摘要
镍钴锰三元材料由于同时具备高容量、高密度等特点,目前已经成为3C、电动工具及电动汽车锂电正极材料的最佳选择。为了避免电解液和正极材料发生副反应及增强正极材料的导电性,对正极材料进行改性显得尤为重要。以Al_(2)(SO_(4))_(3)和CoSO_(4)为包覆原料,NaOH为沉淀剂,采用湿法包覆在前驱体表面先后包覆一层氢氧化铝和氢氧化钴,经过氧化得到羟基氧化铝和羟基氧化钴双层包覆的前驱体材料。分别对包覆前后的材料进行了LS-POP9、BET、TD、SEM、XRD、IR及正极电化学测试表征。实验表明,经过烧结后的正极材料同时具备较好的容量保持率和循环特性。室温下,0.2C(3.0~4.3V)比容量为175mAh/g,首效不小于85%,50次循环容量保持率大于100%。可见,双层复合包覆的方法,为提高锂电正极材料的性能提供了一种思路。
Nickel-cobalt-manganese ternary materials have become the best choice of lithium cathode materials for 3C,power tool and selectric vehicles due to its high capacity and high density.In order to avoid side reaction between electrolyte and cathode materials and enhance the conductivity of cathode material,it is particularly important to modify the cathode material.In this paper,Al_(2)(SO_(4))_(3) and CoSO_(4) were used as coating raw materials.NaOH was used as precipitator.The surface of the precursor was coated with a layer of aluminum hydroxide and cobalt hydroxide by wet coating,and then oxidized to obtain AlOOH and CoOOH.The materials were characterized by LS-POP9,BET,TD,SEM,XRD and electrochemical test.The results show that the sintered cathode material has good capacity retention and cycle performance.In the test for 0.2C(3.0-4.3 V),the specific capacity reaches 175 mAh/g,the initial charge-discharge efficiency,and it is excellent with 100% capacity retention rate after 50 cycles.It can be seen that the double-layer composite coating method provides a way to improve the performance of lithium anode materials.
作者
刘飞
杨永生
刘纪迎
米玺学
孙磊
王耀玺
LIU Fei;YANG Yongsheng;LIU Jiying;MI Xixue;SUN Lei;WANG Yaoxi(Ningxia zhongse Jinhui New Energy Co.,Ltd.,Shizuishan 753000,China)
出处
《粉末冶金工业》
CAS
北大核心
2023年第2期65-68,77,共5页
Powder Metallurgy Industry
关键词
锂离子电池
正极材料
前驱体
表面包覆
lithium ion battery
cathode material
ternary precursor
surface modification
作者简介
刘飞(1976-),男,学士,高级工程师,主要研究方向为锂离子电池正极材料。
