Phase-engineering modulation of Mn-based oxide cathode for constructing super-stable sodium storage

查看全文 作　　者：Quanqing [1]Zhao;Ruru [1]Wang;Ming [2]Gao;Bolin [3]Liu;Jianfeng [1]Jia;Haishun [1]Wu;Youqi [3]Zhu;Chuanbao [3]Cao

机构地区：[1]Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education,School of Chemistry and Materials Science,Shanxi Normal University,Taiyuan 030032,Shanxi,China;[2]Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;[3]Research Center of Materials Science,Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Journal of Energy Chemistry》索引2024年第88卷第1期,共8页

基　　金：supported by the National Natural Science Foundation of China (52173273);Fundamental Research Funds for the Central Universities (2022CX11013);Shanxi Province Science Foundation for Youths (No.202203021212391);the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (No.2022L253);Institute Foundation Project of China Academy of Railway Sciences Corporation Limited Metals and Chemistry Research Institute (No.2023SJ02)。 摘　　要：The Mn-based oxide cathode with enriched crystal phase structure and component diversity can provide the excellent chemistry structure for Na-ion batteries.Nevertheless,the broad application prospect is obstructed by the sluggish Na^(+)kinetics and the phase transitions upon cycling.Herein,we establish the thermodynamically stable phase diagram of various Mn-based oxide composites precisely controlled by sodium content tailoring strategy coupling with co-doping and solid-state reaction.The chemical environment of the P2/P'3 and P2/P3 biphasic composites indicate that the charge compensation mechanism stems from the cooperative contribution of anions and cations.Benefiting from the no phase transition to scavenge the structure strain,P2/P'3 electrode can deliver long cycling stability(capacity retention of 73.8%after 1000 cycles at 10 C)and outstanding rate properties(the discharge capacity of 84.08 mA h g^(-1)at 20 C)than P2/P3 electrode.Furthermore,the DFT calculation demonstrates that the introducing novel P'3 phase can significantly regulate the Na^(+)reaction dynamics and modify the local electron configuration of Mn.The effective phase engineering can provide a reference for designing other high-performance electrode materials for Na-ion batteries. 关键词：Sodium ion battery Oxide cathode Phase engineering Phase diagram Na~+kinetic

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Phase-engineering modulation of Mn-based oxide cathode for constructing super-stable sodium storage

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