Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy

doi:10.1088/1674-1056/27/10/107802

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 L_2,3-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.

Keywords: soft x-ray absorption LiCoO₂ charge compensation capacity degradation

Received: 17 May 2018
Revised: 03 July 2018
Accepted manuscript online:

PACS:	78.70.Dm	(X-ray absorption spectra)
	82.47.Aa	(Lithium-ion batteries)
	82.30.-b	(Specific chemical reactions; reaction mechanisms)

Fund:

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

Corresponding Authors: Peng-Fei Yu
E-mail: ypfaq@mail.sim.ac.cn

Cite this article:

Xing-Hui Long(龙兴辉), Yan-Ru Wu(吴颜如), Nian Zhang(张念), Peng-Fei Yu(于鹏飞), Xue-Fei Feng(冯雪飞), Shun Zheng(郑顺), Jia-Min Fu(傅佳敏), Xiao-Song Liu(刘啸嵩), Na Liu(柳娜), Meng Wang(王梦), Lei-Min Xu(徐磊敏), Jin-Ming Chen(陈锦明), Jenn-Min Lee(李振民) Charge compensation and capacity fading in LiCoO₂ at high voltage investigated by soft x-ray absorption spectroscopy 2018 Chin. Phys. B 27 107802

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Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy

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Charge compensation and capacity fading in LiCoO₂ at high voltage investigated by soft x-ray absorption spectroscopy