电化学
磷酸铁锂
浸出(土壤学)
电解
磷酸铁
杂质
锂(药物)
阳极
化学
无机化学
粒径
萃取(化学)
磷酸盐
化学工程
核化学
材料科学
电极
色谱法
有机化学
土壤科学
土壤水分
物理化学
内分泌学
工程类
医学
电解质
环境科学
作者
Zijun Qin,Xiaohui Li,Xinjie Shen,Yi Cheng,Feixiang Wu,Yunjiao Li,Zhenjiang He
标识
DOI:10.1016/j.wasman.2023.11.031
摘要
In this paper, a green, efficient and low-cost process for the selective recovery of lithium from spent LiFePO4 by anodic electrolysis is proposed. The leaching rates of Li, Fe and P under different conditions were explored and the optimal conditions are obtained. In the optimal conditions, Li, Fe and P leaching rates were 96.31%, 0.06% and 0.62% respectively. The Li/Fe selectivity was over 99.9%. The product obtained is isostructural FePO4 and retains the original particle morphology. The FePO4 obtained can be synthesised into LiFePO4/C by direct regeneration process or impurity removal regeneration process. The material synthesized by the latter process has a better electrochemical performance, with a discharge specific capacity of 144.5 mAh/g at 1.0C and a capacity retention of 92.0% over 500cycles. The superior performance can be attributed to an impurity removal process that reduced agglomeration and improved particle morphology.
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