Elastic NaMoS₂-Carbon-BASE Triple Interface Direct Robust Solid-Solid Interface for All-Solid-State Na-S Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• All-solid-state sodium batteries face challenges with sodium-ion transport across solid-solid interfaces, limiting their development.
• Incompatible interfaces lead to poor conductivity and premature battery failure.

Purpose of the Study:

• To address the limitations of solid-solid interfaces in all-solid-state sodium batteries.
• To enhance sodium-ion transport and electrode stability for improved battery performance.

Main Methods:

• Developed a triple NaMoS₂-carbon-β″-Al₂O₃ solid electrolyte (BASE) nanojunction interface.
• Constructed ternary sodium electrodes with MoS₂ and carbon on BASE, optimizing contact angles.
• Utilized advanced sulfur cathodes with a sodium-ion conductive binder and redox catalytic mediator.

Main Results:

• Achieved improved elasticity and intimate solid contact in ternary sodium electrodes.
• Demonstrated synergistic ionic/electronic diffusion paths via NaMoS₂ and carbon, enhancing stability.
• Observed reduced charge-transfer resistance, over 90% sodium stripping utilization, and 200 hours of stable cycling for sodium metal.
• Enabled 1100 mAh/g cycling in all-solid-state sodium-sulfur batteries.

Conclusions:

• The novel triple nanojunction interface strategy effectively overcomes solid-solid interface challenges in all-solid-state sodium batteries.
• This approach significantly improves sodium-ion transport, electrode integrity, and overall battery performance and cycle life.