以柠檬酸为碳源、草酸亚铁为铁源、乙酸镁为镁源，采用喷雾干燥–碳热还原法制备了一系列镁离子掺杂磷酸铁锂(LiMg_x Fe_1－x PO₄ /C)材料，并研究了镁离子对喷雾干燥 － 碳热还原法制备的球形磷酸铁锂材料结构和电化学性能的影响． 结果表明，实验制得的 LiMg_x Fe_1－x PO₄ /C 材料具有规则的球形空心结构和高的比容量;当 Mg²⁺含量较小时其对磷酸铁锂晶体结构不产生影响，其中 LiMg_0.04 Fe_0.96 PO₄ /C 具有最好的充放电性能，在0． 2C、0． 5C、1． 0C、2． 0C、5． 0C 倍率下首次放电比容量分别为 149． 0、145． 6、141． 3、132． 6、123． 3mAh/g，1． 0C 倍率下充放电循环 100 周后容量保持率大于 97． 3%．

Spherical LiFePO₄ /C  doped with Mg²⁺ (namely LiMg_x Fe_1－x PO₄ /C) was prepared by means of the spray drying-carbonthermal reduction,with citric acid,ferrous oxalate and magnesium acetate as the carbon source,the iron source and the magnesium source,respectively.Then,the effects of Mg²⁺ doping on the structure and electrochemical performance of the prepared LiFePO₄ /C material were investigated.The results indicate that (1) LiMg_x Fe_1－x PO₄ /C possesses a hollow ball-shaped structure and a high specific capacity; (2) the crystal struc- ture of lithium iron phosphate keeps unchanged at a low Mg²⁺ dosage; and (3) LiMg_0.04 Fe_0.96 PO₄ /C possesses the best charge/discharge performance.For instance，its initial discharge capacities are 149. 0,145. 6,141. 3,132. 6 and 123. 3mAh/g at the rates of 0. 2C,0. 5C，1. 0C,2. 0C and 5. 0 C,respectively; and the capacity retention ra- tio of LiMg_0.04 Fe_0.96 PO₄ /C at 1. 0C keeps more than 97. 3% after 100 charge-discharge cycles.