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Solvation Structures in Aqueous Metal-Ion Batteries

机译：Solvation Structures in Aqueous Metal-Ion Batteries

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摘要

Aqueous batteries have attracted great attention due to their inherent lowcost, intrinsic safety, and environmental friendliness. Because of intrinsicoxygen evolution reactions (OER) and hydrogen evolution reactions (HER) viawater splitting, aqueous batteries possess narrow electrochemical stabilitywindows (ESWs, theoretical ESW is 1.23 V), leading to low output voltage andlow delivered capacity, and thus low energy density. Meanwhile, the parasiticside reactions of electrode materials dissolution, gas evolution, and dendritegrowth can shorten cyclic stability of aqueous batteries. The above deepseatedchallenges are closely related to the solvation structure of metal ions,which can be settled by adjusting and regulating the solvation structure. Thisreview summarizes the research progress in solvation structures in metal-ionbatteries. First, the design principles of the solvation structure and its impacton battery performance are introduced. Second, the regulation of the solvationstructure and the research progress are introduced from three points ofview: high concentration salt strategies, MOF modification and electrolyteadditives. After that, the commonly used characterization methods for solvationstructure are summarized. Finally, the existing problems and challengesin the frontier research of solvation structure research are summarized.

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