中国物理学会期刊网
Chin.Phys.B  2018, Vol.27 Issue (10): 107802  DOI:10.1088/1674-1056/27/10/107802
Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy
1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;2 Center for Excellence in Superconducting Electronics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;3 University of Chinese Academy of Sciences, Beijing 100049, China;4 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;5 School of Physical Science and Technology, Shanghai Tech University, Shanghai 200031, China;6 NingDe Amperex Technology Limited, Ningde 352100, China;7 "National" Synchrotron Radiation Research Centre, Hsinchu 30076, Taiwan, China>

Abstract

In order to obtain an in-depth insight into the mechanism of charge compensation and capacity fading in LiCoO2, the evolution of electronic structure of LiCoO2 at different cutoff voltages and after different cycles are studied by soft x-ray absorption spectroscopy in total electron (TEY) and fluorescence (TFY) detection modes, which provide surface and bulk information, respectively. The spectra of Co L2,3-edge indicate that Co contributes to charge compensation below 4.4 V. Combining with the spectra of O K-edge, it manifests that only O contributes to electron compensation above 4.4 V with the formation of local O 2p holes both on the surface and in the bulk, where the surficial O evolves more remarkably. The evolution of the O 2p holes gives an explanation to the origin of O2- or even O2. A comparison between the TEY and TFY of O K-edge spectra of LiCoO2 cycled in a range from 3 V to 4.6 V indicates both the structural change in the bulk and aggregation of lithium salts on the electrode surface are responsible for the capacity fading. However, the latter is found to play a more important role after many cycles.
收稿日期:2018-05-17

基金资助

Project supported by the National Natural Science Foundation of China (Grant Nos. 21503263, U1632269, 21473235, and 11227902).

引用本文

[英文]
Xing-Hui Long, Yan-Ru Wu, Nian Zhang, Peng-Fei Yu, Xue-Fei Feng, Shun Zheng, Jia-Min Fu, Xiao-Song Liu, Na Liu, Meng Wang, Lei-Min Xu, Jin-Ming Chen, Jenn-Min Lee. Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy[J]. Chin. Phys. B, 2018, 27(10): 107802.
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