结合共沉淀原理和腐蚀电化学原理,提出了一种合成LiFePO4的新方法.对新方法合成路线中的反应物、添加物以及热处理条件作了实验分析,并用XRD分析了LiFePO4的晶体结构和晶粒尺寸分布,用SEM分析了形貌,用充放电测试技术分析了材料的比容量及其电化学性能.结果表明:新方法在合成中不引入其它杂质离子,避免了常规共沉淀合成工艺中过滤.洗涤等过程对LiFePO4前驱体的不利影响.用新方法制备的LiFePO4晶粒分布在20-70 nm,在0.1C下首次放电容量为147 mAh/g.新方法有利于对LiFePO4的Mg2+掺杂改性,明显地提高LiFe1-xMgxPO4的电化学性能.
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