Non-stoichiometric synthesis and electrochemical performance of LiFe 1-xPO4/C cathode materials for lithium ion batteries

Chenglin Hu, Yuping Wu, Yongnian Dai

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摘要

Non-stoichiometric LiFe1-xPO4/C composites were synthesized by a simple sol-gel method. Different impurities were detected in the X-ray diffraction measurements with the change of Fe content. The effects of Fe-poor on the structure and electrochemical performance of LiFePO4 were investigated. Compared with stoichiometric LiFePO4/C, non-stoichiometric samples show better electrochemical performance because they have smaller impedance and faster lithium ion diffusion. Among these non-stoichiometric samples, LiFe0.94PO4/C cathode delivers the highest capacity of 149 mAh g-1 at 0.2 C and 103 mAh g -1 at 5 C and no capacity loss was found after 100 full cycles.

源语言英语
文章编号1450016
期刊Functional Materials Letters
7
2
DOI
出版状态已出版 - 4月 2014
已对外发布

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