锂离子电池LiFePO_4正极材料电化学性能改进  

Electrochemical performance improvement of LiFePO_4 cathode material

作　　者：王武林[1] 刘兴泉[1,2] 王亮[1] 张真[1] 何泽珍[1,2] 

机构地区：[1]电子科技大学微电子与固体电子学院,四川成都610054 [2]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：《电源技术》2011年第3期255-258,共4页Chinese Journal of Power Sources

基　　金：河南省新乡市群力电源材料有限公司与新乡市天力能源材料有限公司的资助(H04010301W0309119)

摘　　要：为了改进LiFePO4材料的电化学性能,以乙炔黑、柠檬酸、蔗糖三种物质作为碳源,采用高温固相法制备了LiFe-PO4、LiFePO4/C复合正极材料。通过XRD、SEM、CV测试和恒电流充放电等方法研究了材料的结构与电化学性能。测试结果显示,采用蔗糖为碳源制备的LiFePO4/C材料具有最好的充放电性能。在室温和0.2 C倍率下,碳源为乙炔黑、柠檬酸和蔗糖的首次放电比容量分别为109.4、130.4、140.4 mAh/g。当包覆不同的含碳量时,LiFePO4/C的性能有明显的差别。在0.2 C和25℃时,当碳包覆量为5%时,LiFePO4/C材料的最高放电比容量高达154.3 mAh/g。In order to improve the electrochemical performance of LiFePO4,LiFePO4/C composite was synthesized via solid-state reaction with three types of carbon sources： acetylene black,citric acid and sucrose.The structure and electrochemical properties of LiFePO4/C composite were characterized by XRD,SEM,CV test and galvanostatic charge and discharge.The results indicate that LiFePO4/C composite prepared with sucrose as the carbon source exhibits excellent charge-discharge properties.At the discharge rate of 0.2 C,the initial discharge capacity of LiFePO4/C was 109.4,130.4 mAh/g and 140.4 mAh/g with the acetylene black,citric acid and sucrose as carbon sources respectively at room temperature.With the different contents of sucrose,the performance of LiFePO4/C has obvious distinction.When adding carbon for 5%,the material has the highest discharge capacity of 154.3 mAh/g at 0.2 C at room temperature.

关 键 词：LIFEPO4/C正极材料 锂离子电池 乙炔黑 柠檬酸 蔗糖 碳包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动]