Enhancing H^(+)intercalation kinetics and stability in Cu^(2+)pre-intercalatedδ-MnO_(2)for aqueous aluminum batteries  

作　　者：Hanqing Gu Mingjun Chen Zhibao Wang Wenming Zhang Zhanyu Li 

机构地区：[1]Hebei Key Laboratory of Optic-Electronic Information and Materials,National&Local Joint Engineering Laboratory of New Energy Photoelectric Devices,College of Physics Science and Technology,Hebei University,Baoding 071002,Hebei,China

出　　处：《Journal of Energy Chemistry》2025年第3期126-133,共8页能源化学(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(52102233);Science and Technology Project of Hebei Education Department(QN2023019)。

摘　　要：Aqueous aluminum ion batteries(AAIBs)have garnered extensive attention due to their environmental friendliness,high theoretical capacity,and low cost.However,the sluggish reaction kinetics and severe structural collapse of the cathode material,especially manganese oxide,during the cycling process have hindered its further application.Herein,Cu^(2+)pre-interca la ted layeredδ-MnO_(2)was synthesized via a hydrothermal method.The pre-intercalated Cu^(2+)ions not only improve the conductivity of MnO_(2)cathode but also stabilize the structure to enhance stability.X-ray absorption fine structure(XAFS)combined with density functional theory(DFT)calculations confirm the formation of the covalent bond between Cu and O,increasing the electronegativity of O atoms and enhancing the H^(+)adsorption energy.Moreover,ex-situ measurements not only elucidate the Al^(3+)/H^(+)co-insertion energy storage mechanism but also demonstrate the high reversibility of the Cu-MnO_(2)cathode during cycling.This work provides a promising modification approach for the application of manganese oxides in AAIBs.

关 键 词：Aqueous aluminum-ion batteries Energy storage mechanism MnO_(2)cathodes Cu^(2+) pre-intercalated 

分 类 号：TM912[电气工程—电力电子与电力传动]