球磨EMD对熔融浸渍法合成锰酸锂的影响  

Effects of ball-milling EMD on lithium manganese oxide synthesized via melt-impregnation method

作　　者：刘宏基[1] 刘兴泉[1] 王超[1] 向小春[1] 

机构地区：[1]电子科技大学微电子与固体电子学院电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《电池》2011年第6期297-300,共4页Battery Bimonthly

基　　金：国家自然科学基金项目(21071026);电子科技大学杰出人才引进计划资助项目(08JC00303)

摘　　要：对锰源工业电解二氧化锰（EMD）进行人工研磨或球磨处理,再以熔融浸渍法合成锰酸锂（LiMn2O4）正极材料。对制备的LiMn2O4进行SEM、XRD和电化学性能分析,考察球磨时间对EMD粒径和形貌的影响。球磨处理EMD能改善LiMn2O4的电化学性能,当球磨时间为8 h时,产物的晶粒大小均匀,结晶度较高。在3.40~4.35 V以0.5C充放电的首次放电比容量达115.3 mAh/g,循环20次的容量保持率为95.5%。Manganese source industrial electrolytic manganese dioxide （EMD） was treated by manual grinding or ball-milling, lithium manganese oxide （LiMn2O4） cathode materials were synthesized by melt-impregnation method. The prepared LiMn2O4 was analyzed by SEM, XRD and electrochemical performance to investigate the effects of ball-milling time on the grain size and morphology of EMD.Ball-milling treating to EMD could improve the electrochemical performance of LiMn2O4. When the ball- milling time was 8 h, the product had a uniform partical size and high degree of crystallinity, the 0.5 C initial specific discharge capacity was 115.3 mAh/g when charged-discharged at 3.40 - 4.35 V, the capacity retention after 20 cycles was 95.5 %.

关 键 词：尖晶石 锰酸锂(LiMn2O4) 熔融浸渍法 球磨 正极材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动]