废旧混合锂电池正极材料还原酸浸行为研究

Study on the Reduction Acid Leaching Behavior of the Cathode Materials of Hybrid Lithium Ion Batteries Waste

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:LiCoO_(2)与Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2)、LiMn_(2)O_(4)与Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2),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。LiCoO_(2)与Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2)混合废料较适宜浸出参数为:浸出温度80℃、反应时间90 min、H_(2) SO_(4)浓度2.3 mol·L^(-1),液固比R=8 mL·g^(-1)、还原剂Na_(2)SO_(3)用量=1.2倍理论量;LiMn_(2)O_(4)与Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2)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、H_(2) SO_(4)浓度2.3 mol·L^(-1),R=8 mL·g^(-1)、还原剂Na_(2)SO_(3)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。

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:LiCoO_(2) and Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2),LiMn_(2)O_(4)and Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2).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 LiCoO_(2)and Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2)waste are:leaching temperature 80℃,reaction time 90 minutes,H_(2) SO_(4)concentration 2.3 mol·L^(-1),ratio of liquid and solid R=8 mL·g^(-1),The amount of reducing agent Na_(2)SO_(3)=1.2 times the theoretical amount.The optimal leaching experiment parameters of mixed waste composed of LiMn_(2)O_(4)and Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2)are:leaching temperature 60℃,reaction time 90 minutes,H_(2) SO_(4)concentration 2.3 mol·L^(-1),R=8 mL·g^(-1),the amount of reducing agent Na_(2)SO_(3)=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.