Engineering Robust Battery Interphases with Dilute Fluorinated Cations

18 January 2024, Version 1


Controlling solid electrolyte interphase (SEI) in batteries is crucial for their efficient cycling. Herein, we demonstrate an approach to enable robust battery performance that does not rely on high fractions of fluorinated species in electrolytes, thus substantially decreasing the environmental footprint and cost of high-energy batteries. In this approach, we use very low fractions of readily reducible fluorinated cations in electrolyte (~0.1 wt.%) and employ electrostatic attraction to generate a substantial population of these cations at the anode surface. As a result, we can form a robust fluorine-rich SEI that allows for dendrite-free deposition of dense Li and stable cycling of Li metal full cells with high-voltage cathodes. Our approach represents a general strategy for delivering desired chemical species to battery anodes through electrostatic attraction while using minute amounts of additive.


Lithium metal batteries
Electrolyte additives
Solid electrolyte interphase
Cathode electrolyte interphase

Supplementary materials

Supplementary data - Engineering Robust Battery Interphases with Dilute Fluorinated Cations
Supplementary Figures 1-26; Supplementary discussion Supplementary tables 1-2;


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