Regenerating LiFePO4/C using recycled LiH2PO4 as raw material

Weihao Liu; Xianbiao Chen; Wenhua Zhang; Fang Dai; Shuai Wang; Wang Peng; Jie  Zeng; Zhe Chen; Yinbao Miao; Jia Liu

doi:10.54097/9z7r4e23

Authors

Weihao Liu
Xianbiao Chen
Wenhua Zhang
Fang Dai
Shuai Wang
Wang Peng
Jie Zeng
Zhe Chen
Yinbao Miao
Jia Liu

DOI:

https://doi.org/10.54097/9z7r4e23

Keywords:

LiH2PO4; LiFePO4/C; electrochemical.

Abstract

In order to achieve low-cost regeneration of waste lithium iron phosphate electrode sheets, this paper uses LiH₂PO₄ recovered by acid leaching method as raw material to regenerate LiFePO₄/C, and further explores the effect of temperature on the electrochemical performance of regenerated LiFePO₄/C. Through material structure characterization, it was found that the characteristic peaks of the recovered LiH₂PO₄corresponded one-to-one with the standard card, indicating a high degree of crystallinity, no obvious impurities, high purity, and complete crystal structure. When the temperature is 750℃, the lithium iron ratio is 1.03, and the conductive carbon black content is 5% of the mixture mass fraction, the regenerated LiFePO₄/C exhibits the best electrochemical performance, with a first week discharge specific capacity of 125.7mAh/g at a rate of 0.1C; At 1C magnification, the first week discharge specific capacity is 106.2mAh/g, and after the 100th week, the discharge specific capacity is 93.1mAh/g, with a capacity retention rate of 87.7%. The cost of raw materials used is relatively low compared to other processes, and the regenerated LiFePO₄/C produced by this process has the advantage of low price, making it more suitable for the mid to low-end energy storage market.

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