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Dynamic formation of a solid-liquid electrolyte interphase and its consequences for hybrid-battery concepts
Martin R Busche1, Thomas Drossel1, Thomas Leichtweiss1
1Institute of Physical Chemistry, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany.
Nature Chemistry
|April 23, 2016
Summary
Future high-energy batteries face challenges with hybrid electrolytes. A resistive solid-liquid electrolyte interphase (SLEI) forms at the interface, hindering battery performance and cycling rates.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Battery operation relies on ion transfer across phase boundaries.
- Conventional lithium-ion batteries utilize liquid electrolytes.
- Hybrid electrolytes combining liquid and solid components are explored for future high-energy batteries.
Purpose of the Study:
- Investigate the stability and properties of the interface between solid and liquid electrolytes in hybrid battery systems.
- Understand the formation and impact of the solid-liquid electrolyte interphase (SLEI) on battery performance.
- Analyze the factors influencing SLEI chemistry and kinetics.
Main Methods:
- Utilized impedance studies in a two-chamber cell to analyze interphase kinetics.
- Employed state-of-the-art surface analysis techniques.
- Conducted depth profiling to examine SLEI chemistry and growth.
- Investigated the influence of water impurities on SLEI formation.
Main Results:
- The interface between fast-ion-conducting solid electrolytes and liquid electrolytes is chemically unstable.
- A resistive solid-liquid electrolyte interphase (SLEI) forms at this interface.
- The SLEI significantly decreases the cycling-rate capability of hybrid electrolytes.
- SLEI chemistry, growth kinetics, and the effect of water impurities were characterized.
Conclusions:
- The formation of a resistive SLEI is a critical challenge for hybrid electrolytes in high-energy batteries.
- Understanding and mitigating SLEI formation is crucial for improving the cycling-rate capability of next-generation batteries.
- Further research is needed to develop stable solid-liquid electrolyte interfaces.
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