废旧LiCoO2材料再生LiNi0.8Co0.1Mn0.1O2正极材料及性能研究

Regeneration Process of LiNi0.8Co0.1Mn0.1O2Cathode Material from Spent LiCoO2 Batteries and its Performance

摘要:

针对废旧锂离子电池数量不断增加的现状,对废旧LiCoO2电池的回收和再生流程进行探究。以废旧LiCoO2电池为原料,通过预处理,酸浸,共沉淀步骤,实现了LiNi0.8Co0.1Mn.1O2正极材料的再生。ICP-OES分析浸出液中的元素含量,SEM和XRD表征材料形貌和结构,扣式电池的电化学测试定量分析材料的电化学性能。研究表明,利用浸出液可以再生形貌和层状结构良好的正极材料,在0.2C,2.8~4.3V电压范围内进行充放电循环测试,首周放电比容量可达到210.8 mAh/g,经过50周充放电循环后的容量保持率为87%,表现出良好的循环稳定性,为废旧锂离子电池的再生提供支撑和发展方向。

Abstract:

In view of the waste lithium ion batteries increasing, the technologies for recycling and regeneration of spent LiCoO2 batteries have been explored. In this paper, LiNi0.8Co0.1Mn0.1O2 cathode material was re-synthesized from discard LiCoO2 batteries through pre-treatment, acid leaching and co-precipitation. he concentration of metal ion in leachate were analyzed by ICP-OES, the morphology and structure of cathode materials were characterized by the SEM and XRD, the electrochemical properties of coin batteries were performed by the electrochemical tests. The results showed that the regenerated material from acid leaching lixivium exhibits the desired morphology and well layer structure. Under the condition of 2.8~4.3V, the initial discharge capacity of regenerated material is 210.8 mAh/g at 0.2C. After 50 cycles, the capacity retention of re-synthesized cathode material is 87%, showing good cycle performance, which will support the recycling process for spent Li-ion batteries