Synthesis and electrochemical properties of Al-doped LiVPO_4F cathode materials for lithium-ion batteries  

作　　者：ZHONG Shengkui YIN Zhoulan WANG Zhixing CHEN Qiyuan 

机构地区：[1]College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China [2]Department of Materials and Chemistry, Guilin University of Technology, Guilin 541004, China [3]School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

出　　处：《Rare Metals》2007年第5期445-449,共5页稀有金属（英文版）

摘　　要：Al-doped LiVPO4F cathode materials LiAlxV1-xPO4F were prepared by two-step reactions based on a car-bothermal reduction （CTR） process. The properties of the Al-doped LiVPO4F were investigated by X-ray diffraction （XRD）,scanning electron microscopy （SEM）,and electrochemical measurements. XRD studies show that the Al-doped LiVPO4F has the same triclinic structure （space group p-↑1 ） as the undoped LiVPO4F. The SEM images exhibit that the particle size of Al-doped LiVPO4F is smaller than that of the undoped LiVPO4F and that the smallest particle size is only about 1 μm. The Al-doped LiVPO4F was evaluated as a cathode material for secondary lithium batteries,and exhibited an improved reversibility and cycleability,which may be attributed to the addition of Al^3＋ ion by stabilizing the triclinic structure.Al-doped LiVPO4F cathode materials LiAlxV1-xPO4F were prepared by two-step reactions based on a car-bothermal reduction （CTR） process. The properties of the Al-doped LiVPO4F were investigated by X-ray diffraction （XRD）,scanning electron microscopy （SEM）,and electrochemical measurements. XRD studies show that the Al-doped LiVPO4F has the same triclinic structure （space group p-↑1 ） as the undoped LiVPO4F. The SEM images exhibit that the particle size of Al-doped LiVPO4F is smaller than that of the undoped LiVPO4F and that the smallest particle size is only about 1 μm. The Al-doped LiVPO4F was evaluated as a cathode material for secondary lithium batteries,and exhibited an improved reversibility and cycleability,which may be attributed to the addition of Al^3＋ ion by stabilizing the triclinic structure.

关 键 词：lithium-ion batteries cathode material LIVPO4F Al-doping carbothermal reduction method cyclic voltammetry （CV） 

分 类 号：TM911[电气工程—电力电子与电力传动]