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Subtle structural changes during electrochemical processes often relate to the degradation of electrode materials. Characterizing the minute-variations in complementary aspects such as crystal structure, chemical bonds, and electron/ion conductivity will give an in-depth understanding on the reaction mechanism of electrode materials, as well as revealing pathways for optimization. Here, vanadium pentoxide (V2O5), a typical cathode material suffering from severe capacity decay during cycling, is characterized by in-situ X-ray diffraction (XRD) and in-situ Raman spectroscopy combined with electrochemical tests. The phase transitions of V2O5 within the 0–1 Li/V ratio are characterized in detail. The V–O and V–V distances became more extended and shrank compared to the original ones after charge/discharge process, respectively. Combined with electrochemical tests, these variations are vital to the crystal structure cracking, which is linked with capacity fading. This work demonstrates that chemical bond changes between the transition metal and oxygen upon cycling serve as the origin of the capacity fading.


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Illumining phase transformation dynamics of vanadium oxide cathode by multimodal techniques under operando conditions

Show Author's information Guobin Zhang1,§Tengfei Xiong1,§Xuelei Pan1Yunlong Zhao2,3( )Mengyu Yan4( )Haining Zhang1Buke Wu1Kangning Zhao1Liqiang Mai1( )
State Key Laboratory of Advanced Technology for Materials,Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology,Wuhan,430070,China;
Advanced Technology Institute,University of Surrey,Guildford,GU2 7XH,UK;
National Physical Laboratory,Teddington,TW11 0LW,UK;
Materials Science and Engineering Department,University of Washington,Seattle,WA 98195-2120,UK;

§ Guobin Zhang and Tengfei Xiong contributed equally to this work.

Abstract

Subtle structural changes during electrochemical processes often relate to the degradation of electrode materials. Characterizing the minute-variations in complementary aspects such as crystal structure, chemical bonds, and electron/ion conductivity will give an in-depth understanding on the reaction mechanism of electrode materials, as well as revealing pathways for optimization. Here, vanadium pentoxide (V2O5), a typical cathode material suffering from severe capacity decay during cycling, is characterized by in-situ X-ray diffraction (XRD) and in-situ Raman spectroscopy combined with electrochemical tests. The phase transitions of V2O5 within the 0–1 Li/V ratio are characterized in detail. The V–O and V–V distances became more extended and shrank compared to the original ones after charge/discharge process, respectively. Combined with electrochemical tests, these variations are vital to the crystal structure cracking, which is linked with capacity fading. This work demonstrates that chemical bond changes between the transition metal and oxygen upon cycling serve as the origin of the capacity fading.

Keywords: phase transformation, in-situ X-ray diffraction (XRD), in-situ Raman, electrochemical process

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Received: 08 November 2018
Revised: 21 January 2019
Accepted: 29 January 2019
Published: 12 March 2019
Issue date: April 2019

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© The Authors(s) 2019

Acknowledgements

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Nos. 51425204, 51832004, 51872218, 51521001, 21805219, and 51302203), the National Key Research and Development Program of China (No. 2016YFA0202603), the Programme of Introducing Talents of Discipline to Universities (No. B17034), the Yellow Crane Talent (Science & Technology) Program of Wuhan City, the project of innovative group for low cost and long cycle life Na-ion batteries R & D and Industrialization of Guangdong Province (No. 2014ZT05N013) and the Fundamental Research Funds for the Central Universities (WUT: 2017-YB-005, 2017IVA100, 2017IVA096, 2017III040). The μ-XRF beam time is granted by 4W1B endstation of Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences. The staff members of 4W1B are acknowledged for their support in measurements and data reduction. Dr. Yunlong Zhao thanks Advanced Technology Institute at University of Surrey and the UK National Measurement System. Guobin Zhang and Prof. Liqiang Mai thank Prof. Yan Zhao for the discussion.

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