采用空气气氛合成的锂镍钴氧正极材料的性能

The performance of Li-Ni-Co-O cathode materials synthesized in air atmosphere for cathode materials for lithium-ion battery

用控制结晶法合成了类似球形、颗粒细小的（Ni0.8Co0．2）2（OH）2CO3·4H2O前驱体，对前驱体二次干燥后，再与LiOH·H2O混合、研磨高温烧结，在空气气氛下合成了LiNi0.8Co0.2O2正极材料。采用正交实验对反应时间及锂配比因素进行了优化；同时也进行了XRD、EIS及SEM等相关表征研究。结果表明：在750℃下烧结时，当Li／（Ni＋Co）配比为1．05，烧结15h时得到的锂镍钴氧化合物性能最优；在0．1C，2．7～4．3V的条件下充放电，首次放电比容量达到179．2mAh／g。循环10次后容量变为167mAh／g，容量保持率为93％。

The approximately spherical and the fine particle＇ s precursor of （Ni0.8 Co0.2 ） 2（OH）2 CO3· 4H2O was synthesized by controlled crystallization method using NH3 ·H2O as the complexing agent. LiNi0.8 Co0.2O2 powders with orderly layered structure were obtained by sintering the precursor after second stage drying and LiOH · H2O in air atmosphere at high temperature after being ground. Orthogonal experimental study to optimizing the iufluence factors such as reaction time and various Li/M ratios had been done Meantime characteristics of XRD, EIS and SEM for LiNi0.8Co0.2O2 were carried out. The results showed that given the sintered temperature of 750℃ The LiNi0.8Co0.2O2 cathode materials which were obtained with 1.05 Li/（Ni＋Co）for 15h possess the best electrochemical property with the initial discharge specific capacity of 179.2mAh/g at 0.1C constant current between 2.7-4.3V, and change into 167mAh/g after 10 cycles with capacity retention of 93%.