Oxygen-Vacancy BaTiO₃ Interlayer

Stable Interface >4500 h

A BaTiO₃ interlayer with engineered oxygen vacancies and pre-adsorbed SiO₃²⁻ that builds a Si─O-rich SEI on Li anodes, simultaneously suppressing side reactions and promoting uniform Li⁺ transport.

Baolei, Xu · Yaqin, Wu · Xie, Zeqiang · Liang, Chaoping · Chen, Libao · Zhang, Chunxiao · Liangjun, Zhou · Wei, Weifeng

Advanced Functional Materials 2026

Specifications

Li-Li cell cycling lifespan

{'zh': '4500', 'en': '4500'} h

Capacity retention after 1000 cycles (LiFePO₄||Li)

{'zh': '85', 'en': '85'} %

Capacity retention after 1900 cycles (LiFePO₄||Li)

{'zh': '70', 'en': '70'} %

Advantages

Suppresses interfacial side reactions

The Si─O-rich SEI reduces continuous reactions between electrolyte and Li metal, thereby extending cycling life.

Promotes uniform Li⁺ transport

The BTOVSi layer enriches Li⁺ concentration at the interface and, combined with Si─O bonds, provides fast transport pathways, promoting uniform Li deposition and suppressing dendrites.

Extended cycling stability

Li-Li cells achieve over 4500 h at 5.0 mA cm⁻² and 1.0 mAh cm⁻², demonstrating greatly enhanced interfacial stability.

Applications

• Lithium metal batteries：Provides a stable interface for Li anodes, directly extending battery cycle life.
• High-energy-density storage：Enables long-term stable operation of high-energy-density lithium metal batteries.
• Battery interface engineering：Offers a strategy to regulate interfacial ion distribution and SEI composition via a functional layer.
• Solid-state batteries：The interface stabilization strategy can be transferred to solid-state battery systems to alleviate interfacial contact issues.