Constructing a high-performance cathode for aqueous zinc ion batteries via understanding the energy storage mechanism of MnO  

作　　者：Xue-Min Yan Hong Li Bing-Ling Zhang Bo-Hong Chen Wei Xiao 

机构地区：[1]College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou,434023,China [2]Institute of Energy Research,Jiangxi Academy of Sciences,Nanchang,330096,China

出　　处：《Rare Metals》2025年第1期218-229,共12页稀有金属(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.52374029).

摘　　要：MnO,a potential cathode for aqueous zinc ion batteries(AZIBs),has received extensive attention.Nevertheless,the hazy energy storage mechanism and sluggish Zn^(2+)kinetics pose a significant impediment to its future commercialization.In light of this,the electrochemical activation processes and reaction mechanism of pure MnO were investigated.Combining the Pourbaix diagram and phase diagram of Zn-Mn-O with experiment results,the essential energy storage behavior of MnO cathode can be explained as follows:(1)Zn^(2+)insertion/extraction into ZnMn_(2)O_(4)derived from MnO-based active material,and(2)Zn^(2+)insertion/extraction into ZnMn_(2)O_(4)(originated from the transition of Mn^(2+)→Zn2Mn3O8→ZnMn_(2)O_(4)in the electrolyte).To further ulteriorly enhance the electrochemistry performance of MnO,N-doped carbon fiber surrounding MnO nanoparticles was constructed,which can provide a conductive matrix with a high specific surface area preventing the undue stack of as-formed ZnMn_(2)O_(4).Additionally,it creates a conductive highway for Zn^(2+)penetration through the electrode/electrolyte interphase,thanks to the electron-rich N that facilitate the reduction of the desolvation penalty.Thus,the results from this study provide a new angle for designing high-performance MnO-based cathodes for AZIBs.

关 键 词：MnO-based cathode Phase diagram In-situ X-ray diffraction(XRD) Density functional theory(DFT) Energy storage behavior 

分 类 号：TM9[电气工程—电力电子与电力传动]