废旧动力锂离子电池中LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)正极材料的回收与再利用  

Recovery and Recycling of LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) Cathode Materials in Spent Power Lithium-ion Batteries

作　　者：谭燚 王家乐 文敏玥 缪畅[1] 肖围[1] TAN Yi;WANG Jiale;WEN Minyue;MIAO Chang;XIAO Wei(College of Chemistry & Environmental Engineering,Yangtze University,Jingzhou 434023,China)

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023

出　　处：《有色金属工程》2021年第11期159-165,共7页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51874046);湖北省自然科学基金杰青项目(2020CFA090)。

摘　　要：通过碱液浸出法对废旧动力锂离子电池中的LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)正极材料进行处理,在NaOH浓度为0.5 mol/L、固液比为0.1 g/mL条件下,25℃超声15 min,浸出率可达100%。将浸出物料通过共沉淀法,控制陈化时间分别为16、20和24 h制备新NCM523正极材料。当陈化时间为20 h时,SEM结果表明所制备出的材料形貌呈类球型,表面最为光滑。XRD精修数据显示其锂镍混排值最低,为3.21%。将其组装成扣式电池后,在0.1C下首次放电比容量为153.1 mAh/g,库伦效率为83.49%。在2.0C下循环50圈后,放电比容量为120.4 mAh/g,容量保持率为89.9%。Treatment of LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode materials in waste power lithium-ion batteries by lye leaching method was carried out.Under the conditions of NaOH concentration of 0.5 mol/L and solid-liquid ratio of 0.1 g/mL,sonicated for 15 min at 25℃,the leaching rate can reach 100%.The leaching materials were synthesized as new NCM523 cathode material by co-precipitation method to control the aging time of 16,20 and 24 h respectively.When the aging time is 20 h,SEM results show that the prepared material has a spherical shape with the smoothest surface.XRD refined data shows that the Li-Ni mixed value is the lowest,which is 3.21%.Assembled into button cell and test its electrochemical performance,it delivers a first discharge specific capacity of 153.1 mAh/g at 0.1C with coulombic efficiency of 83.49%.After 50 cycles at 2.0C,it delivers discharge specific capacity of 120.4 mAh/g,while the capacity retention rate can reach 89.9%.

关 键 词：废旧动力锂离子电池 电化学性能 LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) 共沉淀法 

分 类 号：TM912[电气工程—电力电子与电力传动]