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Synergistic Alloying-Ferroelectric Ag-BST Layer for Enhanced Li|LATP Interface Stability and Ion Transport
Geng Li1, Xian-Ao Li1, Kepin Zhu1
1Key Laboratory of Engineering Dielectric and Applications (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, P. R. China.
ACS Applied Materials & Interfaces
|November 22, 2025
Summary
Researchers developed a dual-interface strategy using Ba0.5Sr0.5TiO3 and Ag layers to stabilize lithium metal anodes in solid-state lithium metal batteries (SSLMBs). This approach prevents dendrite growth and enhances battery lifespan and safety.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Lithium aluminum titanium phosphate (LATP) is a promising solid electrolyte for solid-state lithium metal batteries (SSLMBs) due to its stability and performance.
- Interfacial reactions and lithium dendrite penetration between LATP and lithium metal hinder the practical application of SSLMBs, especially under fast-charging conditions.
Purpose of the Study:
- To address the interfacial challenges in LATP-based SSLMBs by proposing a dual-interface engineering strategy.
- To enhance the cycling stability and safety of solid-state lithium metal batteries.
Main Methods:
- A dual-interface modification strategy was employed using magnetron sputtering.
- A high-dielectric-constant Ba0.5Sr0.5TiO3 (BST) layer was deposited to homogenize electric field distribution.
- An Ag layer was introduced to react with lithium, forming a Li-Ag alloy for uniform lithium deposition.
Main Results:
- The synergistic modification effectively suppressed lithium dendrite formation.
- Symmetric cells demonstrated an ultralong cycling lifespan exceeding 7000 hours at 0.1 mA cm-2.
- High critical current densities of 2.6 mA cm-2 and 3.0 mA cm-2 were achieved.
- Full cells retained 63.9% of initial capacity after 1000 cycles at 0.5 C.
Conclusions:
- The proposed dual-interface engineering strategy significantly improves the interfacial stability and electrochemical performance of LATP-based SSLMBs.
- This approach offers an effective pathway for developing safe and durable solid-state lithium metal batteries.
