Mn-Doped LiFePO4 Cathode Material: Solvothermal Preparation and Electrochemical Performance

LiFePO4 cathode materials with different doping amounts of Mn were synthesized by solvothermal using water and ethylene glycol as solvent. The crystal phase, morphology and electrochemical performance were studied. The results show that Mn has a positive effect in LiFePO4 cathode material, and the Mn-doping can improve the electrochemical performance of LiFePO4. On the one hand, a small amount of Mn-doping can broaden the lithium ion diffusion channel and reduce the charge transfer resistance. On the other hand, when the doped amount of Mn was too much, its own poor kinetic properties will cause the charge transfer to be blocked, resulting in battery polarization and serious capacity attenuation.