中文摘要：

采用两步加热高温固相法合成了掺杂Nd^3＋的LiFe1-xNdxPO4/C复合材料（x=0，0．01，0．02，0．04，0．06，0．08）。用TG—DSC对前驱体进行分析和SQUID（超导量子干涉仪）对样品中Fe^3＋的磁性测定。优化了合成工艺条件；采用XRD、FE-SEM、EDS等方法分析了样品的结构并对其电化学性能进行了测试。结果表明：LiFe1-xNdxPO4/C复合材料具有橄榄石型结构；当Nd^3＋的掺杂量6％（物质的量分数1、煅烧温度700℃、煅烧时间16h时，样品在0．2C（1C=170．0mA·g^-1）电流密度下的最大放电比容量可达165．2mAh·g^-1，循环100次后的容量保持率仍为92．8％，在1C、2C、5C下的最大放电比容量分别为146．8、125．7和114．8mAh·g^-1。通过测定样品在不同较低倍率下的放电比容量，采用外推法得出制备样品的实测理论比容量为168．7mAh·g^-1。

英文摘要：

LiFe1-xNdxPO4（x=0, 0.01, 0.02, 0.04, 0.06, 0.08） cathode material for Li-ion battery was synthesized by two-step heating solid-state reaction. The synthesis conditions were optimized through the thermal analysis of the precursor by TG-DSC and the magnetic measurement of Fe^3＋in LiFe1-xNdxPO4/C sample by SQUID（Superconducting QUantum Interference Device）. The structure and electrochemical performance of the material were studied by XRD, FE-SEM, EDS and galvanostatic charge-discharge method. The results show that LiFe1-xNdxPO4/C sample has the same olivine structure as LiFePO4 When the dopant of Nd^3＋ is 6%（molar fraction） and precursor is calcined for 16 h at 700 ℃, the sample delivers the highest discharge capacity of 165.2 mAh .g^-1 at 0.2C （1C=170.0 mA·g^-1） rate, and the capacity retention rate is 92.8% after 100 cycles, and 146.8 mAh .g^-1, 125.7 mAh.g^-1, 114.8 mAh·g^-1 at 1, 2, 5 C-rates, respectively. The measured theoretical capacity is about 168.7 mAh·g^-1 by measuring the capacity at various discharge current density and extrapolating to the current density of zero.