Scaling relation between renormalized discharge rate and capacity in NaxCoO2 films

Ayumu Yanagita, Takayuki Shibata, Wataru Kobayashi, Yutaka Moritomo

Research output: Contribution to journalArticle

Abstract

Layered cobalt oxide, P2-NaxCoO2, is a prototypical cathode material for sodium-ion secondary battery. We systematically investigated the rate dependence of the discharge capacity (Q) in three thin films of Na0.68CoO2 with different film thickness (d) and in-plane grain radius (r). With subtracting conventional voltage drop effect on Q, we derived an intrinsic rate dependence of Q. We found a scaling relation between the renormalized discharge rate (γ ≡ r2/DT; D and T are the Na+ diffusion constant and discharge time, respectively) and relative capacity (=Q/Q0; Q0 is the value at a low rate limit). The observed scaling relation is interpreted in terms of the Na+ intercalation process at the electrolyte-NaxCoO2 interface and Na+ diffusion process within NaxCoO2.

Original languageEnglish
Article number106104
JournalAPL Materials
Volume3
Issue number10
DOIs
Publication statusPublished - 2015 Oct 1
Externally publishedYes

Fingerprint

Secondary batteries
Intercalation
Electrolytes
Film thickness
Cobalt
Cathodes
Sodium
Ions
Thin films
Oxides
Voltage drop
cobalt oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Yanagita, A., Shibata, T., Kobayashi, W., & Moritomo, Y. (2015). Scaling relation between renormalized discharge rate and capacity in NaxCoO2 films. APL Materials, 3(10), [106104]. https://doi.org/10.1063/1.4933236

Scaling relation between renormalized discharge rate and capacity in NaxCoO2 films. / Yanagita, Ayumu; Shibata, Takayuki; Kobayashi, Wataru; Moritomo, Yutaka.

In: APL Materials, Vol. 3, No. 10, 106104, 01.10.2015.

Research output: Contribution to journalArticle

Yanagita, A, Shibata, T, Kobayashi, W & Moritomo, Y 2015, 'Scaling relation between renormalized discharge rate and capacity in NaxCoO2 films', APL Materials, vol. 3, no. 10, 106104. https://doi.org/10.1063/1.4933236
Yanagita, Ayumu ; Shibata, Takayuki ; Kobayashi, Wataru ; Moritomo, Yutaka. / Scaling relation between renormalized discharge rate and capacity in NaxCoO2 films. In: APL Materials. 2015 ; Vol. 3, No. 10.
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