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Nano Research

Article Title

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

Authors

Guobin Zhang, 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
Tengfei Xiong, 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
Xuelei Pan, 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
Yunlong Zhao, Advanced Technology Institute, University of Surrey, Guildford GU2 7XH, UK National Physical Laboratory, Teddington TW11 0LW, UK
Mengyu Yan, Materials Science and Engineering Department, University of Washington, Seattle, WA 98195-2120, USA
Haining Zhang, 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
Buke Wu, 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
Kangning Zhao, 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
Liqiang Mai, 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

Keywords

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

Abstract

Subtle structural changes during electrochemical processes often relate to the degradation of electrode materials. Characterizing the minutevariations 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.

Graphical Abstract

Publisher

Tsinghua University Press

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