bluuebunny/crossref_metadata_2025_split huggingface dataset:
Invited Presentation: Present Understanding of the High Capacity Layered Oxide Electrodes
Authors: Tarascon Jean-Marie , Sathiya Mariyappan , Ramesha Kannadka , Abakumov Artem M , Rousse Gwenaelle , Gonbeau Danielle , Doublet Marie-Liesse , Prakash Annigere S , Van Tendeloo Gustaaf 
Published: February 2020

Li-ion batteries have contributed to the commercial success of portable electronics and may soon dominate the electric transportation market provided that major scientific advances including new materials and concepts are developed. Layered oxides of the general formula LiNi1/3Co1/3Mn1/3O2, termed as NMC, display the highest capacity (≈ 200 mAh/g) of any presently used positive electrode materials.1 By modifying the chemical composition through substitution of Li for M in the metal layers, Thackeray’s and Dahn’s groups have confectioned materials displaying reversible capacities exceeding 250 mAh/g.2-3However, their implementation in practical Li-ion cells is still plagued by the complex electrochemical mechanism and large voltage decay upon cycling. Elucidating the origin of large capacity in these materials and the cause of voltage decay so that a practical solution can be identified remains two fundamental challenges addressed by numerous groups worldwide.
In an attempt to understand both the aforementioned issues, we have designed structurally related Li2Ru1-yMyO3 materials (M= Sn, Mn, Ti; 0 ≤ y ≤ 1).4-6 Containing a single redox-active cation and displaying sustainable reversible capacities as high as 230 mAh/g, the Li2Ru1-ySnyO3 phases turn out to be the ideal system to unambiguously show, based on an arsenal of characterization techniques, that the reactivity of these high capacity materials towards Li entails cumulative cationic (Mn+→M(n+1)+) and anionic (“O2–→O2
2–”) reversible redox processes.4 To address the voltage decay issue, Ti4+ (d0) substitution was selected owing to its zero CFSE ,similar to Sn4+(d10), and its smaller size (0.60Å); with the expectation that Ti would be more likely to show accelerated cation migration for direct visualization of migration paths.6

The results of such studies will be reported with the hope that they will help the battery community to develop high capacity layered electrodes free from voltage decays upon cycling.

References:

T. Ozhuku, Y. Makimura, Chem Lett,
30, 642-643 (2001).

M. M. Thackeray,S-H. Kang, C. S. Johnson, J. T. Vaughey,R. Benedek,S. A. Hackney,J. Mater Chem,
17, 3112-3125 (2007).

F. Zhou,X. Zhao,A.Van Bommel, X. Xia,J. R. Dahn, J. Electrochem. Soc.
158, A187-A191 (2011).

M. Sathiya, G. Rousse, K. Ramesha, C. P. Laisa, H. Vezin, M. L. Sougrati, M. L. Doublet, D. Foix, D. Gonbeau, W. Walker, A. S. Prakash, M. Ben Hassine, L. Dupont, J.- M. Tarascon,Nat Mater,
12, 827-835 (2013).

M. Sathiya, K. Ramesha, G. Rousse, D. Foix, D. Gonbeau, A. S. Prakash, M. L. Doublet, K. Hemalatha, J.-M. Tarascon, Chem Mater
25, 1121-1131 (2013).

M. Sathiya, A. M. Abakumov, K. Ramesha, D. Foix, G. Rousse, C. P. Laisa, D. Gonbeau, M. L. Doublet, A. S. prakash, G, van Tendeloo, J-M. Tarascon, Manuscript submitted (Nature Materials)
Invited Presentation: Advances in Li/S Batteries
Authors: Hassoun Jusef , Agostini Marco , Sun Y-K. , Scrosati Bruno 
Published: February 2020

