Issue 16, 2024

Anti-corrosive electrolyte design for extending the calendar life of lithium metal batteries

Abstract

Localized high-concentration electrolytes (LHCEs) have been proposed for lithium metal batteries (LMBs) to control the solvation structure of the lithium ions and consequently the solid–electrolyte-interphase (SEI) composition. Although this approach extends the cycle life effectively, the fluorinated diluents in LHCEs severely corrode metallic Li via spontaneous chemical decomposition, which shortens the calendar life. Here, we introduce an LHCE containing hexafluoroisopropyl methyl ether (HFME) as the diluent to which n-hexane has been added. n-Hexane serves as a kinetic barrier in the “swollen” SEI to suppress the Li corrosion by HFME. A galvanostatically cycled full-cell that includes n-hexane, with an 8-hour rest period inserted at the end of each charge, has a markedly improved calendar life compared to its hexane-free counterpart (80.8% retention after 160 cycles vs. 6.0% retention after 46 cycles). This study reveals the usefulness of introducing an inert hydrocarbon to enhance both the cycle life and calendar life of LHCE-based LMBs.

Graphical abstract: Anti-corrosive electrolyte design for extending the calendar life of lithium metal batteries

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2024
Accepted
11 Jul 2024
First published
11 Jul 2024

Energy Environ. Sci., 2024,17, 6079-6090

Anti-corrosive electrolyte design for extending the calendar life of lithium metal batteries

M. Kim, J. An, S. Shin, I. Hwang, J. Lee, Y. Park, J. Kim, E. Park, J. Kim, G. Park, S. Kim, A. Coskun and J. W. Choi, Energy Environ. Sci., 2024, 17, 6079 DOI: 10.1039/D4EE01436G

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