Improved Interface Stability and Room-Temperature Performance of Solid-State Lithium Batteries by Integrating...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Poor interface stability between electrodes and solid electrolytes is a major limitation in solid-state lithium battery performance.
• This instability leads to high interfacial resistance and hinders efficient ion transport, impacting battery efficiency and lifespan.

Purpose of the Study:

• To propose a novel approach for enhancing interface stability in solid-state lithium batteries.
• To improve the electrochemical performance of solid-state lithium batteries through optimized electrode/electrolyte integration.

Main Methods:

• Developed a hybrid structure by creating an electrolyte buffer layer on the cathode and a graphite coating on the solid electrolyte.
• Investigated the effect of this integrated structure on interfacial resistance, lithium metal plating/stripping stability, and lithium dendrite inhibition.
• Fabricated and tested solid-state lithium batteries with the novel interface design.

Main Results:

• The hybrid structure significantly improved electrode/electrolyte integration and interface stability.
• Interfacial resistance was dramatically reduced, and lithium metal plating/stripping stability was enhanced.
• Lithium dendrite growth was inhibited, and the battery demonstrated improved rate performance (0.5–4 C) and stable cycling (100 mAh g⁻¹ after 200 cycles at 1 C).

Conclusions:

• The proposed integrated electrode/electrolyte design effectively addresses interface stability issues in solid-state lithium batteries.
• This approach offers a promising strategy for enhancing the room-temperature electrochemical performance and cycle life of solid-state batteries.
• The method is expected to be widely applicable for advancing solid-state battery technology.