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Stabilizing the Bilateral Interfaces by a PVDF-Based Double-Layer Solid Composite Electrolyte with a Relieved
Yan Yuan1, Xuyi Liu1, Xinyi Dong1
1School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
ACS Applied Materials & Interfaces
|October 17, 2024
Summary
A novel double-layer solid electrolyte using poly(acrylic acid) and lithium difluoro(oxalato)borate enhances poly(vinylidene fluoride) stability. This improves solid-state lithium metal battery performance and cycle life at room temperature.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Poly(vinylidene fluoride) (PVDF) based solid composite electrolytes (SCEs) suffer from dehydrofluorination caused by alkaline ceramic fillers.
- This degradation compromises the properties of SCEs and hinders the performance of solid-state lithium metal batteries (SLMBs).
Purpose of the Study:
- To develop a stable PVDF-based double-layer solid electrolyte for improved SLMB performance.
- To mitigate the dehydrofluorination of PVDF and enhance electrode compatibility.
Main Methods:
- Fabrication of a unique PVDF-based double-layer solid electrolyte.
- Incorporation of poly(acrylic acid) (PAA) as an alkalinity-scavenging agent near the Li anode.
- Addition of lithium difluoro(oxalato)borate (LiDFOB) as a film-forming additive facing the cathode.
Main Results:
- Poly(acrylic acid) effectively reduced the dehydrofluorination of the PVDF matrix, improving lithium plating/stripping reversibility.
- Lithium difluoro(oxalato)borate facilitated the formation of a stable passivation film on the cathode.
- The double-layer SCE exhibited excellent compatibility with both Li anode and cathode.
Conclusions:
- The developed double-layer solid electrolyte significantly enhances the stability and performance of SLMBs.
- The strategy effectively addresses PVDF degradation issues in ceramic-filled SCEs.
- The SLMBs demonstrated superior cycle and rate performance at room temperature.
