To study the effect of Fe and/or Zn doping on the performance of LiMnPO 4 , LiMn 0.9 Fe 0.1− x Zn x PO 4 /C ( x = 0, 0.05, and 0.1) composites were synthesized by a solid-state process. They are all single phase with olivine structure but LiMn 0.9 (FeZn) 0.05 PO 4 /C reveals a different morphology. The Fe-Zn co-doping remarkably enhances the performance of LiMnPO 4 due to the presence of Fe and Zn in olivine framework resulting in the decrease of charge transfer resistance and Mn ion dissolution. Compared with LiMn 0.9 Fe 0.1 PO 4 /C and LiMn 0.9 Zn 0.1 PO 4 /C, LiMn 0.9 (FeZn) 0.05 PO 4 /C exhibits much higher discharge capacity and better rate capability. It delivers the capacities of 151.3 mAh g −1 at 0.1 C and 128.4 mAh g −1 at 1 C and retains 96.7 % of the initial capacity after 100 cycles.