Leveraging cation effect for low temperature aqueous Zn-based batteries.

ABSTRACT: Anion‒water interactions in aqueous electrolytes can lower the freezing point for antifreezing applications, yet cation‒water interactions have usually been ignored. Here, we propose that the cation effect of Al³⁺ can simultaneously exert a deshielding effect on both H and O in water, which significantly weakens the water hydrogen bond and lowers the freezing point to -117 ^oC at a low salt concentration of 2.8 m. Additionally, dual-cation effects further optimize the ion diffusion kinetics and facilitate the formation of an Al‒Zn alloy layer for Zn electrode safeguarding. As demonstrated in batteries, the designed electrolyte enables the symmetrical Zn||Zn coin cell for 10,340 h of Zn plating/stripping and Zn||polyaniline pouch cell with a capacity retention of 100% a

SUBMITTER: Feng D 

PROVIDER: S-EPMC12537957 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature