纳米氧化铝包覆镍钴锰酸锂三元材料的试验研究

A Study on LiNi_0.5Co_0.2Mn_0.3O₂ Materials Coated with Nano-Al₂O₃

摘要: 本论文采用高温固相法将镍钴锰酸锂三元材料与纳米氧化铝按一定比例混匀，在高温下，加以焙烧，随后冷却至室温，将其物质粉碎，混合筛分制得到以Al₂O₃包覆的LiNi_0.5Co_0.2Mn_0.3O₂材料。当包覆的烧结温度为750℃，烧结时间为10 h，包覆量为0.3%时，合成的锂离子电池的综合性能最好，1.0 C容量达到156.3 mAh/g，充放电50次后电池的容量保持率为99.03%，充放电500次后电池的容量保持率为94.55%。

Abstract: High temperature solid state method was employed to prepare target product in this study. First, LiNi_0.5Co_0.2Mn_0.3O₂ Materials were mixed with nano-Al₂O₃ in a certain ratio, then the mixture was calcinated at high temperature. After cooled to room temperature, the product was mechanical crushed to pass through a sieve, and Li(Mn, Co, Ni)O₂ coated with nano-Al₂O₃ was obtained. When the target product was synthesized at 750˚C for 10 h and the nano-Al₂O₃ addition was 0.3%, its comprehensive performance is relatively better, and the initial capacity and capacity retention after 50 cycles are 156.3 mAh/g and 99.03% respectively.