正极材料LiFePO_4的电化学性能的改进  

Improving Electrochemical Performance of LiFePO_4 as a Cathode Material

作　　者：胡环宇[1] 仇卫华[1] 李发喜[1] 赵海雷[1] 王碧燕[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2003年第6期549-552,共4页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金(No.50272012)

摘　　要：采用固相反应法合成了LiFePO_4正极材料。在20mA/g的电流密度下进行恒电流充放电,比容量可以达到135mAh/g。为了改进LiFePO_4的性能,提高其高倍率性能,尝试了两种途径并合成出Li(Fe_(0.8)Mn_(0.2))PO_4和LiFePO_4/C。低倍率充放电实验得出的两个样品的比容量分别可达到145mAh/g和144mAh/g,而且表现出了良好的循环性能和平坦的电压平台。以上两种方法制备出的材料均具有较好的高倍率性能。LiFePO4 was synthesized by solid state reaction. A reversible capacity of 125-138 mAh/g was achieved under a low current density of 20 mA/g at room temperature. In order to improve the electrochemical performance of the material, Li(Fe0.8Mn0.2)PO4 and LiFePO4/C were prepared, respectively. The charge-discharge experiment of the samples showed that the capacities were 145 mAh/g and 144 mAh/g, respectively. They both had a good voltage plateau and exhibited wonderful high current properties.

关 键 词：正极材料 电化学性能 锂离子电池 磷酸铁锂 固相反应法 

分 类 号：TM912[电气工程—电力电子与电力传动]