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Tailoring electronic-ionic local environment for solid-state Li-O2 battery by engineering crystal structure
Xue Sun1,2, Yajie Song1, Qingsong Liu1
1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.
Science Advances
|September 2, 2022
Summary
Researchers developed a dual microenvironment to boost solid-state Li-O2 battery performance. This enhances oxygen electrolysis, improving capacity and cycle life for safer, high-energy batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state Li-O2 batteries (SSLOBs) offer high energy density and safety but suffer from sluggish kinetics.
- Challenges include inefficient oxygen reaction evolution at gas-solid interfaces and slow transport in solid electrodes.
Purpose of the Study:
- To enhance oxygen electrolysis in SSLOBs by creating a dual electronic-ionic microenvironment.
- To overcome kinetic limitations and improve the practical applicability of SSLOBs.
Main Methods:
- Designed a lithium-decorative catalyst with an engineered crystal structure.
- Engineered coordinatively unsaturated sites and high defect concentrations.
- Created a balanced gas-solid microenvironment for oxygen electrolysis.
Main Results:
- Substantially enhanced oxygen electrolysis in solid-state batteries.
- Alleviated limitations in electronic-ionic transport at solid interfaces.
- Facilitated oxygen reduction reaction, mediated species transport, and promoted discharge product decomposition.
- Achieved high specific capacity and stable cycling life.
Conclusions:
- The developed dual microenvironment strategy significantly improves SSLOB performance.
- Provides new insights into structure-property relationships for solid-state electrolysis.
- Paves the way for practical, high-performance SSLOBs.
