An ultra-dilute Mg(TFSI)2 based electrolyte enabling reversible Mg metal anode

IF 9.4 1区 化学 Q1 CHEMISTRY, PHYSICAL
Caiyun Wang , Xingxing Wu , Yufan Xia , Xuan Zhang , Hongge Pan , Mi Yan , Yong Li , Yinzhu Jiang
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Abstract

Mg metal anodes experience significant passivation of harmful side reactions in conventional electrolyte consisting of magnesium bis(trifluoromethane sulfonyl)imide (Mg(TFSI)2) in 1,2-dimethoxyethane (DME), which critically impedes the advancement of high-performance rechargeable magnesium batteries. Herein, an innovative electrolyte system comprising an ultra-dilute 0.02 M Mg(TFSI)2 in DME with 4-chlorobutyl methyl ether (CME) as co-solvent is strategically devised. This unique formulation effectively suppresses the formation of TFSI-derived passivation byproducts while simultaneously facilitating the establishment of protective Cl-rich interphase, thereby achieving exceptional reversibility in Mg plating/stripping processes. Remarkably, Mg electrodes demonstrate stable cycling performance with a minimal overpotential of 70 mV at 0.1 mA cm−2 in the optimized 0.02 M Mg(TFSI)2-DME/CME electrolyte. More impressively, the system maintains reversible electrochemical operation for 400 h even at 2 mA cm−2. This work presents a novel electrolyte formulation for overcoming the limitations of Mg metal anode in conventional Mg(TFSI)2 based electrolytes, offering new perspectives for the development of next-generation rechargeable magnesium batteries.

Abstract Image

一种超稀Mg(TFSI)2基电解质,可实现可逆的Mg金属阳极
镁金属阳极在传统的1,2-二甲氧基乙烷(DME)中由二(三氟甲烷磺酰)亚胺(Mg(TFSI)2)组成的电解质中会发生严重的有害副反应钝化,这严重阻碍了高性能可充电镁电池的发展。本文战略性地设计了一种创新的电解质体系,该体系由超稀的0.02 M Mg(TFSI)2在二甲醚中以4-氯丁基甲基醚(CME)为共溶剂组成。这种独特的配方有效地抑制了TFSI -衍生钝化副产物的形成,同时促进了保护性富cl间相的建立,从而在Mg电镀/剥离过程中实现了卓越的可逆性。值得注意的是,Mg电极在优化的0.02 M Mg(TFSI)2- dme /CME电解质中表现出稳定的循环性能,在0.1 mA cm - 2下的过电位最小为70 mV。更令人印象深刻的是,该系统即使在2 mA cm - 2下也能保持400小时的可逆电化学操作。本文提出了一种新的电解质配方,克服了传统Mg(TFSI)2基电解质中Mg金属阳极的局限性,为下一代可充电镁电池的发展提供了新的前景。
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来源期刊
CiteScore
16.10
自引率
7.10%
发文量
2568
审稿时长
2 months
期刊介绍: The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality. Emphasis: The journal emphasizes fundamental scientific innovation within the following categories: A.Colloidal Materials and Nanomaterials B.Soft Colloidal and Self-Assembly Systems C.Adsorption, Catalysis, and Electrochemistry D.Interfacial Processes, Capillarity, and Wetting E.Biomaterials and Nanomedicine F.Energy Conversion and Storage, and Environmental Technologies
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