Al_2O_3 coating for improving thermal stability performance of manganese spinel battery  

作　　者：刘云建 郭华军 李新海 

机构地区：[1]School of Materials Science and Engineering, Jiangsu University [2]School of Metallurgical Science and Engineering, Central South University

出　　处：《Journal of Central South University》2011年第6期1844-1848,共5页中南大学学报（英文版）

基　　金：Project(10JDG041) supported by the Advanced Person Fund of Jiangsu University, China;Project(2007CB613607) supported by the National Basic Research Program of China

摘　　要：The synthesis of Al2O3-coated and uncoated LiMn2O4 by solid-state method and fabrication of LiMn2O4/graphite battery were described. The structure and morphology of the powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The electrochemical and overcharge performances of Al2O3-coated and uncoated LiMn2O4 batteries were investigated and compared. The uncoated LiMn2O4 battery shows capacity loss of 16.5% after 200 cycles, and the coated LiMn2O4 battery only shows 12.5% after 200 cycles. The uncoated LiMn2O4 battery explodes and creates carbon, MnO, and Li2CO3 after 3C/10 V overcharged test, while the coated LiMn2O4 battery passes the test. The steadier structure, polarization of electrode and modified layer are responsible for the safety performance.The synthesis of Al2O3-coated and uncoated LiMn2O4 by solid-state method and fabrication of LiMn2O4/graphite battery were described. The structure and morphology of the powders were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）, respectively. The electrochemical and overcharge performances of Al2O3-coated and uncoated LiMn2O4 batteries were investigated and compared. The uncoated LiMn2O4 battery shows capacity loss of 16.5% after 200 cycles, and the coated LiMn2O4 battery only shows 12.5% after 200 cycles. The uncoated LiMn2O4 battery explodes and creates carbon, MnO, and Li2CO3 after 3C/10 V overcharged test, while the coated LiMn2O4 battery passes the test. The steadier structure, polarization of electrode and modified layer are responsible for the safety performance.

关 键 词：LiMn2O4 battery Al2O3 coating overcharge test cyclic performance 

分 类 号：TM912[电气工程—电力电子与电力传动]