文献类型：期刊文献

英文题名：Enabling Ultrahigh-Power-Density LiMn0.6Fe0.4PO4 Cathodes via Kinetics Limitation Breakthrough and Jahn-Teller Distortion Mitigation

作者：Wang, Pengxu[1];Yu, Haifeng[2];Chen, Ling[1];Fang, Yaoguo[3];Cheng, Qian[3];Jiang, Hao[1,2];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[3]Shanghai Xuanyi New Energy Dev Co Ltd, Shanghai 201800, Peoples R China

年份：2026

卷号：20

期号：6

起止页码：5309

外文期刊名：ACS NANO

收录：;EI(收录号：20260820117437);WOS:【SCI-EXPANDED(收录号:WOS:001680429300001)】；

基金：This work was supported by the National Natural Science Foundation of China (U22A20429), the Program for Shanghai Pilot Program for Basic Research (22TQ1400100-13), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：LiMn0.6Fe0.4PO4; Jahn-Tellerdistortion; power density; cycle life; Li-ion batteries

摘要：Development of high-power LiMnxFe1-xPO4 (LMFP) cathodes is fundamentally challenged by the interplay between sluggish one-dimensional Li+ diffusion and severe Jahn-Teller distortion. Herein, we propose a synergistic substitution strategy to concurrently tackle these issues. Partial replacement of PO4 tetrahedra by planar BO3 groups creates three-dimensional interconnected Li-ion diffusion networks, while doping Nb5+ into transition-metal sites widens the diffusion channels. This tailored microstructure not only overcomes the intrinsic Li+ diffusion kinetics limitation but also dissipates the mechanical stress arising from high-rate operating conditions, suppressing the Jahn-Teller distortion in MnO6 octahedra by 36%. The optimized LMFP cathode delivers an ultrahigh reversible capacity of 126 mAh g(-1) at 10C (about a 3.6-fold improvement over the pristine LMFP) and retains 80.2% of its initial capacity after 2000 cycles at 3C in pouch-type full cells. This work elucidates the critical link between Li+ diffusion kinetics and structural stability, providing an available paradigm for designing high-power, long-life Mn-based cathode materials.