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

作     者：Quanqing Zhao Ruru Wang Ming Gao Bolin Liu Jianfeng Jia Haishun Wu Youqi Zhu Chuanbao Cao Quanqing Zhao;Ruru Wang;Ming Gao;Bolin Liu;Jianfeng Jia;Haishun Wu;Youqi Zhu;Chuanbao Cao

作者机构：Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of EducationSchool of Chemistry and Materials ScienceShanxi Normal UniversityTaiyuan 030032ShanxiChina Metals and Chemistry Research InstituteChina Academy of Railway Sciences Corporation LimitedBeijing 100081China Research Center of Materials ScienceBeijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green ApplicationsBeijing Institute of TechnologyBeijing 100081China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2024年第88卷第1期

页      面：421-427,I0010页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

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)。 

主　　题：Sodium ion battery Oxide cathode Phase engineering Phase diagram Na~+kinetic 

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.