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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Fluorine-Substituted Halide Solid Electrolytes with Enhanced Stability toward the Lithium Metal.
Priya Ganesan1,2, Mervyn Soans1,2, Musa Ali Cambaz1,2
1Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081 Ulm, Germany.
ACS Applied Materials & Interfaces
|August 1, 2023
Summary
Fluorinating halide solid electrolytes enhances stability against lithium metal anodes. This improved interfacial stability reduces polarization, paving the way for safer solid-state batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Halide-based solid electrolytes offer high ionic conductivity and oxidation stability.
- Their practical application is limited by poor reduction stability and instability against lithium metal anodes.
Purpose of the Study:
- To enhance the stability of halide solid electrolytes toward lithium metal anodes through gradual fluorination.
- To investigate the structural and electrochemical properties of fluorine-substituted Li2ZrCl6-Fx compounds.
Main Methods:
- Mechanochemical synthesis of fluorine-substituted compounds (Li2ZrCl6-Fx, 0 ≤ x ≤ 1.2).
- Theoretical calculations (density functional theory) to study Li-ion migration barriers and interfacial properties.
- Electrochemical testing (lithium stripping and plating) and ex situ X-ray photoelectron spectroscopy (XPS) to analyze interfacial stability.
Main Results:
- Fluorine substitution induced a distorted local structure and altered Li-ion migration barriers.
- Li2ZrCl5.5F0.5 showed an increased Li+ migration energy barrier compared to Li2ZrCl6.
- Fluorine-substituted compounds exhibited significantly lower polarization after 800 h of cycling due to enhanced interfacial stability.
Conclusions:
- Gradual fluorination of Li2ZrCl6 effectively improves its interfacial stability against lithium metal anodes.
- The formation of a fluorine-rich passivating interphase is responsible for the enhanced stability.
- This strategy holds promise for developing advanced solid electrolytes for safer lithium metal batteries.
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