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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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Interfacial Chemistry in Solid-State Batteries: Formation of Interphase and Its Consequences
Shaofei Wang1, Henghui Xu1, Wangda Li1
1Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712, United States.
Journal of the American Chemical Society
|December 19, 2017
Summary
Solid-state batteries face challenges with dendrite growth. This study reveals that stable solid electrolytes can accelerate dendrite formation, contrary to expectations, and proposes interphase design for robust battery development.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Solid electrolytes offer solutions for dendrite growth and electrolyte consumption in batteries.
- Solid electrolyte/electrode interfaces exhibit high resistance and complex morphology, hindering solid-state battery development.
Purpose of the Study:
- To investigate the dynamic interphase formation at solid electrolyte/electrode interfaces using advanced chemical analysis.
- To understand the influence of interphases on dendrite growth and electrochemical performance in solid-state batteries.
Main Methods:
- Ultrasensitive three-dimensional (3D) chemical analysis to study interphase dynamics.
- Thermodynamic analysis to evaluate interphase properties and their impact on dendrite formation.
Main Results:
- Contrary to general understanding, highly stable solid electrolytes with metal anodes promote faster dendrite formation due to reduced Li consumption and increased electric driving force.
- Interphase electronic and ionic conductivities significantly influence electrochemical performance and dendrite growth.
Conclusions:
- An ideal interphase for preventing dendrite growth requires low electronic conductivity, high ionic conductivity, chemical stability, dynamic thickness, and uniform coverage.
- This research provides a framework for designing interphases to overcome dendrite challenges in solid-state batteries.
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