Back
manuscript_15072025
Journal article

Non-fluorinated Asymmetric Ether Electrolytes with Controlled Solvation Structure for High-Voltage Lithium Metal Batteries

DOKPE

Show more…
  • 2025
Published in:
  • ACS Energy Letters. - American Chemical Society (ACS). - 2025, vol. 10, no. 8, p. 3900-3906
Li metal batteries
High voltage cathodes
solvation structure
electrolyte engineering
English Ether-based electrolytes are well-suited for lithium metal anodes but suffer from limited oxidative stability, restricting their use with high-voltage cathodes. Fluorination has been employed to mitigate this challenge; however, their recycling poses environmental challenges. Increasing salt concentration can enable the use of non-fluorinated ethers but often results in larger ion clusters, compromising conductivity and rate capability. Here, we design amphiphilic ether solvents, 1-(2-methoxyethoxy)butane (M4C) and 1-(2-methoxyethoxy)hexane (M6C), to promote preferential contact ion pair (CIP) formation across different LiFSI concentrations, breaking the usual linear cluster size–concentration relationship. Notably, 2 M LiFSI in M4C supports stable cycling of a 20 μm lithium metal anode paired with an NMC811 cathode at 4.3 V for over 200 cycles under stringent conditions (N/P = 2.5). The electrolyte also delivers robust performance under fast charging (3C) and slow discharging (1C), demonstrating its potential for high-energy, high-rate lithium metal batteries without relying on fluorinated solvents.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
Other electronic version

Version publiée

License
Rights reserved
Open access status
green
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/333348
Statistics
Document views: 21 File downloads:
  • manuscript_15072025: 14