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Localized high-concentration electrolytes get more localized through micelle-like structures
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DOI：10.1038/s41563-023-01700-3.png)
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Abstract
En 中文
Liquid electrolytes in batteries are typically treated as macroscopically homogeneous ionic transport media despite having a complex chemical composition and atomistic solvation structures, leaving a knowledge gap of the microstructural characteristics. Here, we reveal a unique micelle-like structure in a localized high-concentration electrolyte, in which the solvent acts as a surfactant between an insoluble salt in a diluent. The miscibility of the solvent with the diluent and simultaneous solubility of the salt results in a micelle-like structure with a smeared interface and an increased salt concentration at the centre of the salt-solvent clusters that extends the salt solubility. These intermingling miscibility effects have temperature dependencies, wherein a typical localized high-concentration electrolyte peaks in localized cluster salt concentration near room temperature and is used to form a stable solid-electrolyte interphase on a Li metal anode. These findings serve as a guide to predicting a stable ternary phase diagram and connecting the electrolyte microstructure with electrolyte formulation and formation protocols of solid-electrolyte interphases for enhanced battery cyclability. Liquid electrolytes in batteries are considered to be macroscopically homogeneous ionic transport media despite having a complex chemical composition and atomistic solvation structures. A micelle-like structure in a localized high-concentration electrolyte for which the solvent acts as a surfactant is reported.
Keywords:
ORTHOFORMATE-BASED ELECTROLYTES
MOLECULAR-DYNAMICS
METAL BATTERIES
LITHIUM
CONDUCTIVITY
INTERPHASE
SOLVATION
CARBONATE
SODIUM
Journal
IF:
38.5
Papers:
6.8K
Citations:
11.5W
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