不同钴含量对三元正极材料性能的影响研究
收稿日期: 2021-03-24
网络出版日期: 2021-11-15
Study on effect of different cobalt content on properties of ternary cathode materials
Received date: 2021-03-24
Online published: 2021-11-15
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。
张彬 , 张萍 , 向晓刚 , 王政强 . 不同钴含量对三元正极材料性能的影响研究[J]. 无机盐工业, 2021 , 53(11) : 91 -94 . DOI: 10.19964/j.issn.1006-4990.2021-0183
With the popularization and promotion of new energy vehicle and lithium-ion batteries,the need of cobalt is gradu-ally increased.So,reducing the content of cobalt in power ternary cathode materials has become an urgent need for all compa-nies in the new energy industry chain. Different cobalt content in NCM622 cathode material was explored.Four kinds of ca-thode materials,NCM60/20/20,NCM60/15/25,NCM60/10/30,NCM60/05/35,were synthesized under the optimum experi-mental conditions.The effect of cobalt content on the ternary cathode materials and lithium-ion batteries was explored by ana-lyzing 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 mA·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.
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