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

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外文摘要：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 perfor-mance of most cathode materials is lower than the theoretical value due to their poor electrical conduc-tivity 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/CuCo2S4 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/CuCo2S4 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 mate-rials for RAZBs by utilizing the synergistic effects of bimetallic sulfides and provides a new platform for flexible energy storage devices.

外文关键词：

Aqueous zinc batteriesBimetallic sulfidesCathode materialsRate performanceCycling stability

作者：

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

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作者单位：

Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China

Songshan Lake Materials Laboratory,Dongguan 523808,China

Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,China

International Centre for Quantum and Molecular Structures,Department of Physics,Shanghai University,Shanghai 200444,China

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

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基金：

国家自然科学基金Guangdong Basic and Applied Basic Research FoundationGuangdong Basic and Applied Basic Research Foundation

项目编号：

220052072019A15150118192020A1515110442

出版年：

2024

DOI：

10.1016/j.cclet.2023.108406

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

年,卷(期)：2024.35(2)

参考文献量51