中文摘要：

橄榄石型LiFePO4是一种新型锂离子电池正极材料。选取Ga^3＋、Ti^4＋、Ta^5＋和Mo^6＋在LiFePO4的Fe（M2）位掺杂,以探讨掺杂离子的价态对试样电化学性能的影响。通过X射线衍射（XRD）、电化学阻抗谱（EIS）以及电化学测试表明,掺杂Ti^4＋的样品具有最好的电化学性能。

英文摘要：

Olivine LiFePO. is a new kind of cathode material for lithium-ion batteries Four kinds of metallic ions Ga^3＋ Ti^4＋, Ta^5＋ and Mo^6＋ were doped in Fe （M2） site in order to investigate the effects of doping ionic valencies on the electrochemical performance of LiFePO4 The results of X-ray diffraction （XRD）, electrochemical impedance spectroscopy （EIS） and electrochemical performance demonstrate that the doped Ti^4＋ material has the best electrochemical performance