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.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
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)
