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In Situ Characterization of Interface Evolution in Argyrodite-Based All-Solid-State Li Batteries.
Di Huang1, Gao Liu1, Wei Tong1
1Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|September 23, 2024
Summary
Interfacial stability in solid-state lithium metal batteries is crucial. This study reveals how current density affects lithium plating morphology and chemical distribution at the solid electrolyte interface, guiding stable battery design.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Interfacial stability is a major challenge in all-solid-state lithium metal batteries.
- Solid electrolyte decomposition and lithium dendrite growth at interfaces cause cell failure.
Purpose of the Study:
- To investigate interfacial evolution during lithium plating/stripping in solid-state batteries.
- To elucidate the impact of current density on solid-electrolyte interfaces.
Main Methods:
- Development of an all-solid-state asymmetric in situ cell for direct visualization.
- Optical microscopy for real-time observation of lithium plating/stripping.
- Post-mortem analysis using scanning electron microscopy and energy-dispersive X-ray spectroscopy.
Main Results:
- Current density significantly influences lithium argyrodite interface evolution.
- Low current densities lead to LiCl-rich interfaces with cubic lithium.
- High current densities result in uniform elemental distribution and filamentary lithium growth.
Conclusions:
- The study elucidates dynamic interfacial evolution mechanisms in solid-state lithium metal batteries.
- Findings provide guidance for developing stable solid interfaces for improved battery performance.
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