不同钴含量对三元正极材料性能的影响研究  

Study on effect of different cobalt content on properties of ternary cathode materials

作　　者：张彬 张萍 向晓刚 王政强 ZHANG Bin;ZHANG Ping;XIANG Xiaogang;WANG Zhengqiang(Yibin Libode new materials Co.,Ltd.,Yibin 644000,China;Yibin Tianyuan Group)

机构地区：[1]宜宾锂宝新材料有限公司,四川宜宾644000 [2]宜宾天原集团

出　　处：《无机盐工业》2021年第11期91-94,共4页Inorganic Chemicals Industry

摘　　要：随着新能源汽车和锂离子电池的普及和推广,钴的需求量逐渐增大,降低动力三元正极材料中钴元素的含量,成为新能源产业链所有公司的当务之急。通过对NCM622三元正极材料中不同钴元素的含量进行实验探索,在最佳实验条件下,分别合成NCM60/20/20、NCM60/15/25、NCM60/10/30、NCM60/05/35 4种正极材料,并对三元正极材料的SEM、XRD、首次放电容量、首次放电效率、倍率性能、循环性能及直流阻抗(DCR)增长等性能指标进行分析,探索钴元素含量对三元正极材料和锂离子电池的影响。实验发现,钴元素物质的量分数由20%降低至5%,材料的首次放电容量由178 mA·h/g降低至165 mA·h/g,50圈循环保持率由96%降低至88%,DCR由10%增长至20%,当钴元素物质的量分数低于10%时,性能衰减更为明显。With the popularization and promotion of new energy vehicle and lithium-ion batteries,the need of cobalt is gradually increased.So,reducing the content of cobalt in power ternary cathode materials has become an urgent need for all companies in the new energy industry chain. Different cobalt content in NCM622 cathode material was explored.Four kinds of cathode materials,NCM60/20/20,NCM60/15/25,NCM60/10/30,NCM60/05/35,were synthesized under the optimum experimental conditions.The effect of cobalt content on the ternary cathode materials and lithium-ion batteries was explored by analyzing the SEM,XRD,initial discharge capacity,initial efficiency,rate performance,cycle performance and DCR growth.It′s found that,when the molar content of cobalt decrease from 20% to 5%,the initial discharge capacity decrease from 178 m A·h/g to 165 mA·h/g;the capacity retention of the 50 th cycle decrease from 96% to 88%;the DCR growth from 10% to 20%.When the molar content of cobalt was less than 10%,the properties were worst.

关 键 词：钴元素 三元正极材料 首次放电容量 倍率性能 

分 类 号：TQ138.12[化学工程—无机化工]