三氧化二铁作为铁源制备碳包覆磷酸铁锂

Preparing carbon coated lithium iron phosphate with ferric oxide as Fe source

以三氧化二铁（Fe2O3）为铁源，葡萄糖为还原剂和碳源，在优化条件[n（Li）：n（Fe）=1．05：1．00，100g前驱体加入1．50g葡萄糖，在650℃下焙烧15h]下制备碳包覆磷酸铁锂（LiFePO4／C）。产物为橄榄石型晶相，无明显的杂质相，振实密度为1．18g／cm^3。在4．2—2．5V循环，0．1C,0.5C,2．0C下的首次放电比容量分别为139．4mAh／g、120．4mAh／g和102．0mAh／g，第30次循环的放电比容量分别为138．0mAh／g、121．9mAh／g和92．4mAh／g，材料的结构没有变化。

Based on the optimization condition[ n （Li） ： n （Fe） = 1.05 ： 1.00, adding 1.50 g glucose into 100 g precursor, sintering at 650 ℃ for 15 hi, by using ferric oxide（Fe2 O3） as Fe source, glucose as deoxidizer and carbon source, carbon coated lithium iron phosphate （LiFePO4/C） was prepared. The product was olivine structure without obvious impurity phase; the tap density was 1.18 mg/cm3 .When cycled in 4.2 - 2.5 V,its initial specific discharge capacity at 0.1 C,0.5 C and 2.0 C was 139.4 mAh/g, 120.4 mAh/g and 102.0 mAh/g, respectively, the specific discharge capacity was 138.0 mAh/g, 121.9 mAh/g and 92.4 mAh/g in the 30th cycle, respectively, there was no structure change occurred in the material.