The recent progresses of the lithium sulfur battery, both in terms of stability, energy density and cycling life, triggered increasing interest of the scientific community and of the battery manufacturers, particularly in view of its possible use as the energy storage system for electric vehicles.[1] It is, in fact, expected that the sulfur battery may be in the next few years the “high-energy” system of choice for EVs and for storage in renewable-energy plants. The several issues associated with the lithium sulfur battery, including i) electrode dissolution and volume variation, ii) high cell polarization, iii) insulating nature of the electrode and iv) polysulfide shuttle effect, have been recently addressed by adopting innovative solutions leading to enhancement of the electrochemical behavior. Among the various improvements, a crucial role has been played by composite sulfur-carbon electrodes, having “ad-hoc” structures designed to increase the sulfur utilization ad to buffer its volume variation.[2] A relevant approach to avoid the polysulfide shuttle reactions is the employment of additive salts in the electrolyte solution acting as the anode-film forming agent [3]. Recently, the use of solution containing dissolved polysulfide has been proposed as an effective way to physically and electrochemically buffer the sulfur cathode dissolution.[4] Even more attracting has been the use of dissolved polysulfide as the cathode in a semi-liquid cell configuration, in which the electrochemical process evolves in the electrolyte solution [5]. In this presentation, we report an overview of the most recent attempts employed to make the “lithium-sulfur” system suitable for application as new energy storage system of interest in the emerging green-technology field.
[1] B. Scrosati, J. Hassoun, Y- K. Sun, Energy Environ. Sci. 2011, 4, 3287
[2] J-H. Kim, D-J. Lee, H-G. Jung, Y-K. Sun, J. Hassoun, B. Scrosati, Adv. Funct. Mater. 2013, 23, 1076
[3] D. Aurbach, E. Pollak, R. Elazari, G. Salitra, C.S. Kelley, J. Affinito, J. of the Electrochem. Soc. 2009, 156, A694
[4] D.-J. Lee, M. Agostini, J.-W. Park, Y.-K. Sun, J. Hassoun, B. Scrosati, ChemSusChem 2013, 6, 2245 – 2248
[5] Y. Yang, G. Zheng, Y. Cui, Energy Environ. Sci., 2013, 6, 1552
Invited Presentation: Progress in Redox Composite Cathode for Lithium Rechargeable Batteries
Authors: Kang Kisuk 
Published: February 2020

Only a small number of Li-containing cathode material groups have been considered for practical use in Li-ion battery systems. The constraints for cathode material design such as open anion framework and Li-containing conditions restrict the choices of materials for this use. Thus, until now, candidates of positive electrode were limited to crystals that contain both redox-active element (usually transition-metal) and lithium ion in the open framework with few exceptions. To expand the sight for seeking new positive electrode material, we recently suggested a novel strategy to use Li-free transition metal ionic compounds (MX, M = transition metal, X = anion or polyanion group) as a positive electrode material by blending with a simple Li ionic compound (LiY, Y = anion or polyanion group) in nanoscale for Li-ion batteries [1]. In this nanocomposite electrode, MX provided a redox couple for an electrochemical reaction, while Li ions were supplied from LiY.
In this talk, we present our recent progress in this concept of new electrode design.
Reference
[1] Energy Storage in Composites of a Redox Couple Host and a Lithium Ion Host, Kim et. al, Nano Today, Vol 7, pp. 168-173 (2012)
Invited Presentation: 4.7 V Li-ion cells: Nonsense or Possibility
Authors: Dahn Jeff , Downie Laura , Wang D. Y. , Aiken Connor , Ma Lin , Petibon Remi , Burns John Chris , Xia Jian , Camardese John , Li Sirong 
Published: February 2020

