Surface segregation and sodium transport in NaxCoO2

Kemp, J.P.; Beal, D.J.; Cox, P. A.; Foord, J.S.

doi:10.1016/0042-207x(90)94072-x

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…The increase in sodium and oxygen amounts is explained by the formation of Na 2 O at the surface due to sodium segregation. 40 Taking the Na 2 O amount into account, the corrected stoichiometry of Na 0.86 CoO 1.86 and Na 0.74 CoO 2.07 for the non-annealed and annealed cathodes, respectively, was extracted from the analysis of the Na1s spectra in Figs. 4a and 4b.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline Na_xCoO₂ Thin-Film Cathodes

Kehne

Guhl

et al. 2019

J. Electrochem. Soc.

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A common way to improve the electrochemical performance of the Na x CoO 2 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 Na x CoO 2 thin-film cathodes having two different degrees of crystallinity tuned by their post-deposition annealing at 700 • C. The Na x CoO 2 cathode thin-films were grown by pulsed laser deposition onto a bulk Na 3.4 Sc 0.4 Zr 1.6 (SiO 4 ) 2 (PO 4 ) (Nasicon) solid electrolyte substrates and assembled with sodium metal into a Swagelok battery cells. Cells with the low-crystalline Na x CoO 2 cathodes show discharge capacities of up to 124 mAh g −1 over 800 charge/discharged cycles. However, cells with highly crystalline Na x CoO 2 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 Na x CoO 2 films and Nasicon during cycling.

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Section: Resultsmentioning

confidence: 99%

Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline Na_xCoO₂ Thin-Film Cathodes

Kehne

Guhl

et al. 2019

J. Electrochem. Soc.

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“…Actually, material components are very similar in both cases, as the material components used as intercalation compounds can be obtained by substitution of Li and Na, like LiCoO 2 and NaCoO 2 [2], or other LiMO 2 and NaMO 2 with M a transition metal ion [3]. Owing to the higher energy densities obtained with LIBs, the efforts of research have soon been more focused on them, even though the research on SIBs has continued [4][5][6][7]. This can be understood if we note that Na + is heavier than Li + (23 g mol −1 against 6.9 g mol −1 ).…”

Section: Introductionmentioning

confidence: 99%

State-of-the-Art Electrode Materials for Sodium-Ion Batteries

Mauger

Julien

2020

Materials

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Sodium-ion batteries (SIBs) were investigated as recently as in the seventies. However, they have been overshadowed for decades, due to the success of lithium-ion batteries that demonstrated higher energy densities and longer cycle lives. Since then, the witness a re-emergence of the SIBs and renewed interest evidenced by an exponential increase of the publications devoted to them (about 9000 publications in 2019, more than 6000 in the first six months this year). This huge effort in research has led and is leading to an important and constant progress in the performance of the SIBs, which have conquered an industrial market and are now commercialized. This progress concerns all the elements of the batteries. We have already recently reviewed the salts and electrolytes, including solid electrolytes to build all-solid-state SIBs. The present review is then devoted to the electrode materials. For anodes, they include carbons, metal chalcogenide-based materials, intercalation-based and conversion reaction compounds (transition metal oxides and sulfides), intermetallic compounds serving as functional alloying elements. For cathodes, layered oxide materials, polyionic compounds, sulfates, pyrophosphates and Prussian blue analogs are reviewed. The electrode structuring is also discussed, as it impacts, importantly, the electrochemical performance. Attention is focused on the progress made in the last five years to report the state-of-the-art in the performance of the SIBs and justify the efforts of research.

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Sol–gel synthesis of sodium and lithium based materials

Hildebrandt

Eva

Komissinskiy

et al. 2012

J Sol-Gel Sci Technol

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Surface segregation and sodium transport in NaxCoO2

Cited by 4 publications

References 9 publications

Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline Na_xCoO₂ Thin-Film Cathodes

Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline Na_xCoO₂ Thin-Film Cathodes

State-of-the-Art Electrode Materials for Sodium-Ion Batteries

Sol–gel synthesis of sodium and lithium based materials

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Surface segregation and sodium transport in NaxCoO2

Cited by 4 publications

References 9 publications

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

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

State-of-the-Art Electrode Materials for Sodium-Ion Batteries

Sol–gel synthesis of sodium and lithium based materials

Contact Info

Product

Resources

About

Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline Na_xCoO₂ Thin-Film Cathodes

Electrochemical Performance of All-Solid-State Sodium-Ion Model Cells with Crystalline Na_xCoO₂ Thin-Film Cathodes