Crosslinked Zwitterionic PVA-g-SBMA/PEDOT:PSS Networks for Mechanically Robust All-Solid-State Electrolytes.

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Conventional lithium-ion batteries suffer from electrolyte leakage and interface instability.
• Solid-state polymer electrolytes (SPEs) offer enhanced safety and flexibility for next-generation energy storage.
• Developing robust SPEs with high ionic conductivity is crucial for advancing battery technology.

Purpose of the Study:

• To synthesize and characterize a novel graft copolymer, poly(vinyl alcohol)-graft-[2-(methacryloyloxy)ethyl] dimethyl-(3-sulfopropyl)ammonium hydroxide (PVA-g-SBMA).
• To improve the mechanical properties of the synthesized SPE through crosslinking for enhanced device stability.
• To investigate the ionic conductivity and performance of the crosslinked SPE in solid-state lithium battery applications.

Main Methods:

• Synthesis of PVA-g-SBMA via grafting of SBMA onto PVA.
• Characterization using 1H NMR spectra and aqueous Gel Permeation Chromatography (GPC).
• Crosslinking of the graft copolymer using (3-glycidyloxypropyl)trimethoxysilane (GOPS) and PEDOT:PSS, followed by electrochemical impedance spectroscopy (EIS) measurements.

Main Results:

• Successful synthesis of PVA-g-SBMA with a grafting efficiency of 25% and a number average molecular weight (Mn) of 15,755.
• Crosslinking significantly improved the mechanical properties of the initially brittle membranes.
• The optimized crosslinked SPE (0.1 wt% PEDOT:PSS, 0.015 wt% LiTFSI) achieved an ionic conductivity of 4.9 × 10^-4 S/cm at room temperature.

Conclusions:

• The developed crosslinked PVA-g-SBMA exhibits promising properties as a solid-state electrolyte.
• The combination of PVA's film-forming ability and SBMA's zwitterionic nature enhances ion transport.
• This research presents a viable strategy for creating mechanically robust and conductive SPEs for safer and more efficient energy storage devices.