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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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PVDF-HFP Based, Quasi-Solid Nanocomposite Electrolytes for Lithium Metal Batteries
Eleonora Carena1,2, Lorenzo Mezzomo1,2, Nicholas Vallana1,2
1Department of Materials Science of University of Milano Bicocca, Via Cozzi 55, Milano, 20125, Italy.
Small (Weinheim an Der Bergstrasse, Germany)
|February 27, 2024
Summary
This study developed advanced quasi-solid electrolytes (QSEs) using PVDF-HFP and pegylated SiO2 nanoparticles for solid-state lithium metal batteries (LMBs). The nanocomposites demonstrate enhanced conductivity and dendrite resistance, promising safer, long-lasting batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Solid-state lithium metal batteries (LMBs) require advanced electrolytes for improved safety and performance.
- Composite polymer electrolytes, particularly quasi-solid electrolytes (QSEs) based on PVDF-HFP, are promising candidates.
- Enhancing the mechanical and ion transport properties of QSEs is crucial for practical applications.
Purpose of the Study:
- To develop novel QSEs by incorporating pegylated SiO2 nanoparticles into a PVDF-HFP matrix.
- To investigate the impact of poly(ethylene glycol) (PEG) chain length on the properties of SiO2 nanofillers.
- To evaluate the electrochemical performance and stability of the resulting nanocomposite electrolytes in LMBs.
Main Methods:
- Synthesis of silica nanoparticles functionalized with poly(ethylene glycol) methyl ether (PEG) of varying molecular weights.
- Preparation of PVDF-HFP/pegylated SiO2 nanocomposite electrolytes via solvent-casting.
- Characterization of ionic conductivity, mechanical properties, and electrochemical stability (dendrite penetration, cycling performance).
Main Results:
- Grafting PEG chains onto SiO2 nanoparticles improved the mechanical and electrochemical properties of PVDF-HFP based QSEs.
- The optimal formulation, 5 wt% SiO2 functionalized with short PEG chains (PEG750), exhibited an ionic conductivity of 0.1 mS cm-1 at 25 °C.
- This formulation demonstrated over 250 hours of resistance to lithium stripping/plating and promising cycling stability in LMBs with LiFePO4 cathodes.
Conclusions:
- Pegylated SiO2 nanoparticles effectively enhance the performance of PVDF-HFP based quasi-solid electrolytes.
- The developed nanocomposite electrolytes offer a viable pathway towards safer and more efficient solid-state lithium metal batteries.
- The tailored functionalization of nanofillers provides a strategy for optimizing electrolyte properties for energy storage applications.
