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

	Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy
	Long, Xing-Hui 1,2,3; Wu, Yan-Ru 1,2,3; Zhang, Nian 1,2; Yu, Peng-Fei 1,2; Feng, Xue-Fei 4; Zheng, Shun 1,2,3; Fu, Jia-Min1,2,5 ; Liu, Xiao-Song1,2,5 ; Liu, Na 6; Wang, Meng 6; Xu, Lei-Min 6; Chen, Jin-Ming 7; Lee, Jenn-Min 7
	2018-10
发表期刊	CHINESE PHYSICS B (IF:1.5[JCR-2023],1.4[5-Year])
ISSN	1674-1056
卷号	27 期号:10
发表状态	已发表
DOI	10.1088/1674-1056/27/10/107802
摘要	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,L-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 O-2(-) or even O-2. 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.
关键词	soft x-ray absorption LiCoO2 charge compensation capacity degradation
收录类别	EI ; SCIE ; SCI
语种	英语
资助项目	National Natural Science Foundation of China[21503263] ; National Natural Science Foundation of China[U1632269] ; National Natural Science Foundation of China[21473235] ; National Natural Science Foundation of China[11227902]
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000459969100002
出版者	IOP PUBLISHING LTD
EI入藏号	20184405997833
EI主题词	Cobalt ; Electronic structure ; Lithium compounds ; X ray absorption spectroscopy ; X rays
EI分类号	Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Light/Optics:741.1 ; Atomic and Molecular Physics:931.3 ; High Energy Physics:932.1
WOS关键词	ELECTRONIC-STRUCTURE ; L-EDGE ; ELECTROCHEMICAL PERFORMANCE ; K-EDGE ; DEGRADATION MECHANISMS ; OXYGEN CONTRIBUTION ; CATHODE MATERIALS ; ION BATTERY ; INTERCALATION ; DEINTERCALATION
原始文献类型	Article
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/28718
专题	物质科学与技术学院_硕士生物质科学与技术学院_特聘教授组_刘啸嵩组
通讯作者	Yu, Peng-Fei
作者单位	1.Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Superconducting Elect, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA 5.Shanghai Tech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China 6.NingDe Amperex Technol Ltd, Ningde 352100, Peoples R China 7.Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Peoples R China
推荐引用方式 GB/T 7714	Long, Xing-Hui,Wu, Yan-Ru,Zhang, Nian,et al. Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy[J]. CHINESE PHYSICS B,2018,27(10).
APA	Long, Xing-Hui.,Wu, Yan-Ru.,Zhang, Nian.,Yu, Peng-Fei.,Feng, Xue-Fei.,...&Lee, Jenn-Min.(2018).Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy.CHINESE PHYSICS B,27(10).
MLA	Long, Xing-Hui,et al."Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy".CHINESE PHYSICS B 27.10(2018).