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Tailoring Conversion-Reaction-Induced Alloy Interlayer for Dendrite-Free Sulfide-Based All-Solid-State Lithium-Metal
Yuhao Liang1, Chen Shen2, Hong Liu1
1Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Advanced Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 21, 2023
Summary
This study engineered a new interlayer for solid-state batteries to prevent lithium dendrites during charging. The tailored interlayer improves battery stability by controlling surface properties and enabling uniform lithium deposition.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Lithium metal anodes in sulfide solid-state batteries face dendrite issues at high charge rates.
- Existing interlayers lack established correlations between properties and lithium deposition behavior.
Purpose of the Study:
- To establish a correlation between conversion-reaction-induced (CRI) interlayer properties and lithium deposition in all-solid-state lithium-metal batteries (ASSLBs).
- To engineer a tailored CRI-alloy interlayer for enhanced dendritic tolerance and improved battery cycling stability.
Main Methods:
- Electrochemical characterization of LixAgy interlayers in various battery chemistries.
- Tailoring CRI-alloy interlayer structure by adjusting pit corrosion kinetics, transitioning from a solvation to an adsorption model.
- Developing a hierarchical gradient structure with specific organic-rich outer and inorganic-rich inner layers.
Main Results:
- Identified surface roughness and electronic conductivity of CRI-alloy interlayers as key factors for dendritic tolerance.
- Created a hierarchical gradient interlayer with a smooth organic-rich outer layer and a composition-regulated inorganic-rich inner layer (LixAgy, LiF).
- Achieved simultaneous optimization of roughness, conductivity, and diffusivity, leading to dendrite-free, dense lithium deposition and improved cycling stability.
Conclusions:
- The study provides a rational protocol for engineering CRI-alloy interlayers for ASSLBs.
- Tailored interlayers significantly enhance lithium deposition behavior and battery performance.
- Understanding interlayer properties is crucial for developing stable and high-performance solid-state batteries.
