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In Situ Construction of Gradient Sulfide/Alloy Interfacial Layer for Stable Solid-State Lithium Metal Batteries
Aonan Wang1, Zhenming Xu2, Jialong Cao1
1School of Metallurgy and Environment, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, Central South University, Changsha 410083, P. R. China.
ACS Applied Materials & Interfaces
|October 14, 2025
Summary
Researchers developed a new method for creating stable interfaces in solid-state lithium metal batteries. This approach enhances lithium-ion transport and battery longevity, paving the way for safer and more efficient energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state lithium metal batteries face challenges due to poor interfacial compatibility and slow lithium-ion (Li+) transport.
- Existing artificial interfacial layers, like Li alloy and sulfide-containing layers, show potential but are difficult to construct controllably and thinly.
Purpose of the Study:
- To develop a facile method for creating a stable, ultrathin, sulfide-based interfacial layer on solid electrolytes.
- To enhance lithium-ion transport kinetics and stabilize the lithium anode interface in composite solid electrolytes.
Main Methods:
- An in-situ film-formation approach was employed, electrochemically covering antimony trisulfide (Sb2S3) within a composite solid electrolyte (SbS@CSE).
- This method facilitates the formation of a gradient Li2S/Li3Sb-rich interfacial layer.
Main Results:
- The gradient interfacial layer effectively uniformized Li+ flow and stabilized the lithium anode.
- The Li/SbS@CSE/Li symmetric cell demonstrated an improved critical current density (0.8 mA cm-2) and stable cycling (>1200 h).
- All-solid-state LiFePO4/SbS@CSE/Li batteries maintained 90.4% capacity after 700 cycles at 1 C and 60 °C.
Conclusions:
- The proposed facile in-situ electrochemical method enables controllable construction of gradient sulfide-rich interfacial layers.
- This approach significantly enhances the interfacial stability and Li+ transport, leading to superior cycling performance in solid-state lithium metal batteries.
