Low-voltage FIB/SEM Tomography for 3D Microstructure Evolution of LiFePO4/C Electrode

Roberto Scipioni; Peter Stanley Jørgensen; Duc-The Ngo; Søren Bredmose Simonsen; Johan Hjelm; Poul Norby; Søren Højgaard Jensen

doi:10.1149/06918.0071ecst

Low-voltage FIB/SEM Tomography for 3D Microstructure Evolution of LiFePO₄/C Electrode

Roberto Scipioni, Peter Stanley Jørgensen, Duc-The Ngo, Søren Bredmose Simonsen, Johan Hjelm