中文摘要：

以五氧化二钒干凝胶、碳酸锰、磷酸二氢铵、碳酸锂、乙炔黑为原料，采用固相法在相对较低的温度条件下合成了xLiMnPO_4·yLi_3V_2（PO_4）_3锂离子电池复合正极材料。采用X射线衍射（XRD）、扫描电镜（SEM）对其晶体结构和表面形貌进行表征。结果表明，750℃下烧结15h合成的3LiMnPO_4·Li_3V_2（PO_4）_3为结晶良好的两相结构，颗粒粒径较小且分布比较均匀，其在室温、0．2C倍率下首次充放电容量分别为144．8mAh／g和139．8mAh／g，循环50次后容量为130．5mAh／g。

英文摘要：

xLiMnPO_4·yLi_3V_2（PO_4）_3 composite as a cathode material for lithium ion batteries were synthesized via a solid-state method at relatively low temperature using vanadium pentoxide xerogel, manganous carbonate, ammonium dihydrogen phosphate, lithium carbonate as raw materials and acetylene black as carbon source. Crystal structure and morphology of the composite were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）. The results indicate that the 3LiMnPO_4·Li_3V_2（PO_4）_3 composite was well crystallized as a two-phase structure at annealing temperature of 750 ℃ for 15 h. The 3LiMnPO_4·Li_3V_2（PO_4）_3 mieropartieles had relatively small panicle sizes with uniform distribution. The initial charge and discharge capacity of 3LiMnPO_4·Li_3V_2（PO_4）_3 were 144.8 mAh/g and 139.8 mAh/g at rates of 0.2 C under room temperature, respectively. The capacity retention kept 130.5 mAh/g after 50 cycles.