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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Enhanced High-Temperature Cycling Stability of Garnet-Based All Solid-State Lithium Battery Using a Multi-Functional

Leqi Zhao¹, Yijun Zhong¹, Chencheng Cao¹

¹WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA, 6102, Australia.

Nano-Micro Letters

|February 19, 2024

Summary

This study introduces a flame-retardant additive to stabilize solid-state lithium-ion batteries. The new buffer layer enhances thermal stability and safety for high-performance energy storage.

Keywords:

Cathode electrolyte interlayer Cycling stability Flame-retardant additive Interfacial stability Solid-state battery

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Solid-state batteries offer enhanced safety over traditional lithium-ion batteries.
Unstable interfaces between electrodes and electrolytes remain a key challenge for solid-state battery performance.
Polymer interlayers in garnet-based all-solid-state lithium-ion batteries (ASSLBs) improve interfaces but raise thermal stability concerns.

Purpose of the Study:

To develop a thermally stable and flame-retardant buffer layer for garnet-based ASSLBs.
To investigate the effect of a multi-functional flame-retardant additive on the electrode-electrolyte interface.
To enhance the high-temperature performance and safety of ASSLBs.

Main Methods:

Incorporation of triphenyl phosphate additive into poly(ethylene oxide) as a buffer layer.
Electrochemical stability tests and cycling performance evaluations at elevated temperatures.
Interfacial thermal stability analysis and flammability tests.
Materials characterization to elucidate the stabilization mechanism.

Main Results:

Achieved high capacity retention: 98.5% after 100 cycles at 60°C and 89.6% after 50 cycles at 80°C.
Demonstrated safe and stable cycling up to 100°C.
Identified the mechanism for improved interfacial thermal stability.

Conclusions:

Multi-functional flame-retardant additives can effectively address interfacial challenges in ASSLBs at high temperatures.
The proposed buffer layer significantly enhances thermal stability and safety.
Optimizing thermal management in ASSLBs is crucial for safe, large-scale energy storage applications.