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Efficient Construction of a C60 Interlayer for Mechanically Robust, Dendrite-free, and Ultrastable Solid-State
Zhenlong Li1, Siwei Zhang1, Kun Qian2
1Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China.
Iscience
|October 26, 2020
Summary
A C60 interlayer on solid electrolytes effectively stabilizes the lithium metal interface, preventing dendrite growth and enabling ultra-stable solid-state batteries with long cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Interfacial instability between solid electrolytes (SEs) and lithium metal is a major obstacle for solid-state battery development.
- Achieving stable interfaces is crucial for high-performance and safe lithium metal batteries.
Purpose of the Study:
- To develop a stable interface between Li1.5Al0.5Ge1.5(PO4)3 (LAGP) solid electrolyte and lithium metal.
- To enhance the cycling performance and safety of solid-state batteries.
Main Methods:
- A conformal C60 interlayer was fabricated on LAGP SEs using physical vapor deposition.
- An ionically conducting LixC60 matrix was formed with lithium metal to ensure ideal interfacial contact.
- Electrochemical performance of Li/LAGP-C60/Li symmetric and Li/LAGP-C60/LiFePO4 full cells was evaluated.
Main Results:
- The LixC60 interlayer effectively suppressed lithium dendrite growth and mitigated interfacial stress.
- Li/LAGP-C60/Li symmetric cells exhibited over 4,500 hours of stable cycling at 0.034 mA cm-2.
- Li/LAGP-C60/LiFePO4 full cells achieved a reversible capacity of 152.4 mAh g-1 and 85% retention after 100 cycles.
Conclusions:
- The C60 interlayer provides a feasible and scalable strategy to improve the solid electrolyte/lithium metal interface.
- This approach significantly enhances the stability and performance of solid-state batteries.
