LiFePO₄电极的倍率特性与材料的粒度和电子导电性有很大关系. 采用共沉淀方法，调控预处理温度，将3种不同尺寸的FePO₄前驱体通过表面修饰对-羟基苯甲酸的聚合物，可合成不同尺度的LiFePO₄/C材料，分别为80 nm、200 nm和 1 μm. 纳米尺度LiFePO₄-a/C电极，30C放电比容量达到了100 mAh·g^-1，而微米级LiFePO₄-c/C电极放电比容量仅为54 mAh·g^-1. 均一碳包覆的LiFePO₄/C电极表现出强抗氧化性，不仅提高其导电性，还可防止材料氧化.

We adopted an effective route to prepare the particle size controllable core-shell structure carbon-coated LiFePO4 from different sized FePO4 precursors, varying from 80 nm, 200 nm and 1 μm by an in situ polymerization method integrated with a surface modification technology. The discharge capacities of the three sized LiFePO₄/C are, respectively, 162 mAh·g^-1, 142 mAh·g^-1 and 92 mAh·g^-1 at 0.1C rate. The nano-sized LiFePO₄-a/C (80 nm) delivers a discharge capacity as large as 100 mAh·g^-1 even at 30C, while the macroscopic LiFePO₄-c/C (1 μm) exhibits a much poorer discharge capacity of 54 mAh·g^-1 under the same current density. The carbon coated LiFePO₄ (LiFePO₄/C) also shows good chemical stability after the exposure to air atmosphere, in which the uniform carbon layer could prevent the LiFePO₄ from reacting with H₂O and O₂.