One way to improve the energy density of Li-ion cells is to use high voltage positive electrode materials like LiNi0.5Mn1.5O4 [LNMO] or simply increase the upper cutoff potential when positive electrodes like Li[NixMnxCo1-2x]O2 [NMC] are used. This sounds simple, but there are numerous problems to overcome before high voltage Li-ion cells are a reality.
Many literature reports of Li/LNMO and LTO/LNMO cells present very promising behavior. However, most of the reports show charge discharge cycling at high rates, where many cycles can be accumulated in a short period of time. In such experiments, authors are able to “beat the clock” on parasitic electrolyte oxidation reactions which occur in cells. We recently showed using storage experiments on LTO/LNMO cells that electrolyte oxidation, as evidenced by rapid self discharge, is a huge problem [1, 2] that is ignored in most literature reports.
In this paper we discuss a number of the problems that occur in LTO/LNMO cells and high voltage graphite/NMC cells. These include:
1. Impedance increase at the positive electrode as the potential increases due to parasitic reactions.
2. Increases in parasitic heat as a function of cell voltage as measured using isothermal battery microcalorimetry
3. Increases in gas evolution as a function of cell potential, even when fluorinated solvents are used.
4. Decreases in coulombic efficiency as cell potentials increase.
5. Etc.
The results above paint a bleak picture about the future of Li-ion cells that can operate at 4.7 V.
Next, partial solutions to the problems above will be presented:
a) Electrolyte additives that can stabilize positive electrode impedance increases during high potential cycling will be discussed.
b) Electrolyte additives that can dramatically reduce parasitic heats evolved at high potentials will be discussed.
c) Materials that can dramatically lower electrolyte oxidation reactions at the surface of the positive electrode and are suitable as “shells” in core-shell materials will be discussed.
d) Electrolyte additives that can reduce gas evolution at high potential will be discussed.
e) Etc.
These encouraging results provide hope that real solutions can be found.
Iron Cyanides As a Cathode Material for Lithium-Ion Batteries
Authors: Shen Lian , Wang Zhaoxiang 
Published: February 2020

Lithium ion battery is one of the most popular power sources for clean and efficient electrochemical energy storage and conversion. There are increasing interests for both the cathode and anode, in accordance with the development of portable electronic equipments, and automotive industry. As one of the potential alternatives, organic cathode1has advantages of low cost, environmentally friendly, easy fabrication compared to the inorganic cathodes. However, the low voltage plateau and poor cycle performance restrict its applications.
Iron cyanide and its analogs2
have been pursued as attractive materials for fundamental research and large scale industrial applications since its electrochemical activity was first reported in 1978. These zeolite-like compounds have perfectly 3D polymeric frameworks due to the asymmetric CºN anion. Its large open spaces can not only accommodate transition metal ions but also some small molecules. Redox reaction can also take place there thanks to the iron valence state for charge balance. These characteristics exactly offer the tunnels and spaces for the transport and storage of lithium ions.
Fe4[Fe(CN)6]33
is the foretype of prussian blue, its theoretical specific capacity is about 100 mAh/g with one charge transport of Fe2+/Fe3+. Here we synthesize this compound by a simple one-step precipitation method. The cell shows an initial specific capacity of 95.1 mAh/g and about 75% of its original capacity is retained after 50 cycles. In order to increase the specific capacity, Fe2+
was replaced with Fe3+ to provide more redox active sites. The as-prepared FeFe(CN)6 has a regular cubic structure with the particle size of 50 nm. Two redox peaks at 2.88V/3.19V and 3.81V/3.91V are observed by cyclic voltammetry, corresponding to the oxidation/reduction of the low spin Fe2+/Fe3+ adjacent to the carbon and the high-spin of Fe2+/Fe3+bonding to the nitrogen, respectively. Galvanostatic charge/discharge cycling shows that its initial discharge capacity is 137.3 mAh/g, and the capacity retention is 60% after 100 cycles. In addition, its rate performance is very excellent.
1. Y. Liang, Z. Tao and J. Chen, Advanced Energy Materials, 2012, 742-769.
2. A. A. Karyakin, Electroanalysis, 2001, 13, 813-819.
3. N. Imanishi, T. Morikawa, J. Kondo, R. Yamane, Y. Takeda, O. Yamamoto, H. Sakaebe and M. Tabuchi, J Power Sources, 1999, 81, 530-534.
One Pot Synthesis and Characterizations of Nanosize Lithium Metal Silicates and Lithium Metal Flurophosphates for Lithium Ion Battery Applications
Authors: Devaraju Murukanahally Kempaiah , Truong Quang Duc , Honma Itaru 
Published: February 2020

