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Updated: Dec 17, 2025

Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy

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Published on: January 20, 2023

Precursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries.

Chung Bum Lim¹, Yong Joon Park²

¹Department of Advanced Materials Engineering, Graduate School Kyonggi University, 154-42, Gwanggyosan-Ro, Yeongtong-Gu, Suwon-Si, Gyeonggi-Do, 16227, Republic of Korea.

Scientific Reports

|July 1, 2020

Summary

Surface modification of cathodes using precursor-based (PB) Ta and W coatings enhances all-solid-state battery performance by stabilizing the interface with sulfide electrolytes, reducing side reactions and improving battery life.

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Area of Science:

Materials Science
Electrochemistry
Battery Technology

Background:

Sulfide ionic conductors offer high conductivity for solid-state batteries.
Interfacial instability between reactive sulfide electrolytes and cathodes hinders battery performance.
Surface modification is crucial for suppressing side reactions at the cathode/electrolyte interface.

Purpose of the Study:

To introduce a precursor-based (PB) surface modification using Tantalum (Ta) and Tungsten (W) for cathode stabilization.
To investigate the formation and effectiveness of the Ta/W coating layer.
To evaluate the impact of this modification on battery performance and interfacial stability.

Main Methods:

Precursor-based (PB) surface modification of cathodes with Ta and W.
Heat-treatment to induce doping and coating layer formation.
Characterization using X-ray photoelectron spectroscopy (XPS) depth profiles and scanning transmission electron microscopy (STEM).
Electrochemical testing including capacity, rate capability, and cyclic performance evaluation.
Electrochemical impedance spectroscopy (EIS) to assess interfacial resistance.

Main Results:

Successful formation of a stable surface coating layer confirmed by XPS and STEM.
PB surface-modified electrodes exhibited enhanced capacity, rate capability, and cyclic performance.
Significant decrease in cell impedance after cycling due to the modification.
Reduction in undesirable reaction products at the interface, as evidenced by XPS analysis.
Stabilization of the cathode/sulfide electrolyte interface.

Conclusions:

Precursor-based (PB) surface modification with Ta and W effectively suppresses undesirable side reactions.
The Ta and W modification synergistically enhances cathode performance through doping and coating effects.
This approach stabilizes the cathode/sulfide electrolyte interface, paving the way for improved all-solid-state batteries.