锂离子蓄电池正极材料LiNi_(0.8)Mg_xCo_(0.2-x)O_2的制备及性能

Synthesis and characterization of LiNi_(0.8)Mg_xCo_(0.2-x)O_2 as cathodes for lithium-ion batteries

采用控制结晶法合成了Ni0.8Co0.2(OH)2,然后将其与Mg(NO3)2和LiNO3作用,生成胶状物前驱体,再经高温固相反应制备了LiNi0.8MgxCo0.2-xO2。由此得到的正极材料LiNi0.8MgxCo0.2-xO2 经X射线衍射、循环伏安、充放电实验等技术测量,分别对其结构形貌、电化学性能及电池的容量特性,进行了分析和讨论。结果表明:对LiNi1-xCoxO2掺入Mg2+增强了材料层状结构的稳定性,改善了其循环稳定性能。LiNi0.8Mg0.045Co0.155O2正极材料首次放电比容量达174 mAh/g, 30次循环充放电后保持初始放电比容量的93.8% 。

Ni0.8Co0.2(OH)2 was synthesized via a 'controlled crystallization' method, the precursor was formed by sintering the Ni0.8Co0.2(OH)2?Mg(NO3)2 and LiNO3 , the cathode material LiNi0.8MgxCo0.2-xO2 was prepared by a solid state reaction at high temperature and studied by slowing cyclic voltammogram (SCV)?X-ray diffraction and a charge-discharge characteristics, and it's structure characteristics?electrochemical behavior and charge-discharge cycling were discussed. Results show that the layered structure of the crystal lattice is stabilized and the cyclic performance is improved by doped with Mg2+. The cathode material has an initial discharge capacity of 174 mAh/g with discharge retention of 93.8% after 30 cycles.