Recently, orthosilicates and flurophosphates have been investigating for the cathode applications in lithium ion battery. Orthoslicate materials are built of abundant elements such as Si, Fe and Mn, which makes them cheap cathode materials for large scale high capacity batteries that can operate at higher temperatures1,2. Fluorophosphates have been considered as potential lithium insertion/ extraction cathodes3,4. Both, silicates and fluorophosphates have the ability of delivering two lithium ion discharge capacity (290-333 mAhg-1).
Herein, we present a supercritical fluid process to synthesize Li2MSiO4 and Li2MPO4F (M= Fe, Mn and Co) nanoparticles ranging from 5-50 nm and their electrode properties have been investigated. These cathode materials are synthesized via supercritical fluid process by controlling the size and shape. The supercritical synthesis was carried out at 300-450 oC for 5 min-30 min of reaction time using mixed solution of water, ethanol, EG as solvents and ascorbic acid, oleic acid and oleylamine as surfactants. The as-synthesized Li2MSiO4 and Li2MPO4F (M= Fe, Mn and Co) nanoparticles were characterized by XRD, TEM, TG-DTA and FTIR analysis. Further, the electrochemical property of Li2MSiO4 and Li2MPO4F (M= Fe, Mn and Co) cathode materials have been investigated by galvanostatic charge-discharge method.
Fig. 1 shows the TEM images of Li2FeSiO4 and Li2FePO4F nanoparticles synthesized by supercritical method at 300-450 oC for 5-30 min. The particles exhibited 5-50 nm in diameter with sphere like morphology. The different kind of morphology with variable size can be synthesized at supercritical conditions. The flower like morphology, rod like morphology and ultrafine particles were successfully synthesized and their electrochemical property was investigated. The charge-discharge curve of carbon coated Li2FeSiO4 and Li2FePO4F nanoparticles showed 180 mAhg-1 and 150 mAhg-1, respectively at 0.05C as shown in fig 1.
References
1) A. Nyten, et al. Electrochem.Commun., 2005, 7, 156.2) Y.X. Li, et al. J. Power Sources. 2007, 174, 528. 3) R. Dominko,.et al, J. Electrochem. Commun., 2006, 8, 217. 4) B.L. Ellis, et al. Nature Mater., 2007, 6, 749.
Fig.1 TEM image and charge discharge profile of Li2FeSiO4 and Li2FePO4F cathode nanomaterials
Study of Antisite Defects in LiCoPO4 Cathode Material and Their Change during Initial Charge/Discharge Cycle
Authors: Truong Quang Duc , Devaraju Murukanahally Kempaiah , Honma Itaru 
Published: February 2020

