关键词: 钴元素, 三元正极材料, 首次放电容量, 倍率性能

Abstract:

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.

Key words: cobalt element, ternary cathode material, initial discharge capacity, rate performance