期刊
JOURNAL OF POWER SOURCES
卷 269, 期 -, 页码 194-202出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.06.157
关键词
Lithium iron phosphate; Cerous phosphate; Hybrid coating; High rate; Low temperature
资金
- Natural Science Research Keystone Program of Universities in Hebei Province China [ZH2011228]
- Natural Science Foundation in Hebei Province China [B2012203069]
Novel cerous phosphate and carbon hybrid coating LiFePO4 cathode material successfully synthesized via liquid-phase precipitation reaction combined with the high temperature solid state method have been studied in lithium ion batteries. LiFePO4 deposited an appropriate amount of cerous phosphate in carbon coating layer shows higher reversible capacity and stable cycle performance compared with the LiFePO4/C. The good conductivity and stability of the hybrid coating layer can be favorable for these properties of LiFePO4, which increase Li+ ion and electronic transport on the surface and into the bulk of LiFePO4 electrode, avoid HF dissolving LiFePO4 in electrolyte, and facilitate the transfer kinetics. LiFePO4/C CePO4 (1.0 mol%) electrode exhibits a stable cyclability and the highest capacity among all the LiFePO4/C -xCePO(4) samples. The initial discharge capacity of LiFePO4/C CePO4 (1.0 mol%) is 166.1, 161.4, 143.7 and 1203 mAh g(-1) at 1, 2, 5 and 10 C rates, respectively. And the capacity retention remains as high as 77.5% even after 650 cycles at 10 degrees C. In addition, the material shows a higher reversible specific capacity of 100.9 mAh g(-1) under lower discharging rate at 20 degrees C. (C)2014 Elsevier B.V. All rights reserved.
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