Improved high rate performance and cycle stability for LiNi0.8Co0.2O2 by doping of the high valence state ion Nb5+ into Li+ sites

doi:10.1016/j.jallcom.2018.03.375

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	Improved high rate performance and cycle stability for LiNi0.8Co0.2O2 by doping of the high valence state ion Nb5+ into Li+ sites
	Kang Wu; Jia, Guofeng; Shangguan, Xuehui; Yang, Guowei; Zhu, Zenghu; Peng, Zhengjun; Qin Zhuge; Li, Faqiang; Cui, Xiaoling
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-10-15
卷号	765 页码:700-709
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2018.03.375
英文摘要	High rate performance has been a challenging issue for LiNi0.8Co0.2O2 material. Elemental doping is a very effective method that has been used to maintain the structure of cathode materials with high stability and improve the high rate performance. Encouraged by previous research and considering the shortcomings of LiNi0.8Co0.2O2, materials with a composition of Li1-xNbxNi0.8Co0.2O2 (x = 0, 0.01, 0.03) were prepared by co-precipitation and the solid phase sintering method. The structure and electrochemical performance were studied in detail. The results from structural analysis suggested that the doping element was successfully doped into LiNi0.8Co0.2O2. Electrochemical measurements suggested that high rate capacities led to distinct improvements for a moderate Nb-doping content. Specifically, the initial capacities delivered by LiNi0.8Co0.2O2 and Li0.99Nb0.01Ni0.8Co0.2O2 increased from 97 to 156 mAh/g at 25 degrees C and 62.1 to 144.7 mAh/g at 50 degrees C at a rate of 5 C. In addition, the results from differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis demonstrated that the Nb-doped LiNi0.8Co0.2O2 had a higher thermal stability in the charged state compared to the un-doped material. Therefore, the Li+ sites in LiNi0.8Co0.2O2 were partially substituted by the high valence element Nb, which can lower Li/Ni mixing and polarization, accelerate the migration rate of Li+ and stabilize the structure of the cathode material, thus improving the high rate performance and cycling stability. (C) 2018 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.isl.ac.cn/handle/363002/34492]
专题	青海盐湖研究所_盐湖资源与化学实验室
推荐引用方式 GB/T 7714	Kang Wu,Jia, Guofeng,Shangguan, Xuehui,et al. Improved high rate performance and cycle stability for LiNi0.8Co0.2O2 by doping of the high valence state ion Nb5+ into Li+ sites[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,765:700-709.
APA	Kang Wu.,Jia, Guofeng.,Shangguan, Xuehui.,Yang, Guowei.,Zhu, Zenghu.,...&Cui, Xiaoling.(2018).Improved high rate performance and cycle stability for LiNi0.8Co0.2O2 by doping of the high valence state ion Nb5+ into Li+ sites.JOURNAL OF ALLOYS AND COMPOUNDS,765,700-709.
MLA	Kang Wu,et al."Improved high rate performance and cycle stability for LiNi0.8Co0.2O2 by doping of the high valence state ion Nb5+ into Li+ sites".JOURNAL OF ALLOYS AND COMPOUNDS 765(2018):700-709.