摘要
采用共沉淀法合成富锂正极材料Li[Li0.2Mn0.54Ni0.13Co0.13]O2。研究了合成时间、配锂量、焙烧温度及焙烧时间对正极材料电化学性能的影响。研究结果表明在60℃下,合成时间为6 h时制备的Li[Li0.2Mn0.54Ni0.13Co0.13]O2材料具有较高的振实密度和较好的电化学性能。配锂量不仅会影响材料的结构,同时对材料的电化学性能也有一定的影响。研究显示当Li/M(nLi/nM(M=Ni+Co+Mn))为1.25/0.8时,制备材料的首次放电比容量最高。焙烧温度和焙烧时间对Li[Li0.2Mn0.54Ni0.13Co0.13]O2的电化学性能影响很大,焙烧温度为900℃,焙烧时间为15 h得到材料的电化学性能最优。
Li-rich cathode material Li[Li0. 2Mn0. 54Ni0. 13Co0. 13]O2powder was prepared by co-precipitation method. The effects of the synthesis time,the extra Li amount,the calcination temperature and the calcination time on the electrochemical properties of the cathode material were investigated in detail. The results indicate that the Li[Li0. 2Mn0. 54Ni0. 13Co0. 13]O2prepared at 60 ℃ for 6 h have the higher tap density and the better electrochemical performance. Extra Li amount not only causes difference in the material structure,but also affects their electrochemical properties. The highest initial discharge capacity is obtained with the Li / M（ nLi/ nM（ M = Ni ＋ Co ＋ Mn）） of 1. 25 /0. 8. The calcination temperatures and calcination times cause great difference in the electrochemical properties of Li[Li0. 2Mn0. 54Ni0. 13Co0. 13]O2,and the best electrochemical properties are obtained at the calcination temperature of 900 ℃ for 15 h.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第3期769-772,共4页
Journal of Synthetic Crystals
基金
吉林市科技支撑计划项目(2013324003)
