本发明公开一种金属元素掺杂锂离子电池用磷酸钒锂正极材料的制备方法，先按Li : V : M : P : C的摩尔比为3 : x : (2?x) : 3 : 5称取锂源、钒源、磷酸盐、掺杂金属源、碳源，以分散剂进行分散球磨；将球磨后的物料转移至水热反应釜中，在120?200℃温度下反应5?10h，真空烘干，真空干燥后惰性气氛下烧结处理，烧结温度为500?700℃，焙烧15?25h，自然降温后研磨，过325目筛，即获得金属元素掺杂Li3VxM2?x(PO4)3/C材料。本发明有助于锂离子的脱嵌和嵌入，增加了锂离子的扩散速率，提高了锂离子电池的电化学性能；本发明采用球磨辅助的水热合成的方式，与高温固相法相比，形成的粒子的粒径均匀，团聚现象降低；本发明采用纤维素碳源材料，绿色环保，具有精细的三维网状结构，增加了锂离子运输通道。
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