore, Singapore

117573, 2 Department of Environmental Chemistry and Chemical Engineering, School of Advanced
Engineering, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan.
Abstract
Zinc ion battery (ZIB) has recently gained significant research attention. However, ZIB still suffersfrom instability issues caused by water consumption and irreversible by-products. In this work, we
performed molecular-scale modelling of electrolytes composed of Zn(TFSI)2 and ZnSO4, and results
show that the anions interact with Zn2+ to form ion pairs (Zn–TFSI)+ and (Zn–SO4)+ that suppress thepresence of (Zn–(H2O)6)2+.The weak interaction between Zn2+, TFSI+, SO42- and H2O benefits the Zn2+
to desolvate and deposit, and the suppression of Zn hydroxides generated from water decomposition.
Thus, such kind of electrolyte system is expected to develop stable aqueous zinc ion battery.
Keywords: Aqueous zinc ion battery; ion pairs; suppression; excellent stability.

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Title: Development of freeze-fracture system for wet samples and devices(SCREST-2nd)
K. Watarai1, M. Morita2, T. Sakamoto1,2, *1

Graduate School of Electric Engineering and Electronics, Kogakuin University, 2Department ofApplied physics, School of advanced Engineering, Kogakuin University 2665-1 Nakano-machi,
Hachioji, Tokyo 192-0015 Japan, *ct13087@ns.kogakuin.ac.jp
Abstract
Micro/nano scale analysis is one of the most attractive subject in recent years. And it isconsidered that the behavior of the active materials in wet samples and devices should be clarified tomoreover application and deeply understood. Since Time-of-flight secondary ion mass spectrometry(TOF-SIMS), which constructed by our grope, can be cooled to –140°C by circulation of liquid nitrogen,wet samples can be analyzed after it was frozen. In this study, a new freeze-fracture system for wet
samples and devices was developed.
Keywords: TOF-SIMS; rapid freezing; sample preparaion system.

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Glass-Ceramics based electrolyte for all solid state sodium ion batteries
Zhang Wenqian1, Koji Kawada2, Naoya Yoshida2, Toshinori Okura2, Lu Li1*
Faculty of Engineering, National University of Singpore,1

Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University

2

Abstract
Glass-ceramics of the phosphorus-containing Na5YSi4O12-type Na+-superionic conductors were
perpared by crystallization of glasses with the composition Na3+3x-yY1-xPySi3-yO9(x=0.4,y=0.2). The
crystallization kinetics of the glasses was examined by DTA, and the ionic conductivity properties
under different temperatures of glasses and glass-ceramics were discussed. The activation energy ofglass-ceramics decreases and the ionic conductivity of glass-ceramics has a significant increase
compared with glasses.
Keywords: Crystallized glass, Electrolyte, Solid state, Sodium ion battery, Na5YSi4O12-type

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Polymer/inorganic composite electrolyte for all-solid-state Na battery
Koji Hiraoka1, Masaki Kato2, Naamo Suzuki1, Shiro Seki1
1

Graduate School of Applied Chemistry and Chemical Engineering, Kogakuin University, Tokyo,

Japan
The all-solid-state Na battery are attracted attention by high resource abundance and safety asalternative of Li-ion battery. Although inorganic electrolyte shows high ionic conductivity (σ), thismaterial has low interfacial stability with electrodes due to their fragility. The polymer/inorganic
composite electrolytes are proposed in order to be appeared high interfacial stability, σ and flexibility.
Herein, we investigated properties of composite electrolytes to clarify effects of composition ratio
between polymer and inorganic electrolyte.
The composite electrolyte were prepared by polymerization of casted solution containing polyetherbased macromonomer, Na salt, photo-initiator, and Na 3 Zr 2 Si 2 PO 12 (NZSP) as an inorganic electrolyte.
The composite electrolyte showed high σ and flexibility at 30wt% NZSP sample in comparison with
0wt% NZSP. In the contrast, interfacial resistance exhibited lowest value at 200wt% NZSP sample.
Keywords: all-solid-state battery, Na secondary battery, composite electrolyte, polymer

The 2nd Symposium for Collaborative Research on Energy Science and Technology

Electrochemical Measurement of Single-Particle Li-ion Battery Materials
using Microprobe
Lei Zhang1, Takahiro Saito2, Riku Sato2, Yuki Yaguchi2, Shiro Seki2, *, John Wang1, *1

Department of Materials Science and Engineering, National University of Singapore, Singapore

2

Graduate School of Applied Chemistry and Chemical Engineering, Kogakuin University, Japan

Abstract
Conventional electrochemical measurements of battery materials rely on measuring the bulk
performance of devices. The intrinsic properties of the active materials cannot be studied in isolation
due to the incorporation of binders and conductive additives when making the battery device. Herein,
we employ the microprobe technique to measure the electrochemical properties of Li-ion battery
materials at the single particle scale (particle size ~20µm). This novel technique allows the isolation of
the contribution of a single-particle active material and the study of its intrinsic properties.
Keywords: Single-particle electrochemical measurement; Microprobe; Li-ion batteries.

The 2nd Symposium for Collaborative Research on Energy Science and Technology

XRD-RSM Measurements of GaInN Films Grown on GaN/sapphire
templates at Different Temperatures by RF-MBE
Hiroki Hirukawa1, Ryosuke Yoshida1, Tomohiro Yamaguchi1, Takeyoshi Onuma1, and Tohru
Honda1
1

Kogakuin University

Abstract
GaInN alloys are candidate materials for photovoltaic receiver in blue-light optical wireless powertransmission (OWPT) system. The GaInN films have typically been grown on GaN/sapphire templates
because of unavailability of bulk GaInN substrates. Plenty of crystal defects, such as dislocations andpoint defects, are generated due to large lattice mismatch between GaInN and GaN, though appropriate
thickness is necessary to absorb the blue-lights.
In this study, 400-nm-thick GaInN films were grown on GaN/sapphire templates at different
temperatures between 520 and 720°C by RF-MBE. The films were comprehensively investigated by the
XRD-RSM measurements in terms of In composition, relaxation ratio, and dislocation density.
Keywords: GaInN ; RF-MBE ; XRD-RSM.