不同碳源对多孔球形LiFePO4/C复合材料的影响  

Effects of Carbon Sources on Properties of Porous LiFePO_4/C Microsphere for Secondary Lithium Batteries

作　　者：于锋[1,2] 张敬杰[1] 杨岩峰[1] 宋广智[1] 

机构地区：[1]中国科学院理化技术研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《无机化学学报》2009年第1期42-46,共5页Chinese Journal of Inorganic Chemistry

摘　　要：采用喷雾干燥-碳热还原法(SDCTM),分别研究了无机和有机碳源对锂离子正极材料LiFePO4/C形貌、结构及其充放电性能的影响。结果表明:以无机碳源炭黑制备的LiFePO4/C呈不规则球形,一次颗粒粒径在800nm左右,比表面积为2m2·g-1,0.1C放电比容量为107.3mAh·g-1。而以有机碳源制备的LiFePO4/C,其形貌较为规则,呈多孔球形结构,具有较高的比表面积和放电比容量。其中,以柠檬酸为碳源制备的多孔球形LiFePO4/C复合材料,其孔径均在50nm左右,比表面积可达32m2·g-1;在室温下,0.1C和10C首次放电比容量分别为158.8和87.2mAh·g-1,具有优异的循环性能和高倍率充放电性能。Effects of carbon sources on porous LiFePO4/C microsphere were investigated by spray drying and carbotbermal method （SDCTM）. The results indicate that the defeatured porous LiFePO4/C mierosphere obtained using carbon black as inorganic carbon source is with an average size of 800nm , small specific surface area of 2 m^2.g^-1 and a disehange capacing of 107.3 mAh.g^-1 at 0.1C. However, the uniform porous LiFePO4/C microsphere was prepared using organic carbon sources. The regular porous LiFePO4/C microsphere has the average pore size of 50 nm and gives large specific surface area （32 m^2.g^-1） with citric acid. It presents large reversible capacity of 158.8 mAh.g^-1 with 0.1C, even high rate capacity of 87.2 mAh.g^-1 with 10C at room temperature.

关 键 词：LIFEPO4/C 正极材料 多孔球形 喷雾干燥-碳热还原法(SDCTM) 

分 类 号：O613.71[理学—无机化学] O614.111[理学—化学]