Highly uniform Co-Cu bimetallic sulfides for rechargeable alkaline aqueous zinc batteries  

作　　者：Xiaofang Bai Yuwei Zhao Mangwei Cui Tianshuo Guo Zijie Tang Chuan Li Heng Gao Shuo Yang Lingzhi Zhao Chunyi Zhi Hongfei Li 

机构地区：[1]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [2]Songshan Lake Materials Laboratory,Dongguan 523808,China [3]Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,China [4]International Centre for Quantum and Molecular Structures,Department of Physics,Shanghai University,Shanghai 200444,China [5]Guangdong Provincial Engineering Technology Research Center for Low Carbon and Advanced Energy Materials,Institute of Semiconductor Science and Technology,South China Normal University,Guangzhou 510631,China

出　　处：《Chinese Chemical Letters》2024年第2期521-526,共6页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.22005207);Guangdong Basic and Applied Basic Research Foundation(Nos.2019A1515011819,2020A1515110442)。

摘　　要：Rechargeable alkaline aqueous zinc batteries(RAZBs)have attracted increasing attention.However,most RAZBs are hindered by the limited availability of cathode materials.The practical electrochemical performance of most cathode materials is lower than the theoretical value due to their poor electrical conductivity and low utilization capacity.In this work,we develop a facile hydrothermal procedure to prepare highly uniform bimetallic sulfides as novel cathode materials for RAZBs.Copper-cobalt binary metallic oxides materials possess higher conductivity and larger capacity compared with their mono-metal oxides compounds due to bimetallic synergistic effects and multiple oxidation states.Furthermore,bimetallic sulfide compounds have smaller bond energy and longer bond length than their oxides,leading to less structural damage,faster kinetics of electrochemical reactions,and better stability.The as-prepared Co-Cu bimetallic sulfides show enhanced electrochemical performance due to various valences of Co and Cu as well as the existence of S.As a result,aqueous Zn/CuCo_(2)S_(4) battery shows a high specific capacity of 117.4 mAh/g at 4 A/g and a good cycle life of over 8000 cycles.Based on PANa hydrogel electrolytes,a flexible Zn/CuCo_(2)S_(4) battery demonstrates excellent cycling stability.This battery can also meet the requirements of electronic devices with different shapes and performs well in extreme environments,such as freezing,drilling,and hammering.This work opens new avenues to obtain high-rate and long-life cathode materials for RAZBs by utilizing the synergistic effects of bimetallic sulfides and provides a new platform for flexible energy storage devices.

关 键 词：Aqueous zinc batteries Bimetallic sulfides Cathode materials Rate performance Cycling stability 

分 类 号：TQ13[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]