采用络合法制备了锂离子电池的活性正极材料LiNi0.9Co0.1O2粉体,实验表明合成的LiNi0.9Co0.1O2粉体结晶良好,层状结构发育完善。电池充放电测试结果表明,其容量及循环性能与LiNi0.9Co0.1O2粉体的合成温度有关,其中900℃合成得到的LiNi0.9Co0.1O2材料具有最好的电化学性能,首次放电比容量高达120.5mAh/g,循环30次后可逆放电比容量仍高达118.8mAh/g,容量损失仅为1.4％。文中对容量退化的原因进行了分析。
The layered LiNixCo1-xO2 compound was prepared by calcining a complex precursor at different temperatures.
The physical properties of the synthesized cathode materials were discussed on the basis of structural analysis. The charge and discharge cycling of the
cells containing the synthesized oxide as the positive electrode in conjunction with lithium metal and employing a non-aqueous electrolyte
shows that LiNi0.9Co0.1O2 treated at 900℃ exhibits the best electrochemical performance. The first discharge capacity of
LiNi0.9Co0.1O2 is 120.5 mAh/g with 30 cycle capacity loss of only 1.4%. The mechanisms of capacity degradation were investigated based on
phase and microstructure analyses.
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