Correction: Local structure of a highly concentrated NaClO₄ aqueous solution-type electrolyte for sodium ion batteries

Abstract

Correction for ‘Local structure of a highly concentrated NaClO₄ aqueous solution-type electrolyte for sodium ion batteries’ by Ryo Sakamoto et al., Phys. Chem. Chem. Phys., 2020, 22, 26452–26458, DOI: 10.1039/D0CP04376A.

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The authors apologise that the Walden plot of NaClO₄ aq. solution shown in Fig. 1 and the viscosity and electrical conductivity plot shown in Fig. S1 were incorrect because the concentration used in the calculation was incorrect. The figures are corrected as follows:

Fig. 1 Walden plot of NaClO₄ aq. electrolyte.

Fig. S1 Viscosity and electrical conductivity of the NaClO₄ aq. electrolytes at various concentrations.

The corrections shown here do not affect the conclusions in the paper. But, the discussion about Fig. 1 and Fig. S1 on page 26454 should read as follows:

Fig. S1 (ESI†) summarizes the viscosity and the ionic conductivity at each NaClO₄ concentration. The viscosity was higher with increasing NaClO₄ salt concentration, but the ionic conductivity showed a maximum value at 7 m NaClO₄ aq. solution. The 17 m NaClO₄ aq. solution had a viscosity of 7.8 mPa s and an ionic conductivity of 108 mS cm⁻¹. The viscosity of the NaClO₄ aq. electrolyte was comparable to that of the non-aqueous electrolyte (6.8 mPa s, 1 M NaClO₄ in PC), but the ionic conductivity was much higher than that of the non-aqueous electrolyte (6.5 mS cm⁻¹).¹ These results suggested that the ionic conductivity of the NaClO₄ aq. electrolyte was not impaired even at a high salt concentration. Fig. 1 shows the Walden plot of the NaClO₄ aq. solution, and that of KCl aq. solution as an ideal solution. Here, Walden's rule is “Λ × η = const.” (Λ: molar conductivity; η: viscosity). For 1 m NaClO₄ aq. solution, it was close to the straight line of the KCl aq. solution, and it was again close to the straight line of KCl aq. solution at 17 m NaClO₄ aq. solution. Although NaClO₄ was completely dissociated in 1 m NaClO₄ aq. solution, ion pairs between the Na⁺ ions and ClO₄⁻ ions were formed in concentrated NaClO₄ aq. solution, as shown by the Raman and EPSR results described later. Nevertheless, no significant decrease in ionic conductivity was observed in the concentrated region, suggesting the specific ion-transport mechanism, such as ion hopping mechanism, between vicinal Na⁺ ions in the orderly solution structure over a long range. Similar behavior was also reported in concentrated LiTFSA aq. solution² and LiFSA in dinitrile electrolytes.³

The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

References

1. A. Ponrouch, E. Marchante, M. Courty, J. M. Tarascon and M. R. Palacín, Energy Environ. Sci., 2012, 5, 8572.
2. T. Tsurumura, Y. Hashimoto, M. Morita, Y. Umebayashi and K. Fujii, Anal. Sci., 2019, 35, 289–294.
3. Y. Ugata, M. L. Thomas, T. Mandai, K. Ueno, K. Dokko and M. Watanabe, Phys. Chem. Chem. Phys., 2019, 21, 9759.

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