Solid-state eutectic electrolyte via solvation regulation for voltage-elevated and deep-reversible Zn batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 40419480.
- Also identified by DOI 10.1038/s41467-025-60125-5 and PMC identifier 12106649.
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Abstract
Solid-state electrolytes have the great potential to achieve high-voltage and durable zinc-based batteries, but their effectiveness is limited by inferior ionic conductivity and large interfacial voltage polarization. Here, a nonflammable solid-state eutectic electrolyte is prepared in situ by cross-linking polymerization of ternary eutectic electrolyte with ethoxylated trimethylpropane triacrylate. Thanks to the intermolecular interaction among the deep eutectic solvents and polymer skeleton, the solid-state eutectic electrolyte possesses satisfactory room-temperature ionic conductivity of 3.94 × 10<sup>-3</sup> S cm<sup>-1</sup>. It enables the symmetric batteries with 80% Zn utilization operating stably at high current density of 8.0 mA cm<sup>-2</sup> for 1700 h, exceeding all non-aqueous and most aqueous zinc batteries. More importantly, due to solvation structure regulation, the solid-state eutectic electrolyte is found to elevate discharge voltage plateau to 2.1 V in Zn full batteries, and presents favorable rate performance and cyclic stability at 25 <math xmlns="http://www.w3.org/1998/Math/MathML"><mo>±</mo></math> 1 °C.