文献类型：期刊文献

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

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

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

年份：2025

卷号：13

期号：27

起止页码：22155

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20252518640096);WOS:【SCI-EXPANDED(收录号:WOS:001509083300001)】；

基金：This work was supported by the National Natural Science Foundation of China (22308103), 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：Association reactions - Doping (additives) - Iron compounds - Lithium compounds - Lithium-ion batteries - Manganese compounds - Phosphorus compounds - Reaction kinetics - Redox reactions

摘要：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 & Aring;), 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.