Synergistic Effects on Lithium Metal Batteries by Preferential Ionic Interactions in Concentrated Bisalt Electrolytes

Thuy Duong Pham, Abdullah Bin Faheem, So Yeon Chun, Jung Rae Rho, Kyungwon Kwak, Kyung Koo Lee

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Lithium metal batteries (LMBs) have the potential to deliver a greater specific capacity than any commercially used lithium battery. However, excessive dendrite growth and low Coulombic efficiencies (CEs) are major hurdles preventing the commercialization of LMBs. In this study, two different salts, lithium difluorophosphate (LiDFP) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), are chosen for use in concentrated electrolytic systems. By mixing salts with vastly different cation–anion interaction energies, the ion solvation structures in the electrolyte can be modulated to enhance the physical/electrochemical properties and suppress Li dendrite growth in LMBs. Among the investigated electrolyte systems, 2.2 m LiDFP + 1.23 m LiTFSI in 1,2-dimethoxyethane is proposed as a highly promising electrolyte system because of its high conductivity (6.57 mS cm−1), CE (98.3%), and the formation of an extremely stable solid–electrolyte interface layer. The bisalt electrolyte presented herein, as well as the associated concepts, provide a new avenue toward commercial LMBs.

Original languageEnglish
Article number2003520
JournalAdvanced Energy Materials
Volume11
Issue number11
DOIs
Publication statusPublished - 2021 Mar 18

Keywords

  • bisalt electrolytes
  • concentrated electrolytes
  • high ionic conductivity
  • lithium dendrites
  • lithium metal batteries
  • preferential ionic interactions

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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