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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Solid/Solid Interfacial Architecturing of Solid Polymer Electrolyte-Based All-Solid-State Lithium-Sulfur Batteries by
Zengjie Fan1, Bing Ding1,2, Tengfei Zhang1
1Jiangsu Key Laboratory of Electrochemical Energy-Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
Small (Weinheim an Der Bergstrasse, Germany)
|October 1, 2019
Summary
Atomic layer deposition of Al2O3 on solid polymer electrolytes (SPEs) enhances all-solid-state lithium-sulfur batteries (ASSLSBs). This coating improves energy density and cycling life by suppressing lithium dendrites and polysulfide shuttling.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- All-solid-state lithium-sulfur batteries (ASSLSBs) offer high energy density but face challenges like the polysulfide shuttle effect and poor interfacial compatibility.
- Solid polymer electrolytes (SPEs) are crucial for ASSLSBs, yet their development for simultaneous improvements in energy density and cycling life remains limited.
Purpose of the Study:
- To address interfacial issues in SPE-based ASSLSBs using atomic layer deposition (ALD) of Al2O3.
- To enhance the electrochemical performance, specifically energy density and long-term cycling stability, of ASSLSBs.
Main Methods:
- Atomic layer deposition (ALD) of aluminum oxide (Al2O3) onto poly(ethylene oxide)-lithium bis(trifluoromethanesulfonyl)imide (PEO-LiTFSI) SPE surfaces.
- Fabrication and electrochemical testing of ASSLSBs utilizing the Al2O3-coated SPEs.
Main Results:
- Al2O3 coating effectively suppressed lithium dendrite formation for over 500 hours.
- ASSLSBs with Al2O3-coated SPEs exhibited high gravimetric/areal capacity and Coulombic efficiency.
- The modified ASSLSBs demonstrated excellent cycling stability and an extremely low self-discharge rate.
Conclusions:
- ALD of Al2O3 provides a simple and effective strategy to improve the electrochemical performance of SPE-based ASSLSBs.
- The study enhances fundamental understanding of the mechanisms behind improved performance in ASSLSBs.
- This approach offers a promising pathway for developing safer and more efficient solid-state batteries.
