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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Published on: August 12, 2013

Naturally diffused sintering aid for highly conductive bilayer electrolytes in solid oxide cells.

Junseok Kim^1,2, Seunghyeok Im^1,3, Seol Hee Oh¹

¹Center for Energy Materials Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea.

Science Advances

|October 1, 2021

Summary

A novel sintering aid strategy enables defect-free solid oxide cell (SOC) electrolytes. This breakthrough lowers operating temperatures for efficient fuel cell and electrolysis applications.

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Area of Science:

Materials Science
Electrochemistry
Energy Conversion

Background:

Solid oxide cells (SOCs) are crucial for sustainable energy conversion.
Bilayer electrolytes are key to lowering SOC operating temperatures and enhancing performance.
Conventional fabrication methods struggle to create ideal bilayer electrolytes cost-effectively.

Purpose of the Study:

To develop a cost-effective method for fabricating defect-free bilayer electrolytes for SOCs.
To improve the structural and chemical integrity of doped-zirconia/doped-ceria bilayers.
To enable lower operating temperatures and higher performance in SOCs.

Main Methods:

A novel sintering aid strategy utilizing naturally diffused sintering aids.
Fabrication of defect-free doped-zirconia/doped-ceria bilayer electrolytes.
Achieving congruent thermal shrinkage between the zirconia and ceria layers.
Co-sintering at lower temperatures to minimize interdiffusion.

Main Results:

Successfully fabricated fully dense, defect-free bilayer electrolytes.
Minimized the interdiffusion layer between the doped zirconia and doped ceria.
Achieved congruent thermal shrinkage, preventing delamination.
Resulting SOCs demonstrated minimal ohmic loss (0.09 ohm cm²).

Conclusions:

The developed sintering aid strategy enables high-performance SOCs at reduced operating temperatures.
This method offers a cost-effective route to advanced bilayer electrolytes.
The fabricated SOCs show excellent performance in both fuel cell and electrolysis modes at 700°C.