LiMn_2O_4薄膜的快速退火制备及其性质  

Preparation and Characterization of LiMn_2O_4 Thin Films by Rapid Thermal Annealing

作　　者：吴显明[1] 何则强[1] 麻明友[1] 肖卓炳[1] 许名飞[2] 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000 [2]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《精细化工》2006年第3期285-289,共5页Fine Chemicals

基　　金：湖南省自然科学基金资助项目(No:04JJ40038);湖南省教育厅资助项目(No:04C475)~~

摘　　要：为了获得电化学性能优良的锂离子薄膜电池正极材料,采用快速退火技术制备L iMn2O4薄膜,用X射线衍射、扫描电子显微镜检测和分析了薄膜的物相及表面形貌;用循环伏安、恒流充放电研究了L iMn2O4薄膜的电化学性质。结果表明,制备的L iMn2O4薄膜均匀、致密、无龟裂;在退火温度从700℃升高到850℃的过程中,薄膜容量从34μAh/(cm2.μm)逐步升高到40μAh/(cm2.μm);当退火时间从1 m in延长到4 m in时,薄膜容量由36μAh/(cm2.μm)升高到41μAh/(cm2.μm),但当退火时间进一步延长到8 m in时,薄膜容量下降到39.5μAh/(cm2.μm);对于不同温度退火2 m in制备的薄膜而言,800℃退火得到的L iMn2O4薄膜经100次循环后的每次容量损失为0.021%,循环性能最好;对于750℃不同退火时间制备的L iMn2O4薄膜来说,退火时间为4 m in时得到的薄膜循环性能最好,经100次循环后每次容量损失仅为0.025%,表明快速退火制备的L iMn2O4薄膜具有优良的循环性能。Cathode material LiMn2O4 identification and study of surface electron microscopy. Electrochemical thin films were prepared morphology were carried properties were examined rapid thermal annealing. The phase by X-ray diffraction and scanning cyclic vohammetry and galvanostatic charge-discharge experiments. The results show that the film prepared by this method is homogeneous, dense and crack-free. The capacity of the film increases from 34 μAh/（ cm^2·μm） to 40 μAh/（ cm^2·μm ） as the annealing temperature increaes from 700 ℃ to 850 ℃, and from 36 μAh/（ cm^2A·μm） to 41 μ Ah/（ cm^2·μm） as annealing time increases from 1 minute to 4 minutes. However, when the annealing time reaches 8 minutes, the capacity decreases to 39. 5μAh/（ cm^2·μm）. For the thin films annealed for 2 minutes at different temperature, the film annealed at 750℃ has the best cycling behavior with a capacity loss of 0. 021% per cycle after being cycled 100 times. While for the thin films annealed at 750 ℃ for different time, the film annealed for 4 minutes has the best cycling behavior with a capacity loss of 0. 025% per cycle after being cycled 100 times. These show that LiMn2O4 thin film prepared by rapid thermal annealing possesses excellent cycling behavior.

关 键 词：锂离子 薄膜 电化学 循环伏安 

分 类 号：TM912.9[电气工程—电力电子与电力传动]