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Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline NaxCoO2 Thin-Film Cathodes

Kehne, P. and Guhl, C. and Ma, Q. and Tietz, F. and Alff, L. and Hausbrand, R. and Komissinskiy, P. (2019):
Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline NaxCoO2 Thin-Film Cathodes.
In: Journal of The Electrochemical Society, ECS - The Electrochemical Society, pp. A5328-A5332, 166, (3), ISSN 0013-4651, DOI: 10.1149/2.0491903jes, [Online-Edition: https://doi.org/10.1149/2.0491903jes],
[Article]

Abstract

A common way to improve the electrochemical performance of the NaxCoO2 thin-film cathodes is to increase their crystallinity. Here we present our study of the electrochemical performance of all-solid-state sodium ion batteries with NaxCoO2 thin-film cathodes having two different degrees of crystallinity tuned by their post-deposition annealing at 700°C. The NaxCoO2 cathode thin-films were grown by pulsed laser deposition onto a bulk Na3.4Sc0.4Zr1.6(SiO4)2(PO4) (Nasicon) solid electrolyte substrates and assembled with sodium metal into a Swagelok battery cells. Cells with the low-crystalline NaxCoO2 cathodes show discharge capacities of up to 124 mAh g−1 over 800 charge/discharged cycles. However, cells with highly crystalline NaxCoO2 cathodes revealed a significant capacity loss down to 9 mAh g−1 and a pronounced increase of the overpotential from 100 to 890 mV during the 200 cycles. The observed loss in capacity can be attributed to a strong increase of the interface resistance between the highly crystalline annealed NaxCoO2 films and Nasicon during cycling.

Item Type: Article
Erschienen: 2019
Creators: Kehne, P. and Guhl, C. and Ma, Q. and Tietz, F. and Alff, L. and Hausbrand, R. and Komissinskiy, P.
Title: Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline NaxCoO2 Thin-Film Cathodes
Language: English
Abstract:

A common way to improve the electrochemical performance of the NaxCoO2 thin-film cathodes is to increase their crystallinity. Here we present our study of the electrochemical performance of all-solid-state sodium ion batteries with NaxCoO2 thin-film cathodes having two different degrees of crystallinity tuned by their post-deposition annealing at 700°C. The NaxCoO2 cathode thin-films were grown by pulsed laser deposition onto a bulk Na3.4Sc0.4Zr1.6(SiO4)2(PO4) (Nasicon) solid electrolyte substrates and assembled with sodium metal into a Swagelok battery cells. Cells with the low-crystalline NaxCoO2 cathodes show discharge capacities of up to 124 mAh g−1 over 800 charge/discharged cycles. However, cells with highly crystalline NaxCoO2 cathodes revealed a significant capacity loss down to 9 mAh g−1 and a pronounced increase of the overpotential from 100 to 890 mV during the 200 cycles. The observed loss in capacity can be attributed to a strong increase of the interface resistance between the highly crystalline annealed NaxCoO2 films and Nasicon during cycling.

Journal or Publication Title: Journal of The Electrochemical Society
Volume: 166
Number: 3
Publisher: ECS - The Electrochemical Society
Uncontrolled Keywords: Batteries, Films, Solid-State Topics: General, sodium-ion, solid-state, thin-film
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 23 Jan 2019 08:27
DOI: 10.1149/2.0491903jes
Official URL: https://doi.org/10.1149/2.0491903jes
Additional Information:

This paper is part of the JES Focus Issue of Selected Papers from IMLB 2018.

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