花状和球形Li_(1.13)[Mn_(0.534)Ni_(0.233)Co_(0.233)]_(0.87)O_2的制备及性能

Synthesis and performance of flower-like and spherical Li_(1.13)[Mn_(0.534)Ni_(0.233)Co_(0.233)]_(0.87)O_2

采用共沉淀法制备氢氧化物前驱体，再在氧气气氛中高温焙烧，制得花状结构和常规球形富锂正极材料Li1.13[Mno．534N‰33c00．23]]0．B702；通过XRD、SEM和恒流充放电测试对样品进行分析。在2．00～4．80V循环，花状与球形富锂材料的0·1C（25mA／g）首次放电比容量分别为298．9mAh／g和277．5mAh／g；在2．50～4．65V循环，2．0c首次放电比容量分别为189．4mAh／g和162．4mAh／g；0．5C循环100次，花状富锂材料的比容量和容量保持率分别为199．6mAh／g和84．7％．球形富锂材料分别为179．8mAh／~和81．7％．花状富锂材料的比夷面教绱大．增加了彘化荤．I主应反墙右别干由觚游溶；

Flower-like structure and spherical lithium-rich materials LiL 13 E Mn0.534 Ni0.233 Co0.233 ]0.87 02 were synthesized by high temperature annealing in oxygen atmosphere with the hydroxide precursors, which were prepared via co-precipitation method. The products were analyzed by XRD, SEM and galvanostatic charge-discharge tests. When cycled in 2.00 ~ 4. 80 V, the initial specific discharge capacities of flower-like and spherical lithium-rich materials were 298. 9 mAh/g and 277. 5 mAlCg at 0. 1 C（25 mA/g） ,res- pectively,when cycled in 2.50 -4. 65 V,the initial specific discharge capacity 189. 4 mAh/g and 162. 4 mAh/g at 2.0 C,respec- tively. After 100 cycles at 0. 5 C,the specific capacity and capacity retention of flower-like lithium-rich materials were 199. 6 mAh/g and 84. 7%, respectively, spherical lithium-rich materials was 179. 8 mAh/g and 81.7%, respectively. Flower-like lithium-rich material had larger specific surface area, increased the electrochemical reaction area and allowed better penetration of electrolyte.