Cupric ion substituted LiFePO4/C composites with enhanced electrochemical performance for Li-ion batteries

被引：11

作者：

Ma, Zhipeng ^{[1
]}

Fan, Yugian ^{[1
]}

Shao, Guangjie ^{[1
,2
]}

Wang, Lin ^{[1
]}

Song, Jianjun ^{[1
]}

Wang, Guiling ^{[1
]}

Liu, Tingting ^{[1
]}

机构：

[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[2] Yanshan Univ, Coll Environm & Chem Engn, Hebei Key Lab Appl Chem, Qinhuangdao 066004, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2014年 / 139卷

关键词：

Lithium iron phosphate; Cupric ion substitution; Cathode material; Lithium-ion battery; DOPED LIFEPO4/C; CATHODE MATERIALS; ELECTRODE MATERIALS; PHOSPHO-OLIVINES; LIXMPO4; M; LITHIUM; DIFFUSION; CONDUCTIVITY; TEMPERATURE; BEHAVIOR;

D O I：

10.1016/j.electacta.2014.07.030

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Cupric ion substituted LiFePO4/C composites were successfully synthesized via a two-step solid state reaction method. The SEM mapping demonstrates that cupric is well substituted in LiFePO4. Interestingly, the XRD spectra indicate that the substituted cupric could enlarge the interplanar distance of planes that parallelled to [010] direction of LiFePO4 crystallines, which could widens the diffusion channels of Li+ along [010] direction. For further research, Lithium ion storage behavior of as-synthesized cupric ion substituted LiFePO4/C products were investigated via various electrochemical strategies, and the highest capacity of 152.4, 144.4, 126.7 and 110.5 mAhg(-1) was achieved by LiFe0.985Cu0.015PO4/C at discharge rate of I, 2, 5, and 10 C, respectively. Compared the result with that of LiFePO4/C, we can see that cupric ion substituted LiFePO4/C composites show enhanced electrochemical activity for Li+ storage with decreased overpotential and increased high rate capability for electrochemical reaction. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：256 / 263

页数：8

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