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Quantitative Analysis of Microstructures and Reaction Interfaces on Composite Cathodes in All-Solid-State Batteries
Sungjun Choi1, Minjae Jeon, Junsung Ahn
1Department of Chemical Engineering , Hanyang University , 222 Wangsimni-ro , Seongdong-gu, Seoul 04763 , Republic of Korea.
ACS Applied Materials & Interfaces
|July 10, 2018
Summary
Quantitative analysis of composite cathodes in all-solid-state batteries reveals that structural properties significantly limit electrochemical performance due to poor component dispersion and packing, hindering interface percolation.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- All-solid-state batteries (ASSBs) require dense microstructures and percolated interfaces, unlike conventional lithium-ion batteries.
- Fabricating optimal composite cathodes for ASSBs presents significant challenges.
- Existing analyses of ASSB composite cathodes are primarily qualitative.
Purpose of the Study:
- To perform quantitative analyses of composite cathode microstructures and reaction interfaces in ASSBs.
- To identify structure-property relationships impacting electrochemical performance.
- To move beyond qualitative assessments with advanced 3D reconstruction techniques.
Main Methods:
- Utilized three-dimensional reconstruction analysis for quantitative assessment of composite cathodes.
- Analyzed microstructural features including volume ratio, connectivity, tortuosity, and pore formation.
- Investigated the impact of component dispersion and packing on interfacial properties.
Main Results:
- Successfully analyzed microstructures and reaction interfaces quantitatively.
- Predicted quantitative structure properties linked to material optimization and process development.
- Observed that poor dispersion and packing suppressed effective two-phase boundaries to approximately 23% of the total volume, limiting performance.
Conclusions:
- Quantitative analysis provides critical insights into ASSB composite cathode limitations.
- Material optimization and process development must address component dispersion and packing for improved interface percolation.
- Achieving high electrochemical performance necessitates overcoming microstructural challenges in ASSB cathodes.
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