摘要
采用Co_3O_4为钴源,Li_2CO_3为锂源,Mg（OH）_2和H_3BO_3分别为镁源和硼源,按照化学计量比称取各原料并混合均匀后在高温条件下合成Li Co_（1-2y）Mg_yB_yO_2正极材料。采用扫描电镜（SEM）、X射线衍射（XRD）和恒电流间歇滴定（GITT）分别表征了样品的形貌、结构和锂离子扩散系数。将材料组装成CR2016型扣式电池,采用LAND测试仪进行电化学性能测试,结果表明,当掺杂的摩尔总量为2.0%时,材料在3.0~4.5 V范围内以0.2C充放电首次放电比容量达到190 m Ah/g,循环100次后容量保持率为88.6%。
Cathode material of LiCo_(1-2y)(Mg_yB_yO_2 was prepared at high temperature with Co_3O_4,Li_2CO_3,Mg( OH)_2and H_3BO_3 as starting materials mixed at a stoichiometric ratio. The morphology,structure and Li+diffusion coefficient were characterized by SEM,XRD and GITT,respectively. The electrochemical performance of the material assembled into CR2016 button cell was tested by using LAND tester. The results show that the LiCo_(0. 98)Mg_(0. 01)B_(0. 01)O_2 cathode exhibits an initial discharge capacity of 190 m Ah / g at 0. 2C and 3. 0 ~ 4. 5 V and a retention of 88. 6% after 100 cycles.
出处
《矿冶工程》
CAS
CSCD
北大核心
2016年第4期109-112,共4页
Mining and Metallurgical Engineering
关键词
锂离子电池
正极材料
钴酸锂
共掺杂
电化学性能
Li-ion battery
cathode material
Li Co O2
co-doping
electrochemical performance
