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Reactive and Adaptive Interphase Engineering for Regulating Interfacial Li+ Transport in Li2OHCl Antiperovskite
Liyuan Qian1, Xinyan Ye1, Xinyu Zhang2
1Shenzhen Key Laboratory of Solid State Batteries & Guangdong Provincial Key Laboratory of Energy Materials for Electric Power & Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices & Institute of Major Scientific Facilities for New Materials & Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen, China.
A new MoS2 interlayer stabilizes lithium metal anodes in solid-state batteries by regulating ion flow and forming a protective layer. This enhances battery cycling life and prevents dendrite growth for safer, more durable energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-rich antiperovskite solid electrolytes (e.g., Li2OHCl) show promise for solid-state lithium metal batteries.
- Interfacial instability between electrolytes and lithium metal, marked by dendrite growth, hinders practical application.
Purpose of the Study:
- To develop an adaptive interlayer for Li2OHCl to stabilize the lithium metal/solid-state electrolyte interface.
- To regulate interfacial Li+ transport and suppress lithium dendrite formation.
Main Methods:
- Introduction of a molybdenum disulfide (MoS2) interlayer between Li2OHCl and lithium metal.
- Investigation of MoS2's dual-regulated Li+ transport mechanism (bulk migration barrier and surface diffusion).
- Analysis of the composite interphase formed by MoS2 and lithium metal.
Main Results:
- The MoS2 interlayer homogenizes Li+ flux, suppressing dendrite initiation.
- A protective composite interphase (Li2S and Mo) lowers nucleation overpotential and enhances charge transfer.
- Lithium-metal symmetric cells achieved stable cycling over 1000 hours.
- All-solid-state lithium-metal full cells demonstrated significantly improved cycling stability.
Conclusions:
- Interfacial ion-transport regulation is a key design principle for stabilizing lithium metal anodes.
- The MoS2-enabled interlayer offers a viable strategy for interface engineering in antiperovskite solid-state batteries.
- This approach enhances the safety and performance of next-generation batteries.
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