Antisite cation exchange is the typical point defects in crystal lattices which have been the topic of extraordinary research interest in solid state physics and chemistry. The optical properties, electrical conductivity, ionic diffusion and resulting chemical properties, mass and charge transport behavior of the materials are heavily affected by the concentration and distribution of these defects in the crystal lattices, which has triggered considerable efforts in the control the exchange disorder to provide optimal performance in devices.
In lithium intercalation compounds, the lithium diffusion along the channel is highly anisotropic which is strongly depend on the cation ordering within the crystal lattices. The cation exchange disorder, namely the occupation of Li sites by transition metals, inevitably blocks the lithium ion diffusion pathway, thus directly affects the cathode performance in lithium-ion batteries. It has been clearly confirmed the presence of antisite defect in lithium-intercalated transition-metal oxides and phosphates by theoretical calculations, neutron diffraction and direct observation by advanced electron microscopy. It now turns to research on the local variations, transition metal relocation, structural change and their correlation to the voltage/capacity fading during the charge/discharge cycling. Many intensive investigation on the diffusion of transition metal ions on the layered metal oxides during the cycling process. However, the relocation of metal ions in ordered lithium metal phosphates during the intercalation-deintercalation reactions, remains unknown, although this relocation undoubtedly influence mass and charge transport behavior.
In this presentation, by a combination of high-angle annular dark-field (HAADF) and annular bright-field (ABF) STEM, we observed the local variation of cobalt ions from M2 sites to vacancy M1 sites in olivine lithium cobalt phosphates upon the delithiation process (Ref. 1). The finding provides the intrinsic evidence for the capacity fading of LiCoPO4 cathode materials.
1. Truong, Q. D., Devaraju, M. K., Tomai, T. & Honma, I. Direct observation of antisite defects in LiCoPO4 cathode materials by annular dark- and bright-field electron microscopy. ACS Appl. Mater. Interfaces 5, 9926−9932 (2013).
A Zero-Strain P2-Layered Na0.66[Li0.22Ti0.78]O2 As New Anode Material for Room-Temperature Sodium-Ion Batteries
Authors: Wang Yuesheng , Yu Xiqian , Xu Shuyin , Bai Jianming , Xiao Ruijuan , Hu Yong-Sheng , Li Hong , Yang Xiaoqing , Chen Liquan , Huang Xuejie 
Published: February 2020

Room-temperature sodium storage technology has attracted more and more interest in the electrical energy storage field, particularly for large-scale applications in renewable solar and wind power as well as smart grid. However, the development of suitable anode materials remains a big challenging issue for long-life sodium-ion batteries.
In this presentation, we will introduce a new “zero-strain” anode, Na0.66[Li0.22Ti0.78]O2 with P2-layered structure, as a promising material for room-temperature long-life sodium-ion batteries. There are several significantly important results obtained in this work: the reversible capacity is ca. 110 mAh/g; the average sodium storage voltage is ca. 0.75 V; the volume change during sodium insertion and extraction is only 0.77%, showing the “zero-strain” characteristics; the material exhibits very long cycling performance, over 1200 cycles with a capacity retention of 75%; the measured apparent Na+ ion diffusion coefficient is ca. 1x10-10 cm2/s. It is also very interesting to find that the final discharge product is actually a mixture of several phases which also retain the P2-structure confirmed by in situ and ex situXRD. The difference in these several P2-phases lies in different sodium composition and occupation (2b, 2d) in the alkali layer.
This contribution demonstrates that P2-Na0.66[Li0.22Ti0.78]O2is a promising anode material for the development of rechargeable long-life sodium-ion batteries.

References:

[1] Y. S. Wang, X. Q. Yu, S. Y. Xu, J. M. Bai, R. J. Xiao, Y.-S. Hu, H. Li, X.-Q. Yang, L. Q. Chen, X. J. Huang,
Nat. Commun.
2013, 4, 2365.
[2] H. L. Pan, Y.-S. Hu, L. Q. Chen,
Energy &Environ. Sci.
2013, 6, 2338-2360.

Figure 1
a) P2-structure, b) Na+ ion diffusion, c) Volume change, d) Discharge/charge curves, e) Cycling performance, f) XRD refinement of final discharged product
Nanostructured Anatase TiO2 - from Lithium- to Sodium-Ion Anodes
Authors: Bresser Dominic , Wu Liming , Oschmann Bernd , Mueller Franziska , Buchholz Daniel , Tahir Muhammad Nawaz , Tremel Wolfgang , Zentel Rudolf , Passerini Stefano 
Published: February 2020

Lithium-ion batteries are nowadays the energy storage device of choice for portable electronic devices due to their superior energy and power density. Consequently, they are considered also as most promising power source for large-scale applications as, for instance, electric vehicles [1–3]. However, for such applications further improvement of the existing technology is required in terms of energy, power, and particularly safety. Beside Li4Ti5O12, which is already used in commercial cells, anatase TiO2 – particularly in its nanostructured form - is seriously considered as alternative anode material to replace graphite due to its enhanced safety and rate capability [4,5].
Remarkably, anatase TiO2 was recently demonstrated to be highly promising as high power anode material for sodium-ion batteries [6,7], which are considered as low-cost alternative for lithium-ion batteries. These batteries are especially interesting for stationary energy storage applications in order to balance the energy supply provided by renewables, for which size and weight are less important, while cost are of major importance.
Herein we will report our latest results on the utilization of nanostructured anatase TiO2 for lithium- and sodium-ion batteries, including the importance of carbonaceous coatings and percolating networks, and highlight the major differences regarding the lithium- and sodium-ion storage mechanism.

References

[1] M. Armand, J.-M. Tarascon, Nature 451 (2008) 652.
[2] B. Scrosati, J. Garche, J. Power Sources 195 (2010) 2419.
[3] B. Scrosati, J. Hassoun, Y.-K. Sun, Energy Environ. Sci. 4 (2011) 3287.
[4] C. Jiang, J. Zhang, J. Mater. Sci. Technol. 29 (2013) 97.
[5] D. Bresser, E. Paillard, E. Binetti, S. Krueger, M. Striccoli, M. Winter, S. Passerini, J. Power Sources 206 (2012) 301.
[6] Y. Xu, E. Memarzadeh Lotfabad, H. Wang, B. Farbod, Z. Xu, A. Kohandehghan, D. Mitlin, Chem. Commun. 49 (2013) 8973.
[7] L. Wu, D. Buchholz, D. Bresser, L. Gomes Chagas, S. Passerini, J. Power Sources 251 (2014) 379.
Synthesis and Characterization of Nanoporous NaMn2O4 electrode Material for Sodium-Ion Battery
Authors: Wei Yiying , Chen Shuangqiang , Wang Guoxiu , Zhu Jianguo 
Published: February 2020

Lithium is relative expensive and will be exhaust one day due to the limitation of lithium resources on the earth. In contrast to lithium, sodium is more abundant and lower cost of sodium-containing precursors, leading to sodium-ion battery is a promising energy storage device for large-scale systems. 1-3

In the present work, we synthesized NaMn2O4 spheres with mesoporous structure via a revised microwave assisted high temperature solid-state reaction. As shown in Fig. 1a, the powders consist of plurality of NaMn2O4 spheres, ranging from 2 um to 5 um. The high magnification SEM image shows that the materials possess mesopores with the diameter around 20 nm. The uniform mesoporous structure optimizes the sodium ion diffusion path, and facilitates the transportation of ions. The electrochemical performances of the nanoporous NaMn2O4were investigated as the electrodes for sodium-ion battery. The three cycles of consecutive cyclic voltammogram (CV) at a scan rate of 0.1 mV/s are shown in Fig. 1c. The CV curve reveals the materials have excellent reversibility. It has five cathodic redox peaks at around 2.4 V, 2.5 V, 2.85 V, 3.47 V and 4.17 V in the voltage range 2.0 V to 4.5V, respectively, indicating the multi-step insertion of the sodium ion into NaMn2O4 nanostructures. Five anodic peaks were also observed at around 2.35 V, 2.6 V, 3.2 V, 3.5 V and 4.25 V are ascribed to the sodium ion deintercalation process, respectively. The five pairs of redox peaks demonstrate the excellent reverse capability of the materials. Furthermore, there are a bit of shifts with the increase of the cycles, leading to good cyclability.
References
1. M. D. Slater, D. Kim, E. Lee and C. S. Johnson, Advanced Functional Materials, 2013, 23, 947-958.
2. S. Wenzel, T. Hara, J. Janek and P. Adelhelm, Energy & Environmental Science, 2011, 4, 3342-3345.
3. A. Darwiche, C. Marino, M. T. Sougrati, B. Fraisse, L. Stievano and L. Monconduit, Journal of the American Chemical Society, 2012, 134, 20805-20811.