合成条件对LiNi_(0.5)Co_(0.5)O_2结构和性能的影响

Effects of synthesis conditions on the structure and performance of LiNi_(0.5)Co_(0.5)O_2

以聚丙烯酰胺（PAM）为模板剂，用微波加热法合成了锂离子电池层状正极材料LiNi0．5Co0．5O2。通过SEM、激光粒度分析和XRD等技术，研究了PAM和微波处理对材料的形貌、粒度和晶相结构的影响。结果表明：PAM可以有效地控制材料的形貌及粒度。充放电测试表明：在3．0-4．3V电压范围内，充放电倍率为0．2C，PAM用量为原材料总质量的2％时，材料的放电比容量达154mAh/g；除首次循环外，前10次循环的充放电效率平均在98．5％以上。

Layered cathode material LiNi0.5 Co0.5O2 for Li-ion battery was prepared by microwave heating method using polyacrylamide（PAM） as template. The effects of PAM and microwave treatment on the morphology, particle size and crystal structure of the material were characterized by SEM ,laser particle size analysis and XRD techniques. The results showed that the morphology and particle size of the material could be controlled efficiently by PAM. The charge-discharge test showed that the specific discharge capacity was 154 mAh/g in the voltage range of 3.0 - 4.3 V at 0.2 C rate when the quantity of PAM was 2% of the total mass of raw materials. The average charge-discharge efficiency of the first 10 cycles was above 98.5 % except the initial cycle.