Method for recycling lithium battery positive electrode material LiCoO2 by ternary eutectic solvent system

The invention belongs to the field of battery recovery and eutectic solvents, and relates to a method for recovering a lithium battery positive electrode material LiCoO2 by a ternary eutectic solvent system. According to the invention, choline chloride, ethylene glycol and benzoic acid are mixed according to a molar ratio of 1: (1.9-1.5): (0.1-0.5) to prepare a ternary eutectic solvent system, and the prepared ternary eutectic solvent is low in viscosity, good in fluidity, low in recovery cost and environment-friendly. The ternary eutectic solvent system prepared by the method can efficiently and quickly recover cobalt and lithium in the battery positive electrode material, the leaching time is shortened, and the leaching efficiency of cobalt and lithium is improved. 本发明属于电池回收、低共熔溶剂领域，涉及一种三元低共熔溶剂体系回收锂电池正极材料LiCoO2的方法。本发明采用氯化胆碱、乙二醇及苯甲酸以1：（1.9~1.5）：（0.1~0.5）摩尔比混合配置三元低共熔溶剂体系，配置的三元低共熔溶液粘度低，流动性好，回收成本低，对环境友好。本发明制备的三元低共熔溶剂体系可以高效快速的回收电池正极材料中的钴和锂，缩短了浸出时间，提高了钴和锂的浸出效率。