以氧化铁和磷酸二氢锂为原料,采用碳热还原法制备磷酸铁锂正极材料.用热重-差热分析(TG-DSC)、X射线衍射(XRD)、扫描电镜(SEM)等方法来表征反应中间产物性质,分析研究碳热还原制备磷酸铁锂的反应机制,并通过分光光度法测定反应过程中亚铁离子含量.研究结果表明:该反应过程主要可分为三个阶段,第一为室温～200℃低温阶段,在此阶段Fe203被还原成Fe304;第二为200～600℃中温阶段,在400℃左右Fe3O4进一步被还原为FeO;第三为600～800℃高温阶段,在600℃之后F∞与磷酸二氢锂发生置换反应生成磷酸铁锂.
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