以FePO4为铁源、Li2CO3为锂源、聚丙烯为还原剂和碳源,采用一步固相法合成原位碳包覆磷酸亚铁锂(LiFePO4/C)复合材料,研究合成温度对材料LiFePO4/C复合材料电化学性能的影响.采用X射线衍射、扫描电镜和拉曼光谱技术对合成产物的晶体结构、表面形貌和碳结构进行表征,通过电化学阻抗谱(EIS)和充放电测试对材料的电化学性能进行测试和分析.结果表明:在600～750 ℃温度范围内都可合成纯LiFePO4/C复合材料,随着合成温度的升高,材料颗粒尺寸和石墨化程度都将增大;600 ℃保温8 h合成的材料颗粒尺寸为100～500 nm,其1 C放电比容量达到144.2 mA·h/g,5 C放电比容量达到119 mA·h/g.
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