FePO_4的制备及其在锂电池中的应用

Perparation of Ferri Phosphate and Its Application to Lithium Battery

采用不同的方法制备磷酸高铁 ,对其在锂金属二次电池中的充放电比容量进行测定 ,研究不同煅烧温度对其性能的影响 .通过机械研磨的方法 ,获得高比容量的 Fe PO4样品 .在电流密度为 0 .13m A· cm-2 时 ,首次放电比容量达 132 .0 m A· h· g-1.通过实验证明 ,结晶状磷酸高铁也可以获得具有与无定形磷酸高铁相近的充放电容量 .该方法提供一种原料价格低廉、制造简单和充放电容量高的正极活性材料 。

Ferri phasphate was prepared by adopting different methods; and its charging discharging specific capacity in lithium storage battery was determined; and the effect of different calcining heat on its performance was studied, By the method of mechanical grinding, a ferri phosphate sample of high specific capacity was obtained. The first discharging specific capacity of 132.0 mA·h·g -1 was attained along with a current density of 0.13 mA·cm -2 . Crystal ferri phosphaste may have the charging discharging capacity approaching that of amorphous ferri phosphate, as proved by the experiment. This method provides an cathode active material of cheap in price of raw material and simple in preparation and high in charging discharging capacity. Its application to lithium battery can be aspired.