(1. 东北大学 材料与冶金学院, 沈阳 110004;
2. 辽宁石油化工大学 石油化工学院, 抚顺 113001)
摘 要: 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0.20MPa；反应温度800℃； 反应物Li，Ni，Al之间的摩尔比为1.1∶0.95∶0.05。 合成出具有晶型完整、电化学性能优良的LiNi0.95Al0.05O2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。
关键字: 锂离子电池； 正极材料； 氧气压力； 电化学性能
LiNi1-yAlyO2 as cathode
material in lithium ion battery
（1. School of Material and Metallurgy, Northeastern University,
Shenyang 110004, China;
2. School of Petroleum and Chemical Engineering,
Liaoning University of Petroleum and Chemical Technology,
Fushun 113001, China）
Abstract:LiNi1-yAlyO2 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 8h and 10h; oxygen pressure is 0.20MPa; reactive temperature is 800℃; and molar ratio between the reactants Li, Ni and Al is 1.1∶0.95∶0.05. The product of LiNi0.95Al0.05O2 was synthesized with the perfect crystal structure and the good electrochemical properties. Whose discharged capacity is up to 182.3mA·h/g. It is found that the addition of Al3+ greatly improves the structure and electrochemical properties of LiNiO2.
Key words: lithium ion battery; cathode material; oxygen pressure; electrochemical prop
