锂离子电池正极材料LiNi_(1-y)Co_yO_2的研制

Research on Preparation of LiNi_1-yCo_yO_2 As Cathode Material in Lithium Ion Battery

在高温增加氧气压力的条件下,通过固态反应合成了锂离子电池正极材料LiNi(?)Co_vO_2。讨论了合成条件对产物的电化学性能的影响,得到最佳的反应条件为:反应时间(8h;10h);氧气压力0.20MPa;反应温度800℃;反应物的摩尔比Li:Ni:Co为1.2:0.9:0.1。合成出具有晶型完整、电化学性能优良的LiNi_(0.9)Co_(0.1)O_2产品,其放电容量达189.4mAh/g。实验结果表明,增加反应过程中氧气压力,对产物的结构及电化学性能有较大的影响。

LiNi1-yCoyO2 as cathode material of lithium ion battery was prepared by solid reaction at high temperature and oxygen pressure.Effects of preparation conditions on electrochemical properties of the product were discussed.The optimal reactive condition was obtained.i,e.reactive time is(8h:10h); oxygen pressure is 0.20MPa; reractive temperature is 800℃:and molar ratio of the reactants is Li:Ni=Co=1.2:0.9:0.1.The product LiNi0.9Co0.1,O2 was synthesized with perfect crystal structure and good electrochemical properties,which had a discharging capacity of up to 189.4 mAh/g.It was found that the increase in the oxygen pressure during the reactive processes exert important effects on the structure and electrochemical properties of the product.