Study on metal recovery process and kinetics of oxidative leaching from spent LiFePO4 Li-batteries

Xiaoming Zhang ¹Wen Xie ²Xiaolei Zhou ²Wenjie Zhang ¹Jiawei Wen ¹Xin Wang ³Guoyong Huang ¹Shengming Xu⁴

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作者信息

1. College of New Energy and Materials,China University of Petroleum,Beijing 102249,China;State Key Laboratory of Heavy Oil Processing,College of Chemical Engineering,China University of Petroleum,Beijing 102249,China
2. Beijing Spacecrafts,Beijing 100094,China
3. College of New Energy and Materials,China University of Petroleum,Beijing 102249,China;State Key Laboratory of Heavy Oil Processing,College of Chemical Engineering,China University of Petroleum,Beijing 102249,China;Ganfeng Lithium Group Co.,Ltd.,Xinyu 338000,China
4. Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Beijing Key Laboratory of Fine Ceramics,Tsinghua University,Beijing 100084,China
折叠

Abstract

A green environmental protection and enhanced leaching process was proposed to recover all elements from spent lithium iron phosphate(LiFePO4)lithium batteries.In order to reduce the influence of Al impurity in the recovery process,NaOH was used to remove impurity.After impurity removal,the spent LiFePO4 cathode material was used as raw material under the H2SO4 system,and the pressure oxidation leaching process was adopted to achieve the preferential leaching of lithium.The E-pH diagram of the Fe-P-Al-H2O system can determine the stable region of each element in the recovery process of spent LiFePO4 Li-batteries.Under the optimal conditions(500 r·min-1,15 h,363.15 K,0.4 MPa,the liquid-solid ratio was 4∶1 ml·g-1 and the acid-material ratio was 0.29),the leaching rate of Li was 99.24％,Fe,Al,and Ti were 0.10％,2.07％,and 0.03％,respectively.The Fe and P were precipitated and recovered as FePO4·2H2O.The kinetic analysis shows that the process of high-pressure acid leaching of spent LiFePO4 materials depends on the surface chemical reaction.Through the life cycle assessment(LCA)of the spent LiFePO4 whole recovery process,eight midpoint impact categories were selected to assess the impact of recovery process.The results can provide basic environmental information on production process for recycling industry.

Key words

Spent LiFePO4 Li-batteries/Oxidative leaching/Kinetic study/Life cycle assessment

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基金项目

National Natural Science Foundation of China(51834008)

National Natural Science Foundation of China(52022109)

National Natural Science Foundation of China(52274307)

National Natural Science Foundation of China(21804319)

National Key Research and Development Program of China(2021YFC2901100)

Science Foundation of China University of Petroleum,Beijing(2462022QZDX008)

Science Foundation of China University of Petroleum,Beijing(2462021QNX2010)

Science Foundation of China University of Petroleum,Beijing(2462020YXZZ019)

Science Foundation of China University of Petroleum,Beijing(2462020YXZZ016)

State Key Laboratory of Heavy Oil Processing(HON-KFKT2022-10)

出版年

2024

中国化学工程学报(英文版)

中国化工学会

中国化学工程学报(英文版)

CSTPCDEI

影响因子：0.818

ISSN：1004-9541

参考文献量4

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