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

Xiaofei Huang¹, Tianli Han¹, Xiang Fang²

¹Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)

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Summary

This summary is machine-generated.

Researchers developed a novel nitrogen-doped carbon-coated composite anode for solid-state sodium-ion batteries (SSSIBs). This triple-phase-interface heterostructure significantly enhances electrochemical performance and ion transport kinetics, addressing key bottlenecks in SSSIB technology.

Keywords:

capacity electron/ion transport energy storage hetero‐interface solid‐state battery

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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.