关键词: 二次锂离子电池正极材料, LiAl_yNi_(1-y)O_2固溶体, 循环伏安实验

Abstract: 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.

Key words: Cathode material for lithium ion batteries, LiAl yNi 1-y O 2 solutions, CV experiment