LiAlyNi1-yO2作为锂离子电池正极材料的研究

本文采用固相反应法合成了一系列不同ｙ值的ＬｉＡｌｙＮｉ１－ｙＯ２材料，通过对其电化学性能的研究发现，在适当的烧结条件下，ＬｉｘＡｌ０．２５Ｎｉ０．７５Ｏ２作为二次锂离子电池的正极材料，其耐过充性和循环性能都有明显改善，当Ｌｉ含量大于１时，在高电位范围充放（３－４．８Ｖ）３０次循环后仍保持着首次放电容量的９５％，而ＬｉＮｉＯ２在此电压范围内经２０次循环后却只有首次放电容量的５６％，通过循环伏安实验表

Studies of the LiAlyNi1-yO2 as Cathode Materials for Rechargeable Lithium Ion Batteries

In this paper, we have synthesized series of single_phase LiAl yNi 1-y O 2 (differentive in value_y) by solid reaction. Through examining their electrothemical properties, found that, under a proper sintering condition, Li xAl 0.25 Ni 0.75 O 2 solution for cathode materials of rechargeable lithium ion batteries showed more pleasing properties in overcharge_resist and cycling life ( vs LiNiO 2). When x>1, the capacity can be kept 125mAh/g after 30 cycles under higher charged/discharged voltages ranging from 3.0 V to 4.8 V, whereas that of pure LiNiO 2 has only 61 nAh/g after 25 cycles. The results of CV for LiAl yNi 1-y O 2 and pure LiNiO 2 showed that this may be due to the Al 3+ doping and by preventing Li + from overcharging, Al 3+ conbined with Li + obviated the phase transmission during charged/discharged progress.