Abstract
Fast charging of high-energy batteries is critical for transportation electrification but remains challenging because the rapid rise in cell overpotential easily exceeds electrolytes’ fixed electrochemical stability window. Here we design a self-adaptive electrolyte with a dynamically expanding electrochemical stability window that increases in real time during charging, outpacing the rise in overpotential as the charging current intensifies. The self-adaptive electrolyte is a single-phase solution of salt and complementary oxidation- and reduction-resistant solvents at the cloud point composition but can undergo solvent separation to dynamically redistribute solvent components during charging. The oxidation-resistant solvents concentrate at the positive electrode and reduction-resistant solvents accumulate at the negative electrode, broadening the electrolyte stability window in real time during charging. Proof-of-concept experiments validate the versatility of this design in both aqueous zinc-metal and non-aqueous lithium-metal batteries, achieving high Coulombic efficiencies of negative electrodes and enhanced oxidative stability for positive electrodes.
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Acknowledgements
This work was supported by the US Department of Energy, Basic Energy Science (award number DE-SC0023408).
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C.-X.Z. and C.W. conceived the idea for the project. C.-X.Z. and Z.L. performed electrochemical experiments. C.-X.Z. conducted the calculation. B.C. and F.C. carried out the NMR analysis. C.-X.Z. and C.W. drafted the paper. C.W. directed the project.
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Nature Energy thanks Elie Paillard and the other, anonymous, reviewers for their contribution to the peer review of this work.
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Supplementary Figs. 1–29.
Source data
Source Data Fig. 2
Raw data of ternary phase diagrams.
Source Data Fig. 3
Raw data of ternary phase diagrams, ACN content and IR results.
Source Data Fig. 4
Raw data of HER kinetics.
Source Data Fig. 6
Raw data of ternary phase diagrams.
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Zhao, CX., Li, Z., Chen, B. et al. Self-adaptive electrolytes for fast-charging batteries. Nat Energy 10, 904–913 (2025). https://doi.org/10.1038/s41560-025-01801-0
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DOI: https://doi.org/10.1038/s41560-025-01801-0