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Improving the Interfacial Stability between Lithium and Solid-State Electrolyte via Dipole-Structured Lithium Layer
Muqin Wang1, Zhe Peng1, Wenwei Luo2
1Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 17, 2020
Summary
A graphene oxide (GO) layer stabilizes lithium metal anodes in solid-state batteries (SSBs). This GO coating improves cycling performance and prevents interface decomposition, offering an alternative to expensive indium foils.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Solid-state batteries (SSBs) utilizing lithium (Li) metal anodes face challenges with unstable interfaces when paired with sulfide solid-state electrolytes (SSEs).
- Current solutions, like indium (In) foil, are costly and reduce battery energy density.
- Developing stable Li/SSE interfaces is crucial for high-performance SSBs.
Purpose of the Study:
- To investigate the use of graphene oxide (GO) as a protective layer for Li metal anodes in SSBs.
- To enhance the cycling stability and interfacial properties of Li metal anodes with sulfide SSEs.
- To provide a cost-effective and efficient alternative to In foil for stabilizing the Li/SSE interface.
Main Methods:
- Density functional theory (DFT) calculations to understand Li deposition on GO.
- Fabrication of a composite Li anode using a copper-cuprous oxide-GO (CCG) nanocomposite.
- Electrochemical testing of SSBs with CCG anodes and Li10GeP2S12 SSE.
Main Results:
- DFT predicted a dipole structure formation between Li and defective GO sheets due to GO's electron-withdrawing nature.
- The CCG composite Li anode demonstrated high coulombic efficiency (>99.5%) over 120 cycles.
- The sulfide SSE remained chemically stable, and the GO layer effectively protected the Li/SSE interface.
Conclusions:
- Graphene oxide wrapping on Li anodes creates a stable dipole structure, enhancing Li/SSE interface compatibility.
- The CCG composite anode with GO exhibits excellent cycling performance and stability, outperforming traditional methods.
- This GO-based strategy offers a promising, cost-effective solution for stabilizing Li metal anodes in sulfide SSBs.
