Search query: WO3 coating cathode

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abstract: Abstract Inspired by the WO3 transition metal semiconductor, a simple liquid phase WO3 coating strategy is introduced to improve the surface stability of LiNi0.5Co0.2Mn0.3O2. The electrochemical performance of WO3 coated LiNi0.5Co0.2Mn0.3O2 is improved at both a high cut off voltage (4.5 V) and high temperature (50 degC) With the WO3 (0.6 wt% coating amount optimized, the material capacity retention is maintained at 138 mAh g 1 and 170.9 mAh g 1 at 25 degC and 50 degC after 200 cycles compared with 107.8 mAh g 1 and 143.9 mAh g 1, respectively, for pristine NCM523. The WO3 coated sample also exhibits a better rate capability, maintaining 126 mAh g 1 at 25 degC in the voltage range of 3 4.5 V at the current density of 5 C. The enhanced properties of the WO3 coated LiNi0.5Co0.2Mn0.3O2 due to the WO3 coating layer result from the interface that prevents immediate contact between the electrolyte and the active material as well as the lower polarization and electrochemical resistance of the battery. SEM, TEM, XPS and EIS further reveal these improved electrochemical performances, which indicate the success of the approach for regenerating NCM523.
author_names: Yulin He

Yingtao Li

Yaochun Liu

Nianchun Yao

Jiamei Li

Yang Liu
title: Enhancement of the high voltage electrochemical performance of an LiNi0.5Co0.2Mn0.3O2 cathode via WO3 coating
year: 2020

abstract: LiNi0.8Co0.1Mn0.1O2 cathode material was successfully modified by using a wet chemical route to coat WO3. The microstructures, morphologies, crystal structures, elemental distributions and ionic valence of the prepared cathode materials were carefully analyzed by SEM, EDS, TEM, HRTEM, XRD and XPS. The results indicated that the surface of LiNi0.8Co0.1Mn0.1O2 was uniformly covered by WO3 particles, and a small amount of W could enter to the lattice of LiNi0.8Co0.1Mn0.1O2. The WO3 coating could prohibit the corrosion of HF and some side reactions for the cathode material during long cycles, thus greatly improving the electrochemical performance and the structural stability of LiNi0.8Co0.1Mn0.1O2. Among the examined LiNi0.8Co0.1Mn0.1O2 cathode materials, 1.0 wt% WO3 coated LiNi0.8Co0.1Mn0.1O2 has the best initial discharge capacity (185.1 mAh g and an excellent capacity retention (93.2% after 100 cycles at 1 C.
author_names: C Xiong
title: Enhanced Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 Cathode Material for lithium ion batteries by WO3 surface coating
year: 2020

abstract: Surface coating and ion doping are of great significance for improving the electrochemical performance of cathode materials for lithium ion batteries. In this study, WO3 coated and Mg2+ doped LiNi0.8Co0.1Mn0.1O2 cathode materials were successfully synthesised by the coprecipitation and wet coating methods. X ray diffraction and energy dispersive X ray spectroscopy confirmed that the synthesised material was NCM811 with a good layered structure and Mg2+ doped into it. X ray photoelectron spectroscopy revealed that W6+ mainly existed on the surface of the material, while morphological analysis revealed a uniform WO3 coating on the material surface. Electrochemical performance of the material suggested that the modification by suitable materials synergistically stabilised the material structure and suppressed side reactions. Capacity retention of the dual modified material at 25 degC after 100 cycles at 1 C rate was as high as 73.5% which is considerably higher than that of the raw materials (53.6%
author_names: Zhongliang Xiao

Chengfeng Zhou

Zhong Cao

Peng Jiang
title: Dual modification of WO3 coating and Mg doping on LiNi0.8Co0.1Mn0.1O2 cathodes for enhanced electrochemical performance at high voltage
venue: Ionics
year: 2021

