Electrochemical performances of LiFePO_4/C composites prepared by molten salt method  

作　　者：陈召勇 朱伟 朱华丽 张建利 李奇峰 

机构地区：[1]College of Physics and Electronic Science,Changsha University of Science and Technology

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第5期809-813,共5页中国有色金属学报（英文版）

基　　金：Project(06B002) supported by the Scientific Research Fund of Hunan Provincial Education Department of China;Project(09JJ3092) supported by the Natural Science Foundation of Hunan Province,China;Project(2008FJ3008) supported by the Planned Science and Technology Project of Hunan Province,China

摘　　要：LiFePO4/C composites were synthesized by a molten salt (MS) method using the mixture of LiCl,LiOH and NaCl.The prepared LiFePO4/C composites are characterized by X-ray diffractometry (XRD),field emission scanning electron microscopy (FESEM) and charge-discharge test.XRD patterns indicate that LiFePO4 prepared in the temperature range of 550-700 ℃ crystallizes well in an olivine-type structure.Through FESEM images,the sphere-like and homogeneous particles of 0.2 μm can be observed.The charge-discharge test shows that the materials prepared at 600 ℃ for 12 h have good electrochemical performance.At the rates of 0.2C (34 mA/g) and 0.5C,the discharge capacities are 144.6 and 122.3 mA·h/g,respectively,together with good cycle performances.LiFePO4/C composites were synthesized by a molten salt （MS） method using the mixture of LiCl,LiOH and NaCl.The prepared LiFePO4/C composites are characterized by X-ray diffractometry （XRD）,field emission scanning electron microscopy （FESEM） and charge-discharge test.XRD patterns indicate that LiFePO4 prepared in the temperature range of 550-700 ℃ crystallizes well in an olivine-type structure.Through FESEM images,the sphere-like and homogeneous particles of 0.2 μm can be observed.The charge-discharge test shows that the materials prepared at 600 ℃ for 12 h have good electrochemical performance.At the rates of 0.2C （34 mA/g） and 0.5C,the discharge capacities are 144.6 and 122.3 mA·h/g,respectively,together with good cycle performances.

关 键 词：lithium iron phosphate molten salt method cathode material Li-ion batteries 

分 类 号：O614.111[理学—无机化学]