真空高温固相法合成LiFePO4/C纳米复合材料

中国有色金属学报, 2010, 20(7): 1402-1406.

真空高温固相法合成LiFePO4/C纳米复合材料

郭永兴 ^1, , 李新海 ^2, , 王志兴 ^3, , 王红强 ^4,

1.中南大学,冶金科学与工程学院,长沙,410083

2.中南大学,冶金科学与工程学院,长沙,410083

3.中南大学,冶金科学与工程学院,长沙,410083

4.广西师范大学,化学化工学院,桂林,541004

基金项目: 国家重点基础研究发展计划资助项目(2007CB613607) 湖南省科技计划资助项目(2009FJ1002)

关键词：锂离子二次电池 , 磷酸铁锂 , 阴极 , 复合材料 , 纳米材料

LiFePO4/C nano-composites synthesized by vacuum heat solid-phase method

以可溶性锂盐、铁盐及有机碳源为原料,通过真空高温固相合成法,同时得到两种LiFePO4/C纳米复合材料(分别来源于直接固相合成和气相沉积).采用XRD、SEM、TEM及电化学工作站对复合材料的结构及电化学性能进行分析和研究.结果表明:来源于气相沉积的LiFePO4/C复合材料具有良好的结构和电化学性能,LiFePO4颗粒大小为50～200 nm,碳膜的厚度为5～10 nm;在0.05C倍率下放电比容量为170 mA-h/g,接近LiFePO4材料的理论比容量;以1C、2C、5C倍率放电,放电容量分别是理论容量的83%、77%、62%;1C倍率下进行充放电循环50次后,容量衰减只有0.27%,表明材料具有良好的倍率放电性能和循环性能.

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