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| Home > Publications database > Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline Na x CoO 2 Thin-Film Cathodes |
| Home > Publications database > Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline Na x CoO 2 Thin-Film Cathodes |
| Journal Article | FZJ-2019-03321 |
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2019
Electrochemical Soc.
Pennington, NJ
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Please use a persistent id in citations: http://hdl.handle.net/2128/22368 doi:10.1149/2.0491903jes
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.
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