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Modulation of Mg 2+ desolvation enhances stability and reduces overpotential in magnesium battery electrolytes, suggesting a novel additive approach.
High overpotential and instability of Mg anode reactions limit the development of halide‐free Mg battery electrolytes. Here, we report 7‐aminoindole (7AID), a predominantly noncoordinating additive that modulates solvation via CH–π and hydrogen‐bonding interactions with both Mg 2+ ‐bound and free ether solvents. These outer‐shell and bulk‐phase interactions weaken Mg 2+ ···solvent binding, enhance solvent mobility, and lower the desolvation barrier. As a result, Mg plating/stripping overpotentials are significantly reduced and interfacial stability is improved. Compared to strongly coordinating additives, this approach suppresses parasitic reactions and enables more stable cycling. This work presents a solvation‐targeted additive design paradigm beyond the primary coordination shell for advancing multivalent battery electrolytes.
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Deng et al. (2025) studied this question.
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