Membrane-less MoO_(3-x)@TiO_(2)-bromine battery with excellent rate capability and cyclic stability  

作　　者：Wenjie Huang Hui Wang Bin Yuan Liuzhang Ouyang Lichun Yang Min Zhu 

机构地区：[1]School of Materials Science and Engineering,Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials,South China University of Technology,Guangzhou 510640,Guangdong,China

出　　处：《Journal of Energy Chemistry》2024年第6期316-321,I0008,共7页能源化学（英文版）

基　　金：the financial support from the National Key Research and Development Program of China(2022YFB2502003);the Guangdong Basic and Applied Basic Research Foundation(2023B1515040011)。

摘　　要：Bromine has attracted significant attention as a cathode material for aqueous batteries due to its high reduction potential of 1.05 V(Br_(3)^(-)+2e~-■3Br~-),impressive theoretical specific capacity of 223 mA h g^(-1),and rapid reaction kinetics in the electrolyte.However,searching for compatible anode materials to match with bromine has posed a challenge due to its highly corrosive nature.In this study,we developed oxygen-deficient MoO_(3) with TiO_(2) coating(referred to as MoO_(3-x)@TiO_(2))as an anode material to pair with a bromine cathode in static full batteries.The oxygen deficiency contributes to enhanced electronic and protonic diffusion within the MoO_(3-x)lattice,while the TiO_(2) coating mitigates structural dissolution and proton trapping during cycling.The MoO_(3-x)@TiO_(2) demonstrates fast charge storage kinetics and excellent resistance to bromine corrosion.The impressive compatibility between MoO_(3-x)@TiO_(2) and bromine enables the construction of membrane-less full batteries with exceptional rate capability and cyclic stability.The MoO_(3-x)@TiO_(2)-bromine battery achieves an energy density of70.8 W h kg^(-1)at a power density of 328.1 W kg^(-1),showcasing an impressive long-term cyclic life of 20,000 cycles.Our study provides valuable insights for the development of high-performance aqueous secondary batteries.

关 键 词：Molybdenum trioxide Oxygen deficiency TiO_(2)coating Compatibility Bromine-based battery 

分 类 号：TB34[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]