碳热还原法制备LiFePO_4/C正极材料的复合掺碳研究  

Research of composite carbon source in carbonthermal reduction method to synthesize LiFePO_4/C cathod materials

作　　者：胡静[1] 冯哲圣[1] 王焱[1] 陈金菊[1] 王小军[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《电子元件与材料》2013年第11期23-26,共4页Electronic Components And Materials

基　　金：中央高校基本科研业务资助项目(No.ZYGX2010X008);四川省科技支撑计划资助项目(No.2012GZ0002)

摘　　要：以葡萄糖和乙炔黑为复合碳源、廉价的Fe2O3为铁源,采用碳热还原法制备了锂离子电池正极材料LiFePO4/C;并通过XRD、SEM、Raman分析和恒流充放电测试研究了所制得样品的物相、形貌、结构和电性能特性。研究结果表明,当葡萄糖和乙炔黑中所含碳元素的质量比为1:1时,所制备的正极材料具有最优的性能,在0.1C倍率下,其放电比容量为152.5 mAh/g,且在不同倍率下循环24次后,其0.1C倍率下的放电比容量仍能达到148.8mAh/g,容量保持率为97.6%。LiFePO4/C cathode materials acetylene black as composite carbon source were synthesized by carbonthermal reduction method using glucose and and low cost Fe2O3 as iron source. The phase, morphology, structure and electrochemical properties of the prepared samples were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, Raman spectra and galvanostatic charge and discharge tests. The research results demonstrate that when the mass ratio of carbon in glucose and acetylene black is 1：I, the prepared LiFePO4/C composites possess the best performance and show discharge capacity of 152.5 mAh/g at 0.1 C. After 24 cycles tests at different rates, the discharge capacity at 0.1 C is 148.8 mAh/g and the capacity retention rate is 97.6%.

关 键 词：锂离子电池 正极材料 LIFEPO4 C 碳热还原法 复合碳源 葡萄糖 乙炔黑 

分 类 号：TM912.9[电气工程—电力电子与电力传动]