摘要
用化学沉积法,在尖晶石Li1.1Mn1.9O4表面包覆FePO4。用XRD、SEM和充放电测试,分析了包覆前后的材料。Fe-PO4包覆量为5%的Li1.1Mn1.9O4在高温（55℃）下以1 mA在3.0~4.3 V循环30次,容量损失率为6.75%,低于包覆前的26.52%,原因是FePO4薄膜隔离了电解液和正极材料。FePO4均匀包覆在表面,没有改变Li1.1Mn1.9O4的结构。
FePO4 was coated on the surface Of spinel Li1.1Mn1.9O4 by chemical deposition method. The materials before and after coating were analyzed by XRD, SEM and charge-discharge tests. The capacity loss ratio of Li1.1M n1.9 O4 coated 5 % FePO4 was 6.75% when cycled 30 times at 3.0- 4.3 V with 1 mA under high temperature （55 ℃）,smaller than 26.52% of before coating. The reason was that the FePO4 thin film separated electrolyte and cathode material. FePO4 coated on the surface uniformly did not change the structure of Li1.1Mn1.9 O4.
出处
《电池》
CAS
CSCD
北大核心
2010年第5期253-255,共3页
Battery Bimonthly
关键词
正极材料
高温
循环性能
包覆
磷酸铁(FePO4)
cathode material
high temperature
cycle performance
coating
iron phosphate（FePO4）
