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Stabilizing the Interface of NASICON Solid Electrolyte against Li Metal with Atomic Layer Deposition
Yulong Liu1, Qian Sun1, Yang Zhao1
1Department of Mechanical and Materials Engineering , University of Western Ontario , London , Ontario N6A 5B9 , Canada.
ACS Applied Materials & Interfaces
|August 25, 2018
Summary
Atomic layer deposition (ALD) stabilizes lithium aluminum titanium phosphate (LATP) solid electrolytes by coating them with Al2O3. This ALD coating enhances interface stability and battery performance, crucial for next-generation solid-state batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state batteries offer enhanced safety and energy density.
- Solid-state electrolytes are critical for battery performance, requiring high ionic conductivity and stability.
- Lithium aluminum titanium phosphate (LATP) is a promising solid electrolyte but suffers from chemical instability with lithium metal.
Purpose of the Study:
- To stabilize the LATP/Li metal interface using atomic layer deposition (ALD).
- To investigate the effect of ALD-Al2O3 coating on LATP's electrochemical performance and interfacial stability.
- To understand the mechanism of interface stabilization.
Main Methods:
- Atomic Layer Deposition (ALD) of Al2O3 on LATP.
- Electrochemical cycling and impedance spectroscopy.
- Advanced characterization using high-resolution transmission electron microscopy-electron energy loss spectroscopy (HRTEM-EELS).
Main Results:
- ALD-Al2O3 coating significantly improved the cycling stability of LATP against Li metal.
- The coated LATP exhibited reduced voltage hysteresis and stable resistance over 600 hours.
- Characterization revealed suppressed lithium penetration and Ti4+ reduction at the interface.
- ALD effectively enhances the solid-state electrolyte/electrode interface stability.
Conclusions:
- ALD coating is a highly effective strategy for stabilizing the LATP/Li metal interface.
- This method significantly improves the performance and durability of solid-state batteries utilizing LATP electrolytes.
- The findings pave the way for practical applications of LATP in high-performance solid-state batteries.
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