Integral Role of the NiS Electrode/Electrolyte Interface in the Redox Reaction with Lithium

Abstract

Electrochemically synthesized thin-layer NiS electrodes were studied in lithium perchlorate dissolved in 1.3-dioxolane or in a mixture of 1.3-dioxolane and tetrahydrofuran. In the 1.3-dioxolane 1 M LiClO4 electrolyte, the irreversible capacity was reduced by 20% сompared to the initial capacity. However, the stability of the electrochemical characteristics of NiS electrodes in redox reactions with lithium is unsatisfactory. Much better results of charge–discharge cycling of NiS electrodes were obtained in the electrolyte solutions of 1.3-dioxolane, tetrahydrofuran, and 1 M LiClO4 demonstrating a stable reversible capacity of 400–450 mAh/g during 50–75 cycles. Using the methods of electron microscopy and IR spectroscopy with Fourier transform, it was established that the reason for the discharge capacity fading of NiS electrodes was associated with the formation of a surface film, which reduces the adhesion and cohesion of NiS particles. This, in turn, leads to a loss in the mechanical strength of NiS electrodes.

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ACKNOWLEDGMENTS

We are grateful to P.M. Litvin for the analyses performed with AFM.

Funding

The work was carried out in the context of cooperation between Ukrainian and Israeli research workers under the guidance of professors D. Aurbach and E. Shembel’.

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Correspondence to R. D. Apostolova.

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The authors declare that they have no conflict of interest.

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Translated by M. Myshkina

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Apostolova, R.D., Shembel’, E.M., Markovsky, B. et al. Integral Role of the NiS Electrode/Electrolyte Interface in the Redox Reaction with Lithium. Surf. Engin. Appl.Electrochem. 56, 665–674 (2020). https://doi.org/10.3103/S1068375520060034

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Keywords:

  • lithium battery
  • NiS electrode
  • electrochemical characteristics
  • dioxolane/LiClO4
  • dioxolane
  • tetrahydrofuran/LiClO4
  • surface film