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Halide and Sulfide Electrolytes in Cathode Composites for Sodium All-Solid-State Batteries and their Stability
Laura E Goodwin1,2, Maya Ziegler1,2, Paul Till3
1Institute for Physical Chemistry, Justus Liebig University Giessen, Giessen 35392, Germany.
ACS Applied Materials & Interfaces
|April 4, 2024
Summary
Sodium all-solid-state batteries offer safer, high-density energy storage. Sodium halide electrolytes like Na2.4Er0.4Zr0.6Cl6 demonstrate improved stability and cycling performance in cathodes, reducing interfacial resistance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium all-solid-state batteries (ASSBs) present a promising alternative to liquid-based sodium-ion batteries, addressing safety and energy density concerns.
- Sulfide electrolytes, while conductive, suffer from interface degradation. Sodium halide electrolytes offer enhanced stability and wider potential windows.
Purpose of the Study:
- To investigate interface reactions between sodium halide electrolytes and transition metal oxide cathodes.
- To evaluate the cycling performance of full cells utilizing Na3SbS4 and Na2.4Er0.4Zr0.6Cl6 as catholytes.
Main Methods:
- Utilized X-ray spectroscopy, time-of-flight spectrometry, and impedance spectroscopy to analyze electrode-electrolyte interfaces.
- Conducted full-cell cycling performance tests.
- Performed impedance measurements to study separator-catholyte interactions.
Main Results:
- Cathodes employing Na2.4Er0.4Zr0.6Cl6 exhibited superior stability at low C-rates compared to Na3SbS4.
- Lower interfacial resistance was observed with Na2.4Er0.4Zr0.6Cl6.
- Improved cycling performance was achieved using Na2.4Er0.4Zr0.6Cl6.
Conclusions:
- Sodium halide electrolytes, particularly Na2.4Er0.4Zr0.6Cl6, show significant potential for stable and high-performance sodium all-solid-state batteries.
- Na2.4Er0.4Zr0.6Cl6 effectively mitigates interfacial resistance and degradation issues common in ASSBs.
- This research highlights Na2.4Er0.4Zr0.6Cl6 as a promising catholyte material for next-generation sodium-ion energy storage.
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