化学
电解质
共晶体系
三元运算
相间
水溶液
镁
无机化学
化学工程
化学稳定性
电极
物理化学
有机化学
合金
生物
计算机科学
工程类
遗传学
程序设计语言
作者
Xinmei Song,Yang Ge,Hao Xu,Song‐Song Bao,Lei Wang,Xiaolan Xue,Qianchuan Yu,Yizhi Xing,Zuoao Wu,Kefeng Xie,Tangsong Zhu,Pengbo Zhang,Yuzhu Liu,Zhangjian Wang,Zuoxiu Tie,Jing Ma,Lin Zhong
摘要
Aqueous rechargeable magnesium batteries hold immense potential for intrinsically safe, cost-effective, and sustainable energy storage. However, their viability is constrained by a narrow voltage range and suboptimal compatibility between the electrolyte and electrodes. Herein, we introduce an innovative ternary deep eutectic Mg-ion electrolyte composed of MgCl2·6H2O, acetamide, and urea in a precisely balanced 1:1:7 molar ratio. This formulation was optimized by leveraging competitive solvation effects between Mg2+ ions and two organic components. The full batteries based on this ternary eutectic electrolyte, Mn-doped sodium vanadate (Mn-NVO) anode, and copper hexacyanoferrate cathode exhibited an elevated voltage plateau and high rate capability and showcased stable cycling performance. Ex-situ characterizations unveiled the Mg2+ storage mechanism of Mn-NVO involving initial extraction of Na+ followed by subsequent Mg2+ intercalation/deintercalation. Detailed spectroscopic analyses illuminated the formation of a pivotal solid-electrolyte interphase on the anode surface. Moreover, the solid-electrolyte interphase demonstrated a dynamic adsorption/desorption behavior, referred to as the "breathing effect", which substantially mitigated undesired dissolution and side reactions of electrode materials. These findings underscore the crucial role of rational electrolyte design in fostering the development of a favorable solid-electrolyte interphase that can significantly enhance compatibility between electrode materials and electrolytes, thus propelling advancements in aqueous multivalent-ion batteries.
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