Insight into cobalt-doping in Li2FeSiO4 cathode material for lithium-ion battery

	Insight into cobalt-doping in Li2FeSiO4 cathode material for lithium-ion battery
	Zhang, LL; Duan, S; Yang, XL; Liang, G; Huan, YH; Cao, XZ; Yang, J; Li, M; Croft, MC; Lewis, C
刊名	JOURNAL OF POWER SOURCES
	2015
卷号	274 页码:194-202
关键词	Lithium ion battery Cathode Lithium iron silicate Cobalt-doping
英文摘要	This study presents the preparation and electrochemical performance of cobalt-doped Li2FeSiO4/C (Codoped LFS/C) composite by using a solid-state reaction assisted with refluxing process. The Co-doped LFS/C composite delivers a higher discharge capacity of 142.5 mAh g(-1) at 3.0 C even after 100 cycles compared with pristine LFS/C. A clear feature of cobalt-doping in Li2FeSiO4 has been specified by X-ray powder diffraction, X-ray photoelectron spectroscopy coupled with Ar-ion sputtering, X-ray absorption spectroscopy, and positron annihilation lifetime spectroscopy. It is confirmed that Co has been successfully doped into the lattice of LFS, and Co-doping does not change the monoclinic structure of LFS and the oxidation state of Fe. Positron annihilation lifetime spectroscopy analysis further demonstrates that Co-doping increases the defect concentration and the electronic conductivity of LFS. The results clarify the nature of cobalt-doping in LFS and are helpful for understanding the enhancement mechanism of the electrochemical performance of LFS and other cathode materials. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	Electrochemistry; Energy & Fuels
类目[WOS]	Electrochemistry ; Energy & Fuels
收录类别	SCI
WOS记录号	WOS:000347268700025
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228142]
专题	高能物理研究所_多学科研究中心
推荐引用方式 GB/T 7714	Zhang, LL,Duan, S,Yang, XL,et al. Insight into cobalt-doping in Li2FeSiO4 cathode material for lithium-ion battery[J]. JOURNAL OF POWER SOURCES,2015,274:194-202.
APA	Zhang, LL.,Duan, S.,Yang, XL.,Liang, G.,Huan, YH.,...&杨静.(2015).Insight into cobalt-doping in Li2FeSiO4 cathode material for lithium-ion battery.JOURNAL OF POWER SOURCES,274,194-202.
MLA	Zhang, LL,et al."Insight into cobalt-doping in Li2FeSiO4 cathode material for lithium-ion battery".JOURNAL OF POWER SOURCES 274(2015):194-202.