Optimized Interfaces in Anti-Perovskite Electrolyte-Based Solid-State Lithium Metal Batteries for Enhanced...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Solid-state lithium metal batteries offer high energy density and safety, crucial for electric vehicles and consumer electronics.
• A key challenge is the poor interface between solid electrolytes and lithium metal electrodes, causing high internal resistance and limiting performance.
• This interfacial issue stems from poor solid-solid contact and mechanical/electrochemical instability.

Purpose of the Study:

• To develop a novel strategy to address the interfacial challenges in solid-state lithium metal batteries.
• To create a flexible and stable interface that enhances electrochemical performance.
• To improve the cycling stability and capacity retention of solid-state batteries.

Main Methods:

• An in situ "welding" strategy was employed to create a composite buffer layer.
• Microliter-level liquid electrolyte was transformed into an organic-inorganic composite buffer.
• The strategy was tested using symmetric lithium-metal batteries and full cells with LiFePO4 cathodes.

Main Results:

• The developed buffer layer provided a flexible and stable interface.
• Symmetric lithium-metal batteries exhibited good cycling performance for 400 hours at 0.4 mA cm⁻².
• Full batteries demonstrated significantly improved cycling endurance and capacity retention.

Conclusions:

• The in situ "welding" strategy effectively resolves interfacial issues in solid-state lithium metal batteries.
• The organic-inorganic composite buffer layer promotes enhanced electrochemical performance and stability.
• This approach paves the way for practical applications of high-performance solid-state batteries.