A low-concentration all-fluorinated electrolyte for stable lithium metal batteries

Abstract

A low-concentration (0.5 M) all-fluorinated electrolyte (LCAFE) is designed to stabilize high-energy-density lithium metal batteries. Introducing fluorinated solvents can control the electrolyte’s solvation structure, interfacial chemistry, and physicochemical properties. Therefore,...

Developing diluted low-concentration electrolyte with a high anion-to-solvent ratio for high-voltage lithium metal batteries

“…6f and Table S3†). 44–50 Furthermore, we evaluated hybrid–DLCE in a Li|NCM pouch cell to demonstrate its potential for practical applications. A Li|NCM pouch cell was fabricated with commercial-level mass loading NCM (4.1 mA h cm −2 ), a 30 μm-thick Li anode, and lean electrolyte (2.8 g A h −1 ).…”

Emerging electrolytes with fluorinated solvents for rechargeable lithium-based batteries

“…Alternatively, highly fluorinated diluents (polyfluorinated and perfluorinated solvents) show poor solvating power, exerting a minimal change in the solvation structure of electrolytes. 92 However, we emphasize that even this tiny change in solvation structure can significantly affect the properties of the electrolyte. For example, a diluent with a certain solvating power can deteriorate the recyclability of the lithium metal, whereas a weak-coordinated diluent is beneficial for the formation of a homogeneously distributed, ultra-high Li 2 O content in SEI, enabling a high CE of Li.…”

Recent progress in nonflammable electrolytes and cell design for safe Li-ion batteries

“…Although uorination is promising for stable LIBs, a high degree of electron-withdrawing substitution decreases the solvation capability of oxygen atoms, providing low salt solubility and ionic conductivity. 90,91 Therefore, the design of uorinated molecules should seek a balance between high stability and ionic conductivity. In addition, the wide application of highly uorinated electrolytes is challenged by their high solvent costs, toxicity, and sustainability concerns from decomposed halogen gases.…”