摘要
水系锌离子电池(AZIBs)因其低成本、无毒性及高理论容量等优势,被视为大规模和长期储能领域的理想之选。然而,锌负极不可控地枝晶生长、表面腐蚀和析氢反应等问题,严重限制了AZIBs的实际应用。本工作提出了一种通过聚阴离子共价有机骨架(COFs)纳米片涂覆PP隔膜制备复合隔膜设计,旨在稳定锌负极。所制备的COFs材料具有独特的纳米孔径和丰富的阴离子基团,能够有效筛选离子,抑制SO_(4)^(2-)的迁移,并均匀化Zn^(2+)通量,诱导Zn^(2+)在(002)晶面的择优取向,从而实现了Zn^(2+)的均匀沉积。因此,使用复合隔膜可实现高锌离子的迁移数(0.68)和较高的电导率(13.8 mS/cm)。基于该隔膜组装的对称电池在1 mA/cm^(2)、1 mAh/cm^(2)条件下,展现出超过600 h的循环稳定性,表现出高度可逆的电镀/剥离行为。此外,使用NaV_(3)O_(8)·1.5H2O作为正极材料的全电池,表现出高的初始容量(261.5 mAh/g)且可稳定循环超过900圈。该研究为水系电池的隔膜设计提供了新思路,为高容量、无枝晶和规模化应用的水系锌离子电池的实现奠定了基础。
Aqueous zinc-ion batteries(AZIBs)have emerged as promising candidates for large-scale and long-term energy storage because of their low cost,nontoxicity,and high theoretical capacity.However,issues such as uncontrolled Zinc(Zn)dendrite growth,surface corrosion,and hydrogen evolution at the Zn anode hinder their practical applications.In this study,a composite separator was developed by coating polypropylene(PP)separators with polyanionic covalent organic frameworks(COFs)nanosheets to stabilize the Zn anode.The prepared COF material,featuring unique nanopores and abundant anionic groups,exhibits ion-sieving properties that inhibit the migration of SO_(4)^(2-) ions while homogenizing the Zn^(2+)flux.This unique architecture induces a preferential orientation of Zn^(2+)deposition on the(002)plane.As a result,cells using the COF-PP separator achieved a high zinc-ion transference number(0.68)and high ionic conductivity(13.8 mS/cm).The Zn/Zn symmetric cell using COF-PP separators demonstrated cycling stability,exhibiting highly reversible plating/stripping behavior that exceeded 600 h at 1 mA/cm^(2)/1 mAh/cm^(2).Furthermore,when paired with a NaV_(3)O_(8)·1.5H2O cathode,the full cell achieved an impressive initial capacity of 261.5 mAh/g while retaining remarkable stability over 900 cycles.This study provides a novel approach for the development of separators for aqueous batteries,enabling the realization of high-capacity,dendrite-free,and scaleable aqueous zinc-ion batteries.
作者
冷杨
黄硕
桂凯旋
闫文其
刘琪
LENG Yang;HUANG Shuo;GUI Kaixuan;YAN Wenqi;LIU Qi(School of Materials Science and Engineering,Anhui Polytechnic University,Wuhu 241000,Anhui,China)
出处
《储能科学与技术》
北大核心
2025年第5期1900-1909,共10页
Energy Storage Science and Technology
基金
安徽省高校自然科学研究项目(2023AH050920)
安徽省青年基金(2408085QE153)。
关键词
水系锌离子电池
聚阴离子COFs
锌枝晶
电化学性能
aqueous zinc-ion batteries
polyanionic COFs
Zn dendrites
electrochemical performance
作者简介
第一作者:冷杨(1998-),男,硕士研究生,主要从事锌离子电池隔膜/电解液开发,E-mail:15551672971@163.com;通信作者:桂凯旋,副教授。主要从事固态电解质、陶瓷基复合材料的研究开发,E-mail:guikx@ahpu.edu.cn;闫文其,讲师,主要从事有机/水系电池复合隔膜设计、锌金属负极界面调控研究,E-mail:yanwq@ahpu.edu.cn。
