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Influence of Laser Structuring and Calendering of Graphite Anodes on Electrode Properties and Cell Performance.

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Title: Influence of Laser Structuring and Calendering of Graphite Anodes on Electrode Properties and Cell Performance.
Authors: Hille, Lucas1,2 lucas.hille@iwb.tum.de, Toepper, Hans-Christoph1,2, Schriever, Charlotte1,2, Kriegler, Johannes1,2, Keilhofer, Josef1,2, Noecker, Marc P.1,2, Zaeh, Michael F.1,2
Source: Journal of The Electrochemical Society. Jun2022, Vol. 169 Issue 6, p1-11. 11p.
Subjects: Pore size distribution, Anodes, Electrode performance, Electrochemical electrodes, Electrode potential, Electrodes, Scanning electrochemical microscopy
Abstract: In this study, the influence of calendering and laser structuring on the pore structure and electrochemical performance of electrodes is reported. Graphite anodes of varying bulk porosity were micro structured with pulsed laser radiation. Using scanning electron microscopy and energy-dispersive X-ray spectroscopy, laser structuring was found to release superficial pore clogging caused by calendering and to result in binder agglomerates on the electrode surfaces. Structured electrodes showed higher porosities than their unstructured counterparts due to a thickness increase and material removal, but no significant change in the pore size distribution was detected using mercury intrusion porosimetry. Electrochemical impedance spectra of symmetric battery cells revealed increasing ionic resistances and tortuosities for decreasing electrode porosities. Laser structuring significantly reduced the underlying lithium-ion diffusion limitations at all porosity levels. In a discharge rate test, performance deteriorations at high currents were found to be amplified by calendering and could be diminished by electrode structuring. The performance improvements by laser structuring moved towards lower C-rates for stronger compressed anodes. Despite their growth in thickness and porosity, laser structured graphite anodes showed a higher volumetric energy density at high currents than unstructured electrodes, which demonstrates the potential of electrode structuring for highly compressed anodes. [ABSTRACT FROM AUTHOR]
Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Influence of Laser Structuring and Calendering of Graphite Anodes on Electrode Properties and Cell Performance.
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  Data: <searchLink fieldCode="AR" term="%22Hille%2C+Lucas%22">Hille, Lucas</searchLink><relatesTo>1,2</relatesTo><i> lucas.hille@iwb.tum.de</i><br /><searchLink fieldCode="AR" term="%22Toepper%2C+Hans-Christoph%22">Toepper, Hans-Christoph</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Schriever%2C+Charlotte%22">Schriever, Charlotte</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Kriegler%2C+Johannes%22">Kriegler, Johannes</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Keilhofer%2C+Josef%22">Keilhofer, Josef</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Noecker%2C+Marc+P%2E%22">Noecker, Marc P.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Zaeh%2C+Michael+F%2E%22">Zaeh, Michael F.</searchLink><relatesTo>1,2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+The+Electrochemical+Society%22">Journal of The Electrochemical Society</searchLink>. Jun2022, Vol. 169 Issue 6, p1-11. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Pore+size+distribution%22">Pore size distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Anodes%22">Anodes</searchLink><br /><searchLink fieldCode="DE" term="%22Electrode+performance%22">Electrode performance</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemical+electrodes%22">Electrochemical electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Electrode+potential%22">Electrode potential</searchLink><br /><searchLink fieldCode="DE" term="%22Electrodes%22">Electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+electrochemical+microscopy%22">Scanning electrochemical microscopy</searchLink>
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  Label: Abstract
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  Data: In this study, the influence of calendering and laser structuring on the pore structure and electrochemical performance of electrodes is reported. Graphite anodes of varying bulk porosity were micro structured with pulsed laser radiation. Using scanning electron microscopy and energy-dispersive X-ray spectroscopy, laser structuring was found to release superficial pore clogging caused by calendering and to result in binder agglomerates on the electrode surfaces. Structured electrodes showed higher porosities than their unstructured counterparts due to a thickness increase and material removal, but no significant change in the pore size distribution was detected using mercury intrusion porosimetry. Electrochemical impedance spectra of symmetric battery cells revealed increasing ionic resistances and tortuosities for decreasing electrode porosities. Laser structuring significantly reduced the underlying lithium-ion diffusion limitations at all porosity levels. In a discharge rate test, performance deteriorations at high currents were found to be amplified by calendering and could be diminished by electrode structuring. The performance improvements by laser structuring moved towards lower C-rates for stronger compressed anodes. Despite their growth in thickness and porosity, laser structured graphite anodes showed a higher volumetric energy density at high currents than unstructured electrodes, which demonstrates the potential of electrode structuring for highly compressed anodes. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1149/1945-7111/ac725c
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 1
    Subjects:
      – SubjectFull: Pore size distribution
        Type: general
      – SubjectFull: Anodes
        Type: general
      – SubjectFull: Electrode performance
        Type: general
      – SubjectFull: Electrochemical electrodes
        Type: general
      – SubjectFull: Electrode potential
        Type: general
      – SubjectFull: Electrodes
        Type: general
      – SubjectFull: Scanning electrochemical microscopy
        Type: general
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      – TitleFull: Influence of Laser Structuring and Calendering of Graphite Anodes on Electrode Properties and Cell Performance.
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            NameFull: Hille, Lucas
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            NameFull: Toepper, Hans-Christoph
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            NameFull: Schriever, Charlotte
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            – D: 01
              M: 06
              Text: Jun2022
              Type: published
              Y: 2022
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