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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; Cao XZ(曹兴忠); Yang J(杨静)
2015
发表期刊JOURNAL OF POWER SOURCES
卷号274页码:194-202
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.
文章类型Article
关键词Lithium ion battery Cathode Lithium iron silicate Cobalt-doping
学科领域Electrochemistry; Energy & Fuels
DOI10.1016/j.jpowsour.2014.10.048
收录类别SCI
WOS类目Electrochemistry ; Energy & Fuels
WOS记录号WOS:000347268700025
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被引频次:26[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228142
专题多学科研究中心
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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.
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