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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
Published on: January 20, 2023
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Tuning the Covalent Coupling Degree between the Cathode and Electrolyte for Optimized Interfacial Resistance in
Zhuohao Xie1,2, Weicai Zhang1,2, Yansen Zheng1,2
1Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, Guangdong, China.
ACS Applied Materials & Interfaces
|June 12, 2023
Summary
Researchers developed a new method to improve solid-state lithium battery performance by strengthening the cathode/solid-state electrolyte interface using covalent interactions. This significantly reduced interfacial resistance, even below that of liquid electrolytes.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state lithium batteries offer enhanced safety and energy density but face challenges.
- Poor interfacial contact and high resistance at the electrode/solid-state electrolyte (SSE) interface hinder their development.
Purpose of the Study:
- To introduce covalent interactions at the cathode/SSE interface to reduce interfacial impedance.
- To investigate the effect of varying covalent coupling degrees on interfacial properties.
Main Methods:
- Introducing covalent interactions with tunable coupling degrees at the cathode/SSE interface.
- Characterizing interfacial impedance using electrochemical techniques.
Main Results:
- Achieved significantly reduced interfacial impedances by strengthening cathode/SSE interactions.
- An optimal interfacial impedance of 33 Ω cm-2 was obtained, surpassing liquid electrolytes (39 Ω cm-2).
Conclusions:
- Covalent interactions effectively mitigate interfacial issues in solid-state lithium batteries.
- This strategy offers a promising approach to enhance the performance of solid-state batteries.
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