水热法制备LiMnPO_4包覆的LiMn_2O_4正极材料及其改善的电化学特性  

Improvement of Electrochemical Properties of LiMn_2O_4 Cathode Material by LiMnPO_4 Coating via Hydrothermal Method

作　　者：仇光超[1,2] 夏丙波[2] 孙洪丹[2] 方国清[2] 刘伟伟[2] 李德成[2] 魏杰[1] 

机构地区：[1]苏州科技学院化学与生物工程学院,苏州215009 [2]苏州大学化学电源研究所,江苏省锂离子电池材料重点实验室,苏州225300

出　　处：《无机化学学报》2013年第3期437-443,共7页Chinese Journal of Inorganic Chemistry

基　　金：江苏省"青蓝工程";江苏省"六大人才高峰";江苏省高校优势学科建设工程资助项目

摘　　要：通过水热合成的方法制备了不同质量百分比的LiMnPO4包覆LiMn2O4的复合材料,并且利用XRD、拉曼光谱、SEM、TEM以及充放电测试等手段,对其结构和电化学性能进行了表征。研究表明,适当量的LiMnPO4包覆,不仅可以增加材料的可逆比容量,还可以有效提高材料在55℃下的循环特性。1wt%LiMnPO4包覆的LiMn2O4在55℃下的可逆容量为109 mAh.g-1,是其初始容量的96%。此外,1wt%LiMnPO4包覆的LiMn2O4与未包覆的LiMn2O4相比,在倍率特性上也有明显的改善。LiMnPO4 coated LiMn2O4 with different contents were prepared via hydrothermal method, and their structural and electrochemical properties were characterized by XRD, Raman, SEM, TEM and charge-discharge test. Generally, the modification of LiMnPO4 on the surface of the LiMn2O4 could not only increase the reversible capacity, but also upgrade its cyclic performances when cells were operated at 55 ℃. In the case of the 1wt% LiMnPO4 coated LiMn2O4, its reversible capacity is about 109 mAh·g^-1 when cell was operated at 55 ℃, which is about 96% of its initial capacity. Moreover, 1wt% LiMnPO4 coated LiMn2O4 exhibits an improved rate capability compared with that of the bare LiMn2O4.

关 键 词：水热法 锂离子电池 LIMNPO4 包覆 LIMN2O4 高温特性 

分 类 号：TM911[电气工程—电力电子与电力传动] O646[理学—物理化学]