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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Room-Temperature Solid-State Polymer Electrolyte in Li-LiFePO4 , Li-S and Li-O2 Batteries
Vittorio Marangon1,2, Luca Minnetti2, Edoardo Barcaro1
1University of Ferrara, Department of Chemical, Pharmaceutical and Agricultural Sciences, Via Fossato di Mortara 17, 44121, Ferrara, Italy.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 19, 2023
Summary
A novel solid polymer electrolyte using PEGDME, LiTFSI, and LiNO3 salts with SiO2 filler enhances lithium-metal battery performance. This material offers high ionic conductivity and stability for room-temperature solid-state cells.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Lithium-metal batteries are of significant interest for energy storage applications.
- Development of stable and efficient solid polymer electrolytes is crucial for next-generation batteries.
- Existing electrolytes often face challenges with ionic conductivity, stability, and interface resistance.
Purpose of the Study:
- To develop and characterize a novel solid polymer electrolyte for lithium-metal batteries.
- To evaluate the electrochemical performance and stability of the developed electrolyte.
- To demonstrate the applicability of the electrolyte in solid-state cells with various cathode materials.
Main Methods:
- Synthesis of a solid polymer electrolyte comprising crystalline poly(ethylene glycol)dimethyl ether (PEGDME), LiTFSI, LiNO3 salts, and SiO2 ceramic filler.
- Characterization of ionic conductivity, Li+ transference number, electrochemical stability window, and interfacial resistance.
- Thermogravimetric analysis (TGA) for thermal stability and FTIR spectroscopy for salt dissolution.
- Fabrication and testing of solid-state cells with LiFePO4, sulfur-carbon composite, and oxygen electrodes.
Main Results:
- The electrolyte exhibits ionic conductivity >10⁻⁴ S/cm at room temperature and ~10⁻³ S/cm at 60°C.
- Achieved a Li+ transference number >0.3, electrochemical stability up to 4.4 V vs. Li+/Li, and low overpotential for Li stripping/deposition (<0.08 V).
- Demonstrated stable operation in solid-state cells with LiFePO4 (140 mAh/g at 3.4 V), sulfur (400 mAh/g at 2 V), and oxygen (500 mAh/g at 2.5 V) cathodes at room temperature.
Conclusions:
- The developed solid polymer electrolyte shows promising properties for high-performance lithium-metal batteries.
- Its thermal stability (up to 200°C) and electrochemical performance are suitable for solid-state battery applications.
- The electrolyte is a viable candidate for room-temperature solid polymer cells utilizing various cathode chemistries.
