废旧混合锂电池正极材料还原酸浸行为研究

摘要针对废旧混合锂电池正极材料中有价金属元素镍钴锰的高效分离浸出，设计开发了2种不同混合废料体系：LiCoO₂与Li （Ni_1/3Co_1/3Mn_1/3） O₂、LiMn₂O₄与Li （Ni_1/3Co_1/3Mn_1/3） O₂，研究了还原剂用量、硫酸初始浓度、浸出温度、液固比对浸出过程的影响。LiCoO₂与Li （Ni_1/3Co_1/3Mn_1/3） O₂混合废料较适宜浸出参数为：浸出温度80℃、反应时间90 min、H₂SO₄浓度2.3 mol·L^-1，液固比R=8 mL·g^-1、还原剂Na₂SO₃用量=1.2倍理论量；LiMn₂O₄与Li （Ni_1/3Co_1/3Mn_1/3） O₂组成的混合废料的较适宜浸出实验参数为：浸出温度60℃、反应时间90 min、H₂SO₄浓度2.3 mol·L^-1，R=8 mL·g^-1、还原剂Na₂SO₃用量=1.2倍理论量。得到的浸出规律为混合锂离子电池正极废料回收工艺的广泛适应性提供了参考思路。

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	翁雅青
	晏南富
	崔红敏
	王爽

关键词：废旧电池回收利用混合材料还原酸浸

Abstract： For the purpose of high-efficiency separation and leaching of the valuable metal elements in spent lithium ion battery cathode materials, two blended compositions have been designed:LiCoO₂ and Li(Ni_1/3Co_1/3Mn_1/3)O₂, LiMn₂O₄ and Li(Ni_1/3Co_1/3Mn_1/3)O₂. Effects of reducing agent, concentration of sulfuric acid, leaching temperature, and liquid-solid ratio on the leaching process were investigated in details. The optimal leaching parameters of LiCoO₂ and Li(Ni_1/3Co_1/3Mn_1/3)O₂ waste are:leaching temperature 80℃, reaction time 90 minutes, H₂SO₄ concentration 2.3 mol·L^-1, ratio of liquid and solid R=8 mL·g^-1, The amount of reducing agent Na₂SO₃=1.2 times the theoretical amount. The optimal leaching experiment parameters of mixed waste composed of LiMn₂O₄ and Li(Ni_1/3Co_1/3Mn_1/3)O₂ are:leaching temperature 60℃, reaction time 90 minutes, H₂SO₄ concentration 2.3 mol· L^-1, R=8 mL·g^-1, the amount of reducing agent Na₂SO₃=1.2 times the theoretical amount. The obtained leaching law provides a reference idea for the wide adaptability of the recovery process of mixed lithium-ion battery cathode waste.

Keywords： spent lithium-ion batteries recycling blended materials reductive acid leaching

Received 2021-09-25;

Fund:国家自然科学基金青年基金项目（51604129）；江西省重点研发计划项目（20151BBE50107）；江西省科学院省级科技计划项目（2021YSBG21003）。

Corresponding Authors: 王爽,E-mail:wangshuangsea@163.com。 Email: wangshuangsea@163.com

About author: 翁雅青(1985-),女,博士研究生,助理研究员,现从事锂电池回收利用方面的研究。

引用本文:

翁雅青, 晏南富, 崔红敏, 王爽.废旧混合锂电池正极材料还原酸浸行为研究[J]. 化学工业与工程, 2021,38(6): 65-73

Weng Yaqing, Yan Nanfu, Cui Hongmin, Wang Shuang.Study on the Reduction Acid Leaching Behavior of the Cathode Materials of Hybrid Lithium Ion Batteries Waste[J]. Chemcial Industry and Engineering, 2021,38(6): 65-73

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