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Critical Role and Recent Development of Separator in Zinc-Air Batteries

分离器(采油) 环境科学 工程类 材料科学 冶金 物理 热力学
作者
Meng-Yin Wang,Ruo-Bei Huang,Jianfeng Xiong,Jing‐Hua Tian,Jianfeng Li,Zhong‐Qun Tian
出处
期刊:Acta Physico-chimica Sinica [Acta Physico-Chimica Sinica & University Chemistry Editorial Office, Peking University]
卷期号:: 2307017-2307017 被引量:2
标识
DOI:10.3866/pku.whxb202307017
摘要

Amidst widespread consumption and the scarcity of non-renewable fossil fuels, the advancement of clean energy sources like solar and wind energy holds immense significance.Nevertheless, these clean energy sources grapple with unstable power supply, underscoring the pressing need for the enhancement of largescale energy conversion and storage devices.Zinc-air batteries, boasting high energy density, safety, affordability, ease of assembly, eco-friendliness, and abundant zinc metal resources, exhibit promising potential as energy storage and conversion solutions.Nevertheless, various challenges persist in their application, including a limited cycle life and inadequate power density.Throughout the charge and discharge cycles, factors such as the dendritic growth of the zinc negative electrode, the formation of ZnO passivation layers, electrolyte evaporation, and side reactions involving the diffusion of zincate ions to the positive electrode collectively exert influence on the performance of zinc-air batteries.The separator plays a crucial role in zinc-air batteries by isolating the positive and negative electrodes to prevent short circuits, and these aforementioned issues can be resolved through optimization of the design.Until now, the commonly employed separators in zinc-air batteries can be categorized into various types: standard porous separators, anion exchange membranes, polymer gel electrolyte membranes, and composite membranes comprising diverse polymer compositions.Among these, within the context of separator research, porous separators of the polyolefin type are generally utilized in aqueous alkaline zinc-air batteries.Nevertheless, their pronounced hydrophobic nature results in markedly diminished ion conductivity.Conversely, gel-based solid-state or semisolid-state electrolyte membranes are tailored for flexible electronic device applications.This adaptation ensures that zincair batteries uphold favorable electrochemical performance even under deformation conditions, simultaneously addressing the challenge of electrolyte volatilization to a certain degree.Fundamental attributes of the separator, such as pore size, hydrophilicity, and other properties, significantly impact the battery's lifespan and charge/discharge performance.Nevertheless, research on separators and their modifications to enhance zinc-air battery performance, along with the underlying principles, lags behind other aspects of zinc-air battery research, presenting ample room for advancement.This review offers a concise overview of zinc-air battery development, using aqueous alkaline zinc-air batteries as an example to elucidate their operational principles.The objective is to grasp the challenges leading to battery failure in different components and to particularly analyze how separator performance influences overall battery efficiency.This includes aspects such as ion selectivity, ion conductivity, stability, and water retention of the separator.The overview is divided into two main sections: (1) elucidating the fundamental structure and operational principles of the zinc-air battery, and (2) comprehensively exploring the fundamental attributes of the separator and its pivotal function within the zinc-air battery.The research progress and perspective for the development of zinc-air battery separators are also discussed and anticipated.
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