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.
出处
《电源技术》
CAS
CSCD
北大核心
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)
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
LiFePO4/C cathode material
lithium-ion rechargeable batteries
acetylene black
citric acid
sucrose
carbon coating
