Non-layer-transformed Mn_(3)O_(4) cathode unlocks optimal aqueous magnesium-ion storage via synergizing amorphous ion channels and grain refinement

作     者：Zhongyu Pan Tingting Qin Wei Zhang Xianyu Chu Taowen Dong Nailin Yue Zizhun Wang Weitao Zheng Zhongyu Pan;Tingting Qin;Wei Zhang;Xianyu Chu;Taowen Dong;Nailin Yue;Zizhun Wang;Weitao Zheng

作者机构：State Key Laboratory of Automotive Simulation and ControlSchool of Materials Science&EngineeringKey Laboratory of Mobile Materials MOEElectron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012JilinChina 

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

年 卷 期：2022年第31卷第5期

页      面：42-48页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China (51932003, 51872115) the 2020 International Cooperation Project of the Department of Science and Technology of Jilin Province (20200801001GH) the Program for the Development of Science and Technology of Jilin Province(20190201309JC) the Jilin Province/Jilin University coConstruction Project-Funds for New Materials (SXGJSF2017-3,Branch-2/440050316A36) the Project for Self-innovation Capability Construction of Jilin Province Development and Reform Commission (2021C026) the Program for JLU Science and Technology Innovative Research Team (JLUSTIRT, 2017TD-09) the Fundamental Research Funds for the Central Universities JLU, and “DoubleFirst Class” Discipline for Materials Science&Engineering 

主　　题：Spinel Mn3O4 Grain refinement Amorphous ARMBs 

摘      要：Aqueous rechargeable magnesium ion batteries(ARMBs) have obtained more attention due to the twoelectrons transfer nature, low cost and safety. However, the scarcity of cathode materials seriously hinders the development of ARMBs because of the unfavorable strong interaction between Mg^(2+) and cathode material. Herein, we choose a pre-treated spinel Mn_(3)O_(4) cathode for aqueous Mg^(2+) storage. The pretreatment in Na_(2)SO_(4) solution induces the grain refinement decorated with tortuous amorphous ion diffusion channels, facilitating the production of electrochemical reaction active sites and the diffusion of Mg^(2+), respectively, which achieve a(sub-)surface pseudocapacitance reaction between Mn(Ⅱ) and Mn(Ⅲ). As a result, the pre-treated Mn_(3)O_(4) cathode exhibits a package of optimal performances, i.e., a capacity of 98.9 m Ah g^(-1) and a high capacity retention rate of 99.4% after 2000 cycles. To the best of our knowledge, our work not only provides a new reaction mechanism of spinelMn_(3)O_(4) in aqueous batteries system,but also affords a high cycle stability electrode material for rechargeable Mg^(2+) energy storage.