文献类型：期刊文献

英文题名：Alleviating anti-site defects and Jahn-Teller effects in Na4Fe1.5Mn1.5(PO4)2(P2O7) for high-power and long-life Na-ion batteries

作者：Wen, Shuting[1];Zhou, Linlin[1];Chen, Ling[1,2];Fang, Yaoguo[3];Cheng, Qian[3];Yu, Haifeng[1,2];Jiang, Hao[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：320

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20253919250182);WOS:【SCI-EXPANDED(收录号:WOS:001588434400001)】；

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：Na-ion batteries; Jahn-Teller effects; Element doping; Rate performance

摘要：High-safety and low-cost Na4Fe1.5Mn1.5(PO4)2(P2O7) (NFMPP) is a highly promising cathode for Na-ion batteries (SIBs), offering a higher energy density than typical NFPP. However, its performance is hindered by Na/Mn anti-site defects and Jahn-Teller (J-T) distortion, resulting in voltage hysteresis and sluggish Na-ion diffusion kinetics. Herein, we demonstrate a high-rate and long-life NFMPP cathode by synergistically optimizing the initial molar ratio of Na-ion to transition metal (Na/TM) and vanadium (V) doping. The Na/Mn anti-site defects have been greatly alleviated from 5.9 % to 2.2 %, effectively suppressing the voltage hysteresis of Mn2+/Mn3+ redox plateau. Meantime, the electron-rich V doping with strong V-O bonds (541 kJ/mol) exhibits strong interaction with Mn, significantly reducing the effect of J-T distortion on Na-ion diffusion. As a consequence, the optimized NFMPP cathode delivers a superior initial charge capacity of 115.1 mAh/g at 0.1C and achieves a high reversible energy density of 334 Wh/kg, surpassing many reported phosphate-based cathodes. It also exhibits exceptional cycling stability, retaining 94.1 % of its capacity after 500 cycles, making it a highly competitive candidate for next-generation SIBs.