以聚丙烯酰胺(PAM)作为分散剂,采用液相控制结晶-碳热还原法制备LiFePO4/C正极材料,考察了PAM对LiFePO4/C正极材料性能的影响,采用热化学分析、X射线衍射、扫描电镜、碳含量分析和充放电测试等分析测试手段对材料进行表征.结果表明,将PAM溶于酸液中且添加量为1.5wt％时制备的LiFePO4平均粒径约为100 nm,颗粒分散较为均匀;该材料在0.1C、1C、2C、5C和10C倍率下首次放电比容量分别为153.8、142.5、138.4、128.7和124.3mAh/g,1C倍率下循环100次后容量保持率仍在99％以上;交流阻抗分析表明:1.5wt％PAM改性后的材料的各种阻抗值均降低,锂离子的导电速率提高了28倍.PAM改性后的LiFePO4/C正极材料的离子及电子导电性提高了,具有优良的倍率性能与循环性能,有利于大规模推广应用.
参考文献
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