Enhancing Rate Capability of LiMn _0.6 Fe _0.4 PO ₄ Cathodes via V ³⁺ Doping and Catalytic Graphitization Carbon Coating

Olivine‐structured (LiMn _0.6 Fe _0.4 PO ₄ , LMFP) is a promising cathode material for high‐energy‐density lithium‐ion batteries due to its high operating voltage and excellent safety. However, its poor electronic conductivity and sluggish Li ⁺ diffusion kinetics severely limit high‐rate performance. In this work, a V ³⁺ doping strategy is adopted to achieve the synergistic effect of bulk lattice regulation of LMFP and catalytic graphitization of carbon coating. V ³⁺ ‐doped LMFP precursors were solvothermally synthesized with ethylene glycol, combined with glucose, spray‐dried for self‐assembly, and annealed to form carbon‐coated V‐doped LMFP composites. Results show V ³⁺ doping induces lattice contraction to broaden Li ⁺ diffusion channels, inhibits particle agglomeration (primary particles size: 100–200 nm), and catalyzes carbon layer graphitization to enhance electronic conductivity. The optimal LMFP‐V2 exhibits outstanding performance: 85.2 mAh·g ⁻¹ at 10 C (vs. 34.9 mAh·g ⁻¹ for undoped LMFP‐V0) and 91.3% capacity retention after 500 cycles at 1 C (vs. 84.7% for LMFP‐V0), providing an efficient strategy for synchronously optimizing Li ⁺ diffusion and electronic transport of LMFP.