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 LiFePO4/C Microsphere for Secondary Lithium Batteries
作者单位
于 锋 中国科学院理化技术研究所北京 100190
中国科学院研究生院北京 100049 
张敬杰 中国科学院理化技术研究所北京 100190 
杨岩峰 中国科学院理化技术研究所北京 100190 
宋广智 中国科学院理化技术研究所北京 100190 
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800 nm左右,比表面积为2 m2·g-1, 0.1C放电比容量为107.3 mAh·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50 nm左右,比表面积可达32 m2·g-1;在室温下,0.1C和10C首次放电比容量分别为158.8和87.2 mAh·g-1,具有优异的循环性能和高倍率充放电性能。
关键词: LiFePO4/C  正极材料  多孔球形  喷雾干燥-碳热还原法(SDCTM)
基金项目: 
Abstract: Effects of carbon sources on porous LiFePO4/C microsphere were investigated by spray drying and carbothermal method(SDCTM). The results indicate that the defeatured porous LiFePO4/C microsphere obtained using carbon black as inorganic carbon source is with an average size of 800nm , small specific surface area of 2 m2·g-1 and a dischange 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 m2·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.
Keywords: LiFePO4/C  cathode material  porous spherical  spray drying and carbothermal method (SDCTM)
 
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于 锋,张敬杰,杨岩峰,宋广智.不同碳源对多孔球形LiFePO4/C复合材料的影响[J].无机化学学报,2009,25(1):42-46.
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