Advancing lithium metal batteries with in situ polymerized PMMA-based elastomericelectrolytes

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Solid-state lithium metal batteries (LMBs) require advanced electrolytes for improved safety and performance.
• Current electrolytes often face challenges with ionic conductivity and interface stability.

Purpose of the Study:

• To develop a novel poly(methyl methacrylate) (PMMA)-based solid-state elastomer electrolyte for LMBs.
• To enhance Li+ transport and interfacial stability for high-performance LMBs.

Main Methods:

• A denture-inspired protocol using a deep eutectic electrolyte (DEE) composed of succinonitrile and LiTFSI.
• Optimization of DEE and MMA molar ratios to achieve a "polymer-in-salt" structure.
• Characterization using electron microscopy, small-angle X-ray scattering, and Raman spectroscopy.
• In situ polymerization for robust electrode adhesion.

Main Results:

• Achieved high ionic conductivity (0.497 mS cm-1 at 30 °C) with continuous Li+ transport pathways.
• Demonstrated excellent compatibility and stability with high-voltage cathodes and Li anodes.
• Superior cycling performance in LMBs due to stable solid-electrolyte interface formation.

Conclusions:

• The novel denture-inspired protocol successfully yields high-performance solid-state elastomer electrolytes.
• The developed electrolytes offer a promising pathway for the commercialization of safer and more efficient LMBs.
• Insights into ion transport mechanisms and interfacial engineering are provided.