Issue 27, 2025

Broadening the Mn2+/Mn3+ redox plateau in LiMn0.6Fe0.4PO4 cathodes for high-power and long-life Li-ion batteries

Abstract

LiMnxFe1−xPO4 (LMFP, 0 < x < 1) cathodes exhibit 20% higher energy density compared to LiFePO4 cathodes owing to the higher voltage plateau of the Mn2+/Mn3+ redox couple (4.1 V vs. Li/Li+). However, the sluggish reaction kinetics of this redox couple lead to a serious phase transition, shortening the voltage plateau and reducing the electrochemical performance. Here, we report a novel LMFP cathode with a broadened Mn2+/Mn3+ redox plateau via in situ Mg2+ and Ti4+ dual-doping. Mg2+, with its smaller ionic radius (0.65 Å), expands the Li+ transfer channel by elongating the Li–O bond, while the Ti4+ further accelerates Li+ diffusion rates by inducing (101) crystal-facet exposure. The accelerated Li+ diffusion effectively enhances reaction kinetics to mitigate the phase transition, resulting in a wider redox plateau with increased reversible capacity, especially at high power. The as-obtained LMFP-Mg/Ti delivers a capacity of 117 mA h g −1 at 5 C, which represents a significant increase compared to the pristine LMFP (79 mA h g −1). Additionally, this cathode retains 94.6% of its initial capacity over 1000 cycles at 3 C, highlighting its strong potential for high-power and long-life LIBs.

Graphical abstract: Broadening the Mn2+/Mn3+ redox plateau in LiMn0.6Fe0.4PO4 cathodes for high-power and long-life Li-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
14 Mar 2025
Accepted
03 Jun 2025
First published
04 Jun 2025

J. Mater. Chem. A, 2025,13, 22155-22162

Broadening the Mn2+/Mn3+ redox plateau in LiMn0.6Fe0.4PO4 cathodes for high-power and long-life Li-ion batteries

P. Wang, Y. Fang, E. Zhang, L. Chen, H. Yu, Q. Cheng and H. Jiang, J. Mater. Chem. A, 2025, 13, 22155 DOI: 10.1039/D5TA02101D

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