摘要
采用静电喷射沉积法 (Electrostaticspraydeposition ,ESD)制备了LiCoO2 /LiMn2 O4复合薄膜。X射线衍射结果表明 ,所制备的LiMn2 O4膜均为尖晶石型。俄歇电子谱测试结果表明 ,一步沉积法制备的LiCoO2 /LiMn2 O4复合膜中 ,Co向本体扩散形成Co掺杂LiMn2 O4;分步沉积法制备的样品Co分布在LiMn2 O4表面。电化学实验结果表明 ,表面包覆LiCoO2 可以改善LiMn2 O4膜在高温下的循环稳定性 ,分步沉积法制备的样品性能优于一步沉积法制备的样品 ,且高倍率放电能力增强。对电极改性的机理作了进一步探讨。
LiCoO 2/LiMn 2O 4 thin film electrode was prepared by an electrostatic spray deposition(ESD) technique. The XRD results indicated the formation of a single spinel phase in all LiMn 2O 4 films. AES analysis revealed that LiCoO 2/LiMn 2O 4 film prepared by one-step deposition changed to Co-doping LiMn 2O 4 film due to the diffusion of Co, and LiCoO 2 remained on the surface of LiMn 2O 4 in LiCoO 2/LiMn 2O 4 film prepared by multi-step deposition. The electrochemical experiement results showed improved cycling stability of LiCoO 2/LiMn 2O 4 film at 55 ℃. The LiCoO 2/LiMn 2O 4 film prepared by multi-step deposition exhibited more superior performance at 55 ℃ than the sample prepared by one-step deposition and improved rate capability. The mechanism of the improvement of the performance of LiMn 2O 4 film by coating with LiCoO 2 was discussed.
出处
《应用化学》
CAS
CSCD
北大核心
2004年第7期678-682,共5页
Chinese Journal of Applied Chemistry
基金
教育部留学回国人员科研启动基金资助项目
