中文摘要：

在溶液中制备FePO4·2H2O前驱体，利用氢气还原法于650℃制得了锂离子电池正极材料LiFePO4，并对其进行了包覆和掺杂。采用X射线衍射法（XRD）、扫描电镜法（SEM）、循环伏安法（GV）、交流阻抗法（EIS）及充放电测试对材料进行了结构表征和电化学性能测试。结果表明，该方法制得的材料具有单一的橄榄石结构，样品形貌规则、颗粒均匀。包覆碳和掺镁后，材料具有较低的阻抗及较高的首次放电比容量，LiFePO4、LiFePO4／C、LiMg0.01Fe0.99PO4／C的首次放电比容量分别为125．09mA·h／g、139．17mA·h／g、146．97mA·h／g。

英文摘要：

LiFePO4 materials are prepared by hydrogenous reduction（a method of preparing LiFePO4 material with prue H2 gas as protective and reducing gas） with FePO4 · 2H2O. The samples are characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, cycle voltammetry（C-V） and electrochemical performance testing. The results show that materials with a single olivine structure, rules of the sample morphology and particle uniformity. It has a lower post-impedance, and higher initial discharge capacity after coated with carbon and magnesium-doped （LiFePO4 125.09mA · h/g, LiFePO4/C 139. 17mA · h/g and LiMg0.01Fe0.99PO4/C 146. 97mA · h/g）.