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Fire-Retardant Phosphate-Based Electrolytes for High-Performance Lithium Metal Batteries
- Source :
- ACS Applied Energy Materials. 2:2708-2716
- Publication Year :
- 2019
- Publisher :
- American Chemical Society (ACS), 2019.
-
Abstract
- Rechargeable lithium metal batteries (LMBs) are considered as promising candidates for high-energy storage systems, but their practical applications are plagued by the severe safety concerns and poor cyclability. Here we report a fire-retardant electrolyte consisting of 2.8 M lithium bis(trifluoromethanesulfonyl)imide in triethyl phosphate (TEP) with 10 vol % fluoroethylene carbonate (FEC) for high-performance LMBs. This concentrated system with almost no free solvent molecules and anions can alleviate the electrolyte reactivity toward Li anode and improve the anodic stability up to 5.0 V. FEC cosolvents as functional additives can enhance the ionic conductivity and reduce the viscosity of the concentrated electrolyte. Moreover, the presence of FEC in the TEP-based electrolyte favors to form a stable LiF-rich solid electrolyte interphase, suppressing the parasitic reactions between Li and TEP solvent and enabling a dendrite-free cycling of Li anode. A Li||LiFePO4 battery using this electrolyte shows a hig...
- Subjects :
- Battery (electricity)
Triethyl phosphate
Materials science
Energy Engineering and Power Technology
chemistry.chemical_element
Electrolyte
Anode
Solvent
chemistry.chemical_compound
chemistry
Chemical engineering
Materials Chemistry
Electrochemistry
Chemical Engineering (miscellaneous)
Ionic conductivity
Lithium
Electrical and Electronic Engineering
Fire retardant
Subjects
Details
- ISSN :
- 25740962
- Volume :
- 2
- Database :
- OpenAIRE
- Journal :
- ACS Applied Energy Materials
- Accession number :
- edsair.doi...........4ad8b6b9ad178f96db77772b347d2971