Cell-Format-Dependent Mechanical Damage in Silicon Anodes

Rodrigues, Marco-Tulio F.; Rajendran, Sathish; Trask, Stephen E.; Dunlop, Alison R.; Singh, Avtar; Allen, Jeffery M.; Weddle, Peter J.; Preimesberger, Juliane I.; Coyle, Jaclyn; Colclasure, Andrew M.; Yang, Zhenzhen; Ingram, Brian J.; Jansen, Andrew N.

doi:10.1021/acsaem.3c01531

DOE OSTI · 1999665

Cell-Format-Dependent Mechanical Damage in Silicon Anodes

Rodrigues, Marco-Tulio F.·Rajendran, Sathish·Trask, Stephen E.·Dunlop, Alison R.·Singh, Avtar·Allen, Jeffery M.·Weddle, Peter J.·Preimesberger, Juliane I.·Coyle, Jaclyn·Colclasure, Andrew M.·Yang, Zhenzhen·Ingram, Brian J.·Jansen, Andrew N.

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Abstract

Strong binders can be counterproductive for silicon anodes. Here, we show that stresses from cycling Si-based electrodes can cause permanent stretching and wrinkling of the current collector. Furthermore, this deformation damages the electrode coating and accelerates cell aging due to the inactivation of Si domains and facilitation of Li plating. Interestingly, we demonstrate that the formation of wrinkles is size-dependent, being present in pouch cells but absent from coin cells. This size-dependent performance decay indicates that, in extreme cases, testing outcomes are highly dependent on scale and that the validation of battery materials may require testing at larger cell formats.

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25 ENERGY STORAGE 30 DIRECT ENERGY CONVERSION Li plating SiOx binder mechanical properties polyimide silicon anode wrinkling

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Rodrigues, Marco-Tulio F., Rajendran, Sathish, Trask, Stephen E., Dunlop, Alison R., Singh, Avtar, Allen, Jeffery M., Weddle, Peter J., Preimesberger, Juliane I., Coyle, Jaclyn, Colclasure, Andrew M., Yang, Zhenzhen, Ingram, Brian J., Jansen, Andrew N.. 2023-09-06. Cell-Format-Dependent Mechanical Damage in Silicon Anodes. https://doi.org/10.1021/acsaem.3c01531

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