锂离子电池正极材料LiNi_(1-y)Al_yO_2的制备及性能

Preparation and properties of LiNi_(1-y)Al_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LiNi1-yAlyO2 。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是 :2个恒温阶段的反应时间为 8h和 10h ;氧气压力为0 .2 0MPa ;反应温度 80 0℃ ;反应物Li,Ni,Al之间的摩尔比为 1.1∶0 .95∶0 .0 5。合成出具有晶型完整、电化学性能优良的LiNi0 .95Al0 .0 5O2 产品 ,其放电容量达 182 .3mA·h/g。结果表明 ,Al3 + 的添加对LiNiO2 的结构及电化学性能有较大的改善。

LiNi 1-yAl yO 2 used as cathode material of lithium ion battery was prepared by solid reaction at high temperature under oxygen pressure. The influences of preparation conditions on electrochemical performances of the above product were discussed. The optimal reaction conditions were obtained, i.e. reactive time is 8 h and 10 h; oxygen pressure is 0.20 MPa; reactive temperature is 800 ℃; and molar ratio between the reactants Li, Ni and Al is 1.1∶0.95∶0.05. The product of LiNi 0.95Al 0.05O 2 was synthesized with the perfect crystal structure and the good electrochemical properties. Whose discharged capacity is up to 182.3 mA·h/g. It is found that the addition of Al 3+ greatly improves the structure and electrochemical properties of LiNiO 2.