NANOSCALE THERMAL TRANSPORT AND ELASTIC PROPERTIES OF LITHIATED AMORPHOUS SI THIN FILMS

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dc.contributor.authorAbdullaev, Azat
dc.contributor.authorMukanova, Aliya
dc.contributor.authorYakupov, Talgat A.
dc.contributor.authorMentbayeva, Almagul
dc.contributor.authorBakenov, Zhumabay
dc.contributor.authorUtegulov, Zhandos N.
dc.date.accessioned2021-09-07T07:35:37Z
dc.date.available2021-09-07T07:35:37Z
dc.date.issued2020-01-16
dc.description.abstractSilicon is the heart of modern electronics and due to it is high theoretical storage capacity it also attracted much attention as a possible anode material for the next generation Li-ion batteries. Heat conduction is one of the major properties in the development of Li-ion batteries for energy conversion systems and it is of paramount importance to have comprehensive understanding of heat dissipation on the scale of electrochemical storage device. In this work we report ex-situ study of nanoscale thermal transport and elastic properties of lithiated amorphous Si (a-Si) anode films using picosecond time-domain thermoreflectance (TDTR). Radio frequency (rf) magnetron sputtering was used to deposit a ∼330 nm thick a-Si films on glass substrate. Near-surface nanoscale thermal transport measurements show 40% increase in thermal conductivity of a-Si upon electrochemical lithiation reaching up to 2.2 W m-1K−1. This sizeable increase might be due to Li+ ion-mediated heat conduction during lithiation process. The standard deviation of measured thermal conductivity was slightly higher likely due to inhomogeneous lateral and cross-plane Li+ ions distribution in the sub-surface film region. Nanosecond laser pulsed induced surface acoustic waves (SAWs) measurements showed the decrease in Young’s modulus after lithiation on nanometre scale, which is attributed to volumetric expansion of Si upon Li+ ions insertionen_US
dc.identifier.citationAbdullaev, A., Mukanova, A., Yakupov, T., Mentbayeva, A., Bakenov, Z., & Utegulov, Z. (2020). Nanoscale thermal transport and elastic properties of lithiated amorphous Si thin films. Materials Today: Proceedings, 25, 88–92. https://doi.org/10.1016/j.matpr.2019.11.333en_US
dc.identifier.urihttp://nur.nu.edu.kz/handle/123456789/5741
dc.language.isoenen_US
dc.publisherMaterials Today: Proceedingsen_US
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectType of access: Open Accessen_US
dc.subjectAmorphous siliconen_US
dc.subjectThin filmen_US
dc.subjectLithium-ion batteriesen_US
dc.subjectThermal transporten_US
dc.subjectElastic propertiesen_US
dc.subjectLithiationen_US
dc.titleNANOSCALE THERMAL TRANSPORT AND ELASTIC PROPERTIES OF LITHIATED AMORPHOUS SI THIN FILMSen_US
dc.typeArticleen_US
workflow.import.sourcescience

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