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Yttrium-doped LiMnPO4/C cathodes: lattice-interface regulation and kinetic enhancement
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DOI：10.1016/j.jelechem.2026.120063.png)
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Abstract
En 中文
LiMnPO4 is a promising high-voltage cathode material for lithium-ion batteries, yet its practical application is restricted by poor electronic conductivity and slow lithium-ion diffusion. Herein, yttrium-doped LiMnPO4/C composites are synthesized via a solvothermal route to elucidate the role of rare-earth-induced lattice and interfacial regulation on electrochemical kinetics. Unlike conventional aliovalent dopants, Y3+ substitution introduces moderate lattice contraction and vacancy-assisted transport without blocking Li+ diffusion channels, thereby mitigating Jahn-Teller distortion of Mn3+ during cycling. Benefiting from the synergistic effects of intrinsic lattice stabilization, refined particle morphology, and optimized interfacial charge transfer, the optimized LiMn0.99Y0.01PO4/C cathode delivers a near-theoretical discharge capacity of 162.9 mAh center dot g- 1 at 0.1C and maintains 95.7% capacity retention after 100 cycles at 1C. This work provides mechanistic insight into rareearth-mediated lattice-interface coupling and offers a rational strategy for designing high-performance olivine-type cathode materials.
Keywords:
LiMnPO 4
Y doping
Rare earth
Lithium-ion battery
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