尖晶石锰酸锂的表面包覆改性研究  

Research on surface modification of spinel LiMn_2O_4

作　　者：付春明[1] 于晓微[1] 张晓波[1] 夏继平[1] 张春丽[1] 

机构地区：[1]中海油天津化工研究设计院,天津300131

出　　处：《无机盐工业》2014年第4期76-78,共3页Inorganic Chemicals Industry

摘　　要：采用溶胶凝胶法在尖晶石锰酸锂的表面包覆一层二氧化钛,并通过扫描电镜对包覆前后样品的粒径和形貌进行了表征。电化学测试结果表明:二氧化钛包覆层能有效减少锰酸锂和电解液的直接接触,减少锰的溶解,提高材料的电化学稳定性。当二氧化钛包覆量为2%(质量分数)时,样品具有最好的电化学性能,在55℃下1 C充放电循环首次放电比容量为111.4 mA·h/g,循环50次后仍具有101.5 mA·h/g的比容量。The surface of spinel LiMn2O4 was coated with TiO2 layer by sol-gel method.The particle size and morphology of the samples before and after coating were characterized by scanning electron microscopy （ SEM ） .The results of electrochemical performance test showed that the TiO2 layer can obstruct the direct contact between LiMn2O4 and electrolyte and reduce the dissolution of Mn, improving the electrochemical stability of LiMnEO4.The sample coated with 2% （mass fraction） TiO2 showed he best electrochemical performance.The initial discharge specific capacity was 111.4 mA. h/g, and remained at 101.5 mA·h/g after 50 cycles at 1 C rate and 55 ℃.

关 键 词：锰酸锂 TIO2 包覆 电化学性能 

分 类 号：TQ131.11[化学工程—无机化工]