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Low‐Temperature Charging and Aging Mechanisms of Si/C Composite Anodes in Li‐Ion Batteries: An Operando Neutron Scattering Study

The addition of Si compounds to graphite anodes has become an attractive way of increasing the practical specific energies in Li‐ion cells. Previous studies involving Si/C anodes lacked direct insight into the processes occurring in full cells during low‐temperature operation. In this study, a power...

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Autores principales: Richter, Karsten, Waldmann, Thomas, Paul, Neelima, Jobst, Nicola, Scurtu, Rares‐George, Hofmann, Michael, Gilles, Ralph, Wohlfahrt‐Mehrens, Margret
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7028078/
https://www.ncbi.nlm.nih.gov/pubmed/31738480
http://dx.doi.org/10.1002/cssc.201903139
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author Richter, Karsten
Waldmann, Thomas
Paul, Neelima
Jobst, Nicola
Scurtu, Rares‐George
Hofmann, Michael
Gilles, Ralph
Wohlfahrt‐Mehrens, Margret
author_facet Richter, Karsten
Waldmann, Thomas
Paul, Neelima
Jobst, Nicola
Scurtu, Rares‐George
Hofmann, Michael
Gilles, Ralph
Wohlfahrt‐Mehrens, Margret
author_sort Richter, Karsten
collection PubMed
description The addition of Si compounds to graphite anodes has become an attractive way of increasing the practical specific energies in Li‐ion cells. Previous studies involving Si/C anodes lacked direct insight into the processes occurring in full cells during low‐temperature operation. In this study, a powerful combination of operando neutron diffraction, electrochemical tests, and post‐mortem analysis is used for the investigation of Li‐ion cells. 18650‐type cylindrical cells in two different aging states are investigated by operando neutron diffraction. The experiments reveal deep insights and important trends in low‐temperature charging mechanisms involving intercalation, alloying, Li metal deposition, and relaxation processes as a function of charging C‐rates and temperatures. Additionally, the main aging mechanism caused by long‐term cycling and interesting synergistic effects of Si and graphite are elucidated.
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spelling pubmed-70280782020-02-25 Low‐Temperature Charging and Aging Mechanisms of Si/C Composite Anodes in Li‐Ion Batteries: An Operando Neutron Scattering Study Richter, Karsten Waldmann, Thomas Paul, Neelima Jobst, Nicola Scurtu, Rares‐George Hofmann, Michael Gilles, Ralph Wohlfahrt‐Mehrens, Margret ChemSusChem Full Papers The addition of Si compounds to graphite anodes has become an attractive way of increasing the practical specific energies in Li‐ion cells. Previous studies involving Si/C anodes lacked direct insight into the processes occurring in full cells during low‐temperature operation. In this study, a powerful combination of operando neutron diffraction, electrochemical tests, and post‐mortem analysis is used for the investigation of Li‐ion cells. 18650‐type cylindrical cells in two different aging states are investigated by operando neutron diffraction. The experiments reveal deep insights and important trends in low‐temperature charging mechanisms involving intercalation, alloying, Li metal deposition, and relaxation processes as a function of charging C‐rates and temperatures. Additionally, the main aging mechanism caused by long‐term cycling and interesting synergistic effects of Si and graphite are elucidated. John Wiley and Sons Inc. 2019-12-27 2020-02-07 /pmc/articles/PMC7028078/ /pubmed/31738480 http://dx.doi.org/10.1002/cssc.201903139 Text en © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Papers
Richter, Karsten
Waldmann, Thomas
Paul, Neelima
Jobst, Nicola
Scurtu, Rares‐George
Hofmann, Michael
Gilles, Ralph
Wohlfahrt‐Mehrens, Margret
Low‐Temperature Charging and Aging Mechanisms of Si/C Composite Anodes in Li‐Ion Batteries: An Operando Neutron Scattering Study
title Low‐Temperature Charging and Aging Mechanisms of Si/C Composite Anodes in Li‐Ion Batteries: An Operando Neutron Scattering Study
title_full Low‐Temperature Charging and Aging Mechanisms of Si/C Composite Anodes in Li‐Ion Batteries: An Operando Neutron Scattering Study
title_fullStr Low‐Temperature Charging and Aging Mechanisms of Si/C Composite Anodes in Li‐Ion Batteries: An Operando Neutron Scattering Study
title_full_unstemmed Low‐Temperature Charging and Aging Mechanisms of Si/C Composite Anodes in Li‐Ion Batteries: An Operando Neutron Scattering Study
title_short Low‐Temperature Charging and Aging Mechanisms of Si/C Composite Anodes in Li‐Ion Batteries: An Operando Neutron Scattering Study
title_sort low‐temperature charging and aging mechanisms of si/c composite anodes in li‐ion batteries: an operando neutron scattering study
topic Full Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7028078/
https://www.ncbi.nlm.nih.gov/pubmed/31738480
http://dx.doi.org/10.1002/cssc.201903139
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