Anionic solvation reconstruction stabilizes interfacial chemistry for high-temperature and high-voltage Li metal batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 42686773.
- Also identified by DOI 10.1038/s41467-026-76363-0.
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Abstract
The development of high-voltage Li metal batteries is crucial to meeting increasing demand for high specific energy. However, their high-temperature operation remains a huge challenge due to reduced electrolyte oxidation stability and aggravated interfacial side reactions. Herein, a multimodal <sup>19</sup>F nuclear magnetic resonance technique is developed to reveal temperature-mediated evolution of electrolyte anion solvation chemistry, thus identifying its vital roles in stabilizing high-voltage positive electrodes. A universal solvent screening strategy is proposed to customize an anion-anchored compact solvation structure electrolyte with large-size and anion-compressed solvation structure. This strategy simultaneously elevates anti-oxidation ability, stabilizes electrode-electrolyte interphase, and maintains structural integrity of the positive electrodes. Consequently, a 317 Wh kg<sup>-1</sup> Li metal pouch cell based on the total cell mass achieves high thermal safety and cycling stability at 55 °C. Our work elucidates the reaction mechanisms of solvation structure and interfacial chemistry in high-temperature and high-voltage Li metal batteries, which offers insightful guidance for designing wide-temperature battery electrolytes.