用于可充电水性锌离子电池的Ti_(3)C_(2)@ε-MnO_(2)电极  

Advanced Ti_(3)C_(2)@ε-MnO_(2) cathode as rechargeable aqueous zinc-ion batteries

作　　者：黄兰香 罗旭峰 HUANG Lanxiang;LUO Xufeng(Institute of Electronics and Materials Engineering,Leshan Normal University,Leshan 614000,China;West Silicon Materials Photovoltaic and New Energy Industry Technology Research Institute,Leshan 614000,China)

机构地区：[1]乐山师范学院电子与材料工程学院,乐山614000 [2]西部硅材料光伏新能源产业技术研究院,乐山614000

出　　处：《复合材料学报》2022年第10期4631-4641,共11页Acta Materiae Compositae Sinica

基　　金：乐山师范学院高层次人才引进科研启动项目(205190161);乐山市科技局重点项目(20GZD031)。

摘　　要：可充电水性锌-氧化锰(Zn-MnO_(2))电池具有成本低、安全性高、易于安装等特点,成为太阳能及风能储能装置的最佳选择。由于MnO_(2)导电性欠佳,导致电池循环性能较差,为解决此问题,本文采用导电性优异、具有丰富化学终端(T,如=O、-F、-OH)的二维层状过渡金属碳化物(MXene) Ti_(3)C_(2)Tx材料作为MnO_(2)颗粒的良好载体。基于化学终端的电负性,Mn能够与其产生强静电吸引,从而嵌入Ti_(3)C_(2)Tx MXene材料层间并吸附在其表面,使生成的MnO_(2)颗粒牢牢地锚定在Ti_(3)C_(2)Tx MXene上,形成了Ti_(3)C_(2)@MnO_(2)复合材料。当作为水性锌离子电池的正极材料时,Ti_(3)C_(2)@MnO_(2)在第1次充电过程中,完全转化为Ti_(3)C_(2)@ε-MnO_(2)。由于Ti_(3)C_(2)Tx MXene材料优异的导电性及层状结构,使Ti_(3)C_(2)@ε-MnO_(2)电极展现出了优异的动力学和电化学性能,在0.2 C (1 C=308 mA·h·g^(-1))倍率下放电时,比容量高达440 mA·h·g^(-1),能量密度为607 W·h·kg,在1 C倍率下循环150次后,容量从270 mA·h·g^(-1)增长至480 mA·h·g^(-1)。优异的电池性能,简单的材料制备方法再加上低成本、高安全性及易于组装的特性,使可充电水性Zn-MnO_(2)电池在大规模储能装置上的应用成为可能。Due to the low cost, high safety and easy assembly, rechargeable aqueous zinc-manganese oxide(ZnMnO_(2)) batteries are the best devices for energy storage. However, poor conductivity of MnO_(2)results in the bad cycle performance. Herein, highly conductive and layered Ti_(3)C_(2)Tx MXene with rich terminations(T, for example, =O,-F,-OH) were used as carriers for MnO_(2)particles. Due to the electronegativity of the terminations, Mnwas intercalated into the layers and adsorbed on the surface of Ti_(3)C_(2)Tx MXene, making the generated MnO_(2)particles can firmly anchored, forming the Ti_(3)C_(2)@MnO_(2)composites. As for the cathode of zinc-ion batteries, Ti_(3)C_(2)@MnO_(2)was fully converted to Ti_(3)C_(2)@ε-MnO_(2)during the 1st charge process. Thanks to the excellent conductivity and layered structure of Ti_(3)C_(2)Tx MXene, Ti_(3)C_(2)@ε-MnO_(2)cathode presents excellent kinetic properties and electrochemical performance with a high specific capacity of 440 mA·h·g^(-1)and high energy density(607 W·h·kg) at 0.2 C(1 C=308 mA·h·g^(-1)), and the capacities increase from 270 mA·h·g^(-1)to 480 mA·h·g^(-1)after 150 cycles at 1 C. Excellent electrochemical performance, simple material preparation methods, combined with the low cost, high safety and easy assembly characteristics, enable the possible application of rechargeable aqueous Zn-MnO_(2)batteries in largescale energy storage.

关 键 词：可充电水性锌离子电池 Mn_(3)O_(4) Ti_(3)C_(2)T_(x)MXene Ti_(3)C_(2)@ε-MnO_(2)电极 可充电电池 

分 类 号：TB34[一般工业技术—材料科学与工程]