Tuning the Li<sup>+</sup> Solvation Structure by a "Bulky Coordinating" Strategy Enables Nonflammable Electrolyte for Ultrahigh Voltage Lithium Metal Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 37127844.
- Also identified by DOI 10.1021/acsnano.3c02948.
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Abstract
In battery electrolyte design principles, tuning Li<sup>+</sup> solvation structure is an effective way to connect electrolyte chemistry with interfacial chemistry. Although recent proposed solvation tuning strategies are able to improve battery cyclability, a comprehensive strategy for electrolyte design remains imperative. Here, we report a solvation tuning strategy by utilizing molecular steric effect to create a "bulky coordinating" structure. Based on this strategy, the designed electrolyte generates an inorganic-rich solid electrolyte interphase (SEI) and cathode-electrolyte interphase (CEI), leading to excellent compatibility with both Li metal anodes and high-voltage cathodes. Under an ultrahigh voltage of 4.6 V, Li/NMC811 full-cells (<i>N</i>/<i>P</i> = 2.0) hold an 84.1% capacity retention over 150 cycles and industrial Li/NMC811 pouch cells realize an energy density of 495 Wh kg<sup>-1</sup>. This study provides innovative insights into Li<sup>+</sup> solvation tuning for electrolyte engineering and offers a promising path toward developing high-energy Li metal batteries.