abstract: Abstract The g WO3/Li2WO4 composite coated and spinel embedded Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode is successfully synthesized via a simple wet coating process. A series of synthesized materials were characterized by X ray diffraction (XRD) field emission scanning electron microscopy (FE SEM) high resolution transmission electron microscope (HR TEM) Raman and X ray photoelectron spectroscopy (XPS) g WO3/Li2WO4 composite layer was successfully coated on the surface of Li rich Mn based materials and the spinel structure was also formed during the modification process. Charge discharge measurements indicate that the modified samples show an enhanced cyclic properties and rate capability. After the modification process, the initial coulombic efficiency increased to 89.3% for 7 wt W composite coated sample with the lowest capacity loss of 33.5 mAh g 1. Particularly, 5 wt W composite coated sample shows the best capacity retention of 88.0% at 100 mA g 1 with the discharge capacity of 233.5 mAh g 1 and excellent rate capability with the discharge capacity of 173.0 mAh g 1 at 800 mA g 1. The improvements in electrochemical properties and structural stability were mainly due to both g WO3/Li2WO4 coating layer and the spinel phase formed during the modification.
author_names: Fanbo Meng

Huajun Guo

Zhixing Wang

Guochun Yan

Xinhai Li
title: Modification by simultaneously g WO3/Li2WO4 composite coating and spinel structure formation on Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode via a simple wet process
venue: Journal of Alloys and Compounds
year: 2019

abstract: Abstract Nano sized TiO 2 /WO 3 bilayer coatings were prepared on type 304 stainless steel substrate by sol gel method. The performance of photo electrochemical and photogenerated cathode protection of the coating was investigated by the electrochemical method. The results show that the bilayer coating with four TiO 2 layers and three WO 3 layers exhibits the highest photo electrochemical efficiency and the best corrosion resistance property. Type 304 stainless steel with the coating can maintain cathode protection for 6 h in the dark after irradiation by UV illumination for 1 h. In addition, the mechanism of the photogenerated cathode protection for the bilayer coating was also explored.
author_names: Min-jie Zhou

Zhenou Zeng

Li Zhong
title: Photogenerated cathode protection properties of nano sized TiO2/WO3 coating
year: 2009

abstract: Abstract Despite Nickel rich materials have all the advantages of high capacity, long cycle life and low cost, there is still a disadvantage that the capacity decreases rapidly as the number of cycles increases. In order to solve this problem, WO3 was uniformly coated on the surface of LiNi0.6Co0.2Mn0.2O2 cathode materials by wet coating, and its cycling performance was greatly improved with the higher capacity. The coated materials were analyzed by X ray diffraction(XRD) Scanning electron microscope (SEM) high resolution Transmission electron microscopy (TEM) and X ray photoelectron spectroscopy(XPS) The results showed that the coating thickness was around 3.15 nm, and some tungsten ions were doped into the lattice of the near surface area of the LiNi0.6Co0.2Mn0.2O2 material. In addition, the results of charge discharge test showed that 1 wt%WO3 coating LiNi0.6Co0.2Mn0.2O2 had the best performance, and delivered a discharge capacity of 140 mAh g 1 (the capacity retention rate is 84.8% in the potential interval of 2.8 4.3 V at 1 C (1 C 165 mA g 1) after 200 cycles, while the bare cathode material only delivered a discharge capacity of 120 mAhg 1 (the capacity retention rate is 75% The phenomenon indicates that the WO3 coating plays a role in inhibiting the harmful side reactions between the cathode material and the electrolyte, improving the electrochemical and structure stability of LiNi0.6Co0.2Mn0.2O2 cathode materials.
author_names: Guowen Song

Hui Zhong

Yanyang Dai

Xiangyang Zhou

Juan-Yu Yang
title: WO3 membrane encapsulated layered LiNi0.6Co0.2Mn0.2O2 cathode material for advanced Li ion batteries
venue: Ceramics International
year: 2019

abstract: Abstract WO3 coated Li1.2Ni0.2Mn0.6O2 cathode materials have been synthesized by using co precipitation method along with a liquid evaporation coating process. Investigations via X ray diffraction (XRD) scanning electron microscopy (SEM) transmission electron microscopy (TEM) and X ray photoelectron spectroscopy (XPS) reveal that a WO3 layer is uniformly distributed on the surface of bulk Li1.2Ni0.2Mn0.6O2. After coating appropriate amount of WO3, the Li rich cathode materials exhibit improved electrochemical performance. In particular, the 2 wt% WO3 coated sample (WO3 0.02 LLNMO) can deliver an initial discharge capacity of 252.2 mA h g 1 with a low irreversible capacity loss of 44.6 mA h g 1 and remarkable cycling stability of 97% capacity retention after 100 cycles at a current density of 52 mA g 1. This is mainly due to the effects of the WO3 coating layer which can suppress the initial activation of Li2MnO3 and improve the stability of surface structure of Li rich materials by protecting it from corrosion by HF and other side reactions.
author_names: Kunchang Mu

Yanbing Cao

Guo-rong Hu

Ke Du

Hao Yang

Zhanggen Gan

Zhong-dong Peng
title: Enhanced electrochemical performance of Li rich cathode Li1.2Ni0.2Mn0.6O2 by surface modification with WO3 for lithium ion batteries
year: 2018

abstract: Abstract This paper reports the enhancement of the electrochromic properties of a tungsten trioxide (WO3) based electrode through the synthesis of hierarchical zinc oxide (ZnO) nanobricks (ZnBs) The two step hydrothermal method and the radio frequency (RF) sputtering were used for the growth of highly conductive ZnBs and the coating of electrochromic WO3 film, respectively. Three different structures were prepared: an electrode without ZnBs, electrode with single layered and electrode with double layered ZnBs. The electrochromic properties of the electrode were improved significantly attributing to the preparation of double layered ZnBs. Compared to the electrode without ZnBs, the electrode with double layered ZnBs showed a fast response at coloring (response time reduced from 15.9 s to 12.8 s, speeding by 19.5% with an enhanced coloration efficiency (from 4.33 cm2 C 1 increasing to 18.28 cm2 C 1, improving by 4.2 fold) After repeating the redox for 2000 cycles, the peak current densities of anode and cathode were 60.3% and 52.2% respectively of their initial densities. Stable electrochromic performance of the electrode was achieved.
author_names: Su-Hua Yang

Jiahua Yang
title: Enhancement on electrochromic properties of WO3 based electrode prepared with hierarchical ZnO nanobricks
year: 2020

abstract: Abstract Lateral Programmable Metallization Cell (PMC) structures rely on metal electrodeposition in a long channel consisting of a solid electrolyte layer between an anode and a cathode. Integration of these devices with CMOS circuitry demands using materials such as copper and tungsten for the electrodes, and an oxide of tungsten (WO3) doped with Cu for the electrolyte. However, low diffusivity of Cu in WO3 and its high resistivity results in a slow electrodeposition process. Our solution to this problem involves the use of a Cu2O/Cu WO3 bilayer, formed by oxidation of a thin Cu film on a WO3 layer and a simultaneous diffusion of Cu into the WO3 at moderate temperatures. This creates a Cu WO3 solid electrolyte with a semiconducting Cu2O coating that brings electrons to where the ions are most abundant and thereby greatly increases the electrodeposition rate. In this paper, an investigation of thin film Cu oxidation is presented along with the diffusion kinetics of Cu in WO3. The Cu was oxidized in air to form Cu2O with an activation energy of 0.70 eV. The diffusion analysis showed activation energy of Cu diffusion in WO3 was 0.74 eV, which we believe is the first time this value has been reported.
author_names: Mehmet B Balaban

Ninad Chamele

S Swain

Yago Gonzalez-Velo

Michael N Kozicki
title: Fabrication and characterization of Cu2O/Cu WO3 bilayers for lateral programmable metallization cells
year: 2020

abstract: Construction of multifunctional photoelectrochemical energy devices is of great importance to energy saving. In this study, we have successfully prepared a mesoporous WO3 film on FTO glass via a facile dip coating sol gel method; the designed mesoporous WO3 film exhibited advantages including high transparency, good adhesion and high porosity. Also, multifunctional integrated energy storage and optical modulation ability are simultaneously achieved by the mesoporous WO3 film. Impressively, the mesoporous WO3 film exhibits a noticeable electrochromic energy storage performance with a large optical modulation up to 75.6% at 633 nm, accompanied by energy storage with a specific capacity of 75.3 mA h g 1. Furthermore, a full electrochromic energy storage window assembled with the mesoporous WO3 anode and PANI nanoparticle cathode is demonstrated with large optical modulation and good long term stability. Our research provides a new route to realize the coincident utilization of optical electrochemical energy.
author_names: Wei-qi Wang

Xiufang Wang

Xinhui Xia

Zhujun Yao

Yu Zhong

Jiangping Tu
title: Enhanced electrochromic and energy storage performance in mesoporous WO3 film and its application in a bi functional smart window.
venue: Nanoscale
year: 2018