生物启发膜在水系镁离子电池阴极的界面工程

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中文摘要：受到水合镁离子的高脱溶能垒和不良界面水分解行为的限制,水系镁离子电池通常受制于缓慢的离子传输动力学和严重的阴极溶解.为了克服这些障碍,受细胞膜两亲性结构的启发,我们成功构建了一种由疏水性聚(3,4-乙二氧基噻吩)(PEDOT)和亲水性α-MnO2基底组成的MnO2碳基阴极.结合实验和理论计算结果分析,PEDOT层可以有效提高整体电极的导电性,降低水合Mg2+的脱溶能垒,并抑制阴极溶解,从而提高复合电极的性能.因此,本文所制备的复合电极表现出优越的速率性能(58.4 mAh g-1,3 A g-1)和增强的长期循环稳定性(1000个循环后85.92 mAh g-1,2 A g-1),优于原始的α-MnO2阴极.这项基于生物启发设计理念的工作将为水合镁离子电池的发展提供创新方向.

外文标题：A bio-inspired membrane of interfacial engineering in the cathode in aqueous magnesium-ion batteries

外文摘要：Limited by the high de-solvation energy barrier of hydrated Mg2+and undesired interfacial water decomposi-tion behavior,aqueous magnesium ion batteries normally suffer from sluggish ion transfer kinetics and drastic cathode dissolution.To overcome these obstacles,inspired by the amphiphilic structure of cell membranes,a MnO2/carbon-based cathode composed of hydrophobic poly(3,4-ethylene-dioxythiophene)(PEDOT)and hydrophilic α-MnO2 substrate was successfully constructed.In combination with experi-mental and theoretical calculations,the PEDOT layer can ef-ficaciously enhance the conductivity for the overall electrode,reduce the de-solvation energy barrier of hydrated Mg2+,and inhibit the cathode dissolution,thereby boosting the perfor-mance of composite electrodes.Therefore,the as-prepared composite electrode demonstrates superior rate performance(58.4 mAh g-1,3 A g-1)and enhanced long-term cycle stability(85.92 mAh g-1 after 1000 cycles,2 A g-1)which is superior to the pristine α-MnO2 cathode.Based on the bio-inspired design concept,this work will provide an innovative direction for the development of aqueous magnesium-ion batteries.

外文关键词：

aqueous magnesium-ion batteryde-solvation pro-cesscathode dissolutionbio-inspired design concepthydro-phobic interfacial layer

作者：

洛古子呷、苟倩志、罗号燃、陈昭宇、邓江斌、王凯鑫、何玉婷、李英芳、王磊、张奔、郑玉杰、李猛

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作者单位：

National Innovation Center for Industry-Education Integration of Energy Storage Technology,Xuefeng Mountain Energy Equipment Safety National Observation and Research Station,MOE Key Laboratory of Low-Grade Energy Utilization Technologies and Systems,CQU-NUS Renewable Energy Materials & Devices Joint Laboratory,College of Energy & Power Engineering,Chongqing University,Chongqing 400044,China

Chongqing Windmagics Weichu Energy Co.,Ltd.,Chongqing 401121,China

Southwest Technology and Engineering Research Institute,Chongqing 400039,China

关键词：

aqueous magnesium-ion battery de-solvation pro-cess cathode dissolution bio-inspired design concept hydro-phobic interfacial layer

基金：

National Natural Science Foundation of ChinaVenture & Innovation Support Program for Chongqing Overseas ReturneesScience and Technology Innovation and Improving Project of Army Medical University

项目编号：

52173235CX20210182021XJS24

出版年：

2024

DOI：

10.1007/s40843-024-2962-y

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(8)