Study On The Properties Of LiNi ₀ Pb 2 2 Cathode Materials Prepared By Solid State Method

The LiNi0.8Co0.15Al0.05O2 cathode material (NCA) has a high energy density and a stable cycling capacity. It has drawn much attention since it came to birth. However, it is very difficult to synthesize this material, which limits its preparation in large amount. Among all the synthetic methods of LiNi0.8Co0.15Al0.05O2, the solid-state method has many advantages such as the simple synthesis process, low cost, easy for industrial production, and has been widely used in the preparation of cathode materials. In this paper, based on the Hishear Disperser and Nano Mill, we discuss the effect of mixing mode, sintering temperature, lithium resource and surface modification on the properties and electrochemical performance for the LiNi0.8Co0.15Al0.05O2 cathode material.The LiNi0.8Co0.15Al0.05O2 cathode materials synthesized by sintering Hishear Disperser precursor and LiOH·H2O at 700℃ has the highest initial discharge specific capacity of 182.0mAh/g at 1C rate. The LiNi0.8Co0.15Al0.05O2 cathode materials synthesized by sintering Nano Mill precursor and LiOHH2O at 750℃ has the highest initial discharge specific capacity of 169.1mAh/g at 1C rate. The cathode materials synthesized by Li2CO3 always have stable cycling performance and reach the highest initial discharge specific capacity of 170.9mAh/g and 166.2mAh/g at the sintering temperature of 800℃.By using NaBH4 reducing Zn(NO3)2·6H2O, we gain the Zn-modified LiNi0.8Co0.15Al0.05O2 cathode materials. The charge-discharge results show that the effect of lower Zn content on cycle stability is not obvious, and higer Zn content will reduce the discharge capacity of LiNi0.8Co0.15Al0.05O2 cathode material.