摘要
采用载体转移工艺制备TiO2包覆的LiMn2O4。通过XRD、SEM和电化学性能测试,研究载体转移工艺对产物的影响。TiO2与载体C的质量比为3∶7、在500℃下焙烧6 h所制备的包覆材料电化学性能较好,以50 mA/g的电流在3.5～4.3 V充放电,首次放电比容量为111.5 mAh/g,高于纯LiMn2O4的103.8 mAh/g,第50次循环时仍有103.2 mAh/g。TiO2包覆的LiMn2O4为立方尖晶石结构,颗粒表面变得粗糙;包覆的TiO2可抑制LiMn2O4在循环过程中电化学阻抗的增加。
TiO2-coated LiMn2O4 was prepared via carrier transfer process.The effect of carrier transfer process on the product was studied by XRD,SEM and electrochemical performance tests.The coating material,of with the mass ratio of TiO2 and the carrier carbon was 3∶7,had fine electrochemical performance after calcining at 500 ℃ for 6 h.When charged-discharged at the current of 50 mA/g in 3.5～4.3 V,the initial specific discharge capacity was 111.5 mAh/g,which was higher than that of pure LiMn2O4（103.8 mAh/g）,still had 103.2 mAh/g at the 50 th cycle.TiO2-coated LiMn2O4 was spinel structure,the surface became roughly,the coated TiO2 could suppress the increasing of electrochemical impedance of LiMn2O4 during cycling.
出处
《电池》
CAS
CSCD
北大核心
2011年第2期97-100,共4页
Battery Bimonthly
关键词
LIMN2O4
载体转移法
TIO2
包覆
lithium manganate（LiMn2O4）
carrier transfer method
titanium dioxide（TiO2）
coated
