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Elucidating the evolution of silicon anodes in lithium based batteries

Published online by Cambridge University Press:  17 July 2020

Wenzao Li
Affiliation:
Department of Chemistry, Stony Brook University, Stony Brook, NY 11794
Mallory N. Vila
Affiliation:
Department of Chemistry, Stony Brook University, Stony Brook, NY 11794
Esther S. Takeuchi
Affiliation:
Department of Chemistry, Stony Brook University, Stony Brook, NY 11794Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794Energy and Photon Sciences Directorate, Brookhaven National Laboratory, Upton NY 11973
Kenneth J. Takeuchi
Affiliation:
Department of Chemistry, Stony Brook University, Stony Brook, NY 11794Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794
Amy C. Marschilok*
Affiliation:
Department of Chemistry, Stony Brook University, Stony Brook, NY 11794Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794Energy and Photon Sciences Directorate, Brookhaven National Laboratory, Upton NY 11973
*
*Corresponding author: amy.marschilok@stonybrook.edu
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Abstract

Silicon has attracted particular attention as a potential high capacity material for lithium based batteries. However, the application of Si-based electrodes remains challenging, in major part due to its significant irreversible energy loss during cycling. Here isothermal microcalorimetry (IMC) is demonstrated to be a precise and operando characterization method for tracking a battery's thermal behaviour and deconvoluting the contributions from electrochemical polarization, entropy change, and parasitic reactions. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and x-ray powder diffraction (XRD) further elucidate the Si reactivity in conjunction with the IMC.

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Copyright
Copyright © Materials Research Society 2020

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