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Effect of electrolyte components, salt concentration, and electrolyte additive, on electrolyte distribution over a charging LiMO2 electrode

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A Correction to this article was published on 23 May 2022

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Abstract

This paper discusses the electrolyte distribution over the surface of a 4.5 V LiCoO2 electrode via linear sweep voltammetry using the Pt probe of a scanning electrochemical microscope. On a typical electrolyte composition for Li-ion batteries (LIBs), 1.0 M LiPF6 EC/DEC (3/7, vol. %), the reduction peak of non-solvated free-ethylene carbonate (EC) increased, and the peak of diethyl carbonate (DEC) decreased as the Pt probe approaching the oxidizing LiCoO2 substrate. When the salt concentration increased, the reduction current by the free-EC decreased as the Pt probe approaching the substrate. By adding 1,3,5-trifluorobenzene as an electrolyte additive, the separation of these two reduction peaks became unclear, and the variation of the peak current almost disappeared closer to the oxidizing electrode. Compared to their electrochemical performance for LIBs, the electrolyte distribution measured by the Pt probe over the electrode surface has a relationship with electrolyte decomposition at the 1st charging process, charge transfer resistance (Rct) at the electrode interface, electrolyte impregnation into the coated electrode, and electrochemical performances of LIBs.

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Funding

This work was supported by the 2021 Research Fund of the University of Seoul.

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  1. Department of Chemical Engineering, University of Seoul, 163 Shiripdae-ro, Dongdaemun-gu, Seoul, 02504, Republic of Korea

    Cheolsoo Jung

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  1. Cheolsoo Jung
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Correspondence to Cheolsoo Jung.

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Jung, C. Effect of electrolyte components, salt concentration, and electrolyte additive, on electrolyte distribution over a charging LiMO2 electrode. J Solid State Electrochem 26, 1469–1475 (2022). https://doi.org/10.1007/s10008-022-05178-y

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  • DOI: https://doi.org/10.1007/s10008-022-05178-y

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