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Temperature effects on Li 4 Ti 5 O 12 electrode/electrolyte interfaces at the first cycle: A X-ray Photoelectron Spectroscopy and Scanning Auger Microscopy study

Abstract : Li4Ti5O12-based negative electrodes for Lithium-ion batteries are of interest because of the high reversibility of Li+ insertion/extraction. In this study, the surface of cycled electrodes is analysed by X-ray Photoelectron Spectroscopy (XPS) and Scanning Auger Microscopy (SAM) to investigate the effects of cycling temperature (room temperature, 60 °C and 85 °C) upon the solid electrolyte interphase (SEI) formation, which plays a major role in batteries electrochemical performances. Half-cells, with a vinylene carbonate containing electrolyte, are galvanostatically cycled at different steps of the first cycle: the mid-plateau during the first discharge, the end of the first discharge at 1.2 V and the end of the first charge at 2.0 V. XPS analysis evidences that higher temperatures promote the formation of a thicker SEI, which can explain the increase of the irreversible capacity with temperature. SAM mappings (allowing high spatial resolution ∼10–100 nm) evidence that this SEI homogeneously covers the electrode surface, regardless of the cycling temperature. During charge, the SEI is partially dissolved at room temperature, more slightly at 60 °C whereas at 85 °C, no clear evidence of layer thinning is observed. The SEI chemical composition is also investigated and reveals a majority of organic species and an increasing proportion of LiF with the temperature.
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https://hal.archives-ouvertes.fr/hal-01622408
Contributor : Cécile Courreges <>
Submitted on : Tuesday, October 24, 2017 - 1:36:32 PM
Last modification on : Friday, April 9, 2021 - 10:28:04 AM

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Jean-Baptiste Gieu, Cecile Courreges, L. El Ouatani, C. Tessier, Hervé Martinez. Temperature effects on Li 4 Ti 5 O 12 electrode/electrolyte interfaces at the first cycle: A X-ray Photoelectron Spectroscopy and Scanning Auger Microscopy study. Journal of Power Sources, Elsevier, 2016, 318, pp.291 - 301. ⟨10.1016/j.jpowsour.2016.04.007⟩. ⟨hal-01622408⟩

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