锂离子电池正极材料LiNi0.8Co0.15Al0.05O2的制备与性能

采用共沉淀法制备粒径10 μm左右的前驱体Ni_0.8Co_0.15Al_0.05（CO₃）_x（OH）_y，然后采用该前驱体和LiOH·H₂O成功制备了锂离子电池正极材料LiNi_0.8Co_0.15Al_0.05O₂（LiNCA），并详细研究了煅烧氛围、煅烧温度和煅烧方式等条件对LiNCA电化学性能的影响。研究表明，在O₂中煅烧获得的LiNCA放电容量达到170 mAh·g^-1，50次循环后容量保持率达到95%，性能明显优于空气氛围中煅烧得到的LiNCA。在O₂氛围下，700~750℃温度范围煅烧得到的LiNCA性能最好，煅烧温度过高或过低，LiNCA性能均明显下降。将前驱体在O₂氛围中450℃条件预煅烧，然后与LiOH·H₂O在700~750℃混合煅烧的煅烧方式，得到的LiNCA放电容量明显提高，可达190 mAh·g^-1。

Preparation and performance of LiNi0.8Co0.15Al0.05O2 cathode material of lithium ion battery

By means of coprecipitation, the precursor Ni_0.8Co_0.15Al_0.05(CO₃)_x (OH)_y with about 10 μm particle size was prepared. The cathode material of lithium ion battery, LiNi_0.8Co_0.15Al_0.05O₂ (LiNCA) was fabricated successfully with the precursor and LiOH·H₂O, and the effects of calcination atmosphere, calcination temperature and calcination method on electrochemical performances were studied. The results show that the discharge specific capacity of the LiNCA calcined in oxygen reaches 170 mAh·g^-1, and the capacity retention ratio after 50 cycles reaches 95%, which is better than the LiNCA calcined in air. In the oxygen atmosphere, the LiNCA obtains the best performance when the calcination temperature is in range of 700 to 750℃. If the calcination temperature is too high or too low, the performance of LiNCA decreases significantly. When the precursor is precalcined at 450℃ in oxygen atmosphere, and then calcined with mixed LiOH·H₂O at 700 to 750℃, the LiNCA discharge specific capacity reaches 190 mAh·g^-1, which increases significantly.