期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 71, 期 9, 页码 1196-1200出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2010.04.015
关键词
LiFePO4; Asphalt; Lithium battery; Ni doping; Spherical
资金
- National Natural Science Foundation of China [20673100]
- Natural Science Foundation of Zhejiang Province [Y4090420]
Spherical LiFePO4/C powders were synthesized by the conventional solid-state reaction method via Ni doping. Low-cost asphalt was used as both the reduction agent and the carbon source. An Ni-doped spherical LiFePO4/C composite exhibited better electrochemical performances compared to an un-doped one. It presented an initial discharge capacity of 161 mAhg(-1) at 0.1 C rate (the theoretical capacity of LiFePO4 with 5 wt% carbon is about 161 mAhg(-1)). After 50 cycles at 0.5 C rate, its capacity remained 137 mAhg(-1) (100% of the initial capacity) compared to 115 mAhg(-1) (92% of the initial capacity) for an un-doped one. The electrochemical impedance spectroscopy analysis and cyclic voltammograms results revealed that Ni doping could decrease the resistance of LiFePO4/C composite electrode drastically and improve its reversibility. (C) 2010 Elsevier Ltd. All rights reserved.
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