纳米氧化钛包覆523镍钴锰酸锂性能影响的试验研究

Study on the Effect of Nano-Titanium Oxide Coating on the Performance of 523 Nickel-Cobalt Manganese Acid

摘要: 本试验采用高温固相法开展了包覆纳米氧化钛等工艺参数对LiNi_0.5Co_0.2Mn_0.3O₂材料性能影响的试验探究，通过对LiNi_0.5Co_0.2Mn_0.3O₂材料的振实密度、粒度分布、pH值、电学性能等各项检测分析，得出：当包覆量为0.15%、煅烧温度为700℃，时间为6 h时，材料的物理性能与电化学性能最佳。在3.0~4.3 V电压范围内经纳米氧化钛包覆的LiNi_0.5Co_0.2Mn_0.3O₂材料1C初始容量达到160.82 mAh/g，50次循环充放电容量保持率为98.89%，较未包覆的LiNi_0.5Co_0.2Mn_0.3O₂保持率提高了3.66%。证明材料的循环性能得到明显改善。在物理指标方面，最优参数条件下，LiNi_0.5Co_0.2Mn_0.3O₂材料的振实密度为2.88 g/cm³、D50为11.98 μm，此指标可满足动力锂电池市场的要求。

Abstract: This experiment carries out the coating of nano titanium oxide and other process parameters on LiNi_0.5Co_0.2Mn_0.3O₂ material by adopting the high temperature solid phase method to perform im-pact test to explore, through the LiNi_0.5Co_0.2Mn_0.3O₂ material tap density, particle size distribution, pH, electrical properties and a series of test analysis. It is concluded that: when the coating is 0.15%, calcination temperature 700˚C, time 6 h, the material physical properties and electrochemical properties are the best. In the range of 3.0~4.3 V, the initial capacity of LiNi_0.5Co_0.2Mn_0.3O₂ coated with nano-oxide coating was 160.82 mAh/g, and the retention rate of 50 cycles was 98.89%, which was 3.66% higher than the uncoated LiNi_0.5Co_0.2Mn_0.3O₂ retention rate. The cyclic properties of the materials have been improved obviously. In terms of physical indexes, the vibration density of LiNi_0.5Co_0.2Mn_0.3O₂ material is 2.88 g/cm³ and D50 is 11.98 μm, which can meet the requirements of the battery market.