Ultraviolet-Cured Semi-Interpenetrating Network Polymer Electrolytes for High-Performance Quasi-Solid-State Lithium Metal Batteries | JoVE Visualize

Ultraviolet-Cured Semi-Interpenetrating Network Polymer Electrolytes for High-Performance Quasi-Solid-State Lithium Metal Batteries

Hui-Xin Xie¹, Qian-Gang Fu², Zhuo Li¹

¹School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)|March 29, 2021

View abstract on PubMed

Summary

This study introduces a novel semi-interpenetrating network polymer (SNP) electrolyte for lithium metal batteries. The SNP electrolyte offers high ionic conductivity and mechanical flexibility, overcoming limitations of traditional solid polymer electrolytes.

Area of Science:

Materials Science
Electrochemistry
Polymer Chemistry

Background:

Solid polymer electrolytes (SPEs) face challenges with low ionic conductivity and poor mechanical properties, hindering lithium metal battery applications.
Existing SPEs often exhibit limited ion transport and electrochemical stability at room temperature.
Developing flexible and conductive electrolytes is crucial for next-generation energy storage.

Purpose of the Study:

To design and synthesize a novel semi-interpenetrating network polymer (SNP) electrolyte.
To enhance ionic conductivity, mechanical flexibility, and electrochemical stability for lithium metal batteries.
To investigate the structure-property relationships in the SNP electrolyte for improved battery performance.

Main Methods:

Fabrication of SNP electrolyte using ultraviolet-crosslinked ethoxylated trimethylolpropane triacrylate and polyvinylidene fluoride-co-hexafluoropropylene.
Characterization of ionic conductivity, electrochemical stability window, and mechanical properties.
Assembly and testing of quasi-solid-state lithium metal batteries (LiFePO4/SNP/Li).

Main Results:

The SNP electrolyte achieved high ionic conductivity (1.12 mS cm⁻¹ at 30 °C) and a wide electrochemical stability window (4.6 V vs. Li⁺/Li).
The semi-interpenetrating network structure improved polymer chain dynamics and reduced crystallinity, enhancing ion transport.
Assembled LiFePO4/SNP/Li batteries demonstrated good cycling stability and rate capability at room temperature.

Conclusions:

The developed SNP electrolyte effectively addresses the limitations of conventional solid polymer electrolytes.
The SNP electrolyte shows significant potential for high-performance, safe, and flexible quasi-solid-state lithium metal batteries.
The findings offer a promising pathway for advanced solid-state battery technologies.