A High-Performance Solid-State Secondary Battery Using a Triple-Phase-Interface Anode Displaying Excellent Capacity...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Solid-state sodium-ion batteries (SSSIBs) offer safety and cost advantages but face anode limitations.
• Poor electrochemical reversibility and sluggish kinetics in anodes hinder SSSIB performance.

Purpose of the Study:

• To engineer a novel anode material for SSSIBs with improved electrochemical performance.
• To address the critical bottlenecks of poor reversibility and kinetics in SSSIB anodes.

Main Methods:

• Fabrication of a CoS/Co9S8/SnS composite coated with nitrogen-doped carbon (CoS/Co9S8/SnS@NC).
• Construction of a triple-phase-interface heterostructure to enhance electron/ion transport.
• Electrochemical characterization using Na3PS4 solid electrolyte and Na3V2(PO4)3 cathode.

Main Results:

• The CoS/Co9S8/SnS@NC anode demonstrated a capacity of 441 mAh g-1 after 120 cycles at 0.5 A g-1.
• Superior rate capability with 348.7 mAh g-1 at 5.0 A g-1 was achieved.
• Excellent high-temperature tolerance (502 mAh g-1 after 50 cycles) and full-cell performance were observed.

Conclusions:

• The triple-phase-interface heterostructure synergistically enhances electric field networks, improving kinetics.
• The developed anode material offers a viable solution for high-performance SSSIBs.
• This work provides a general strategy for interface engineering in solid-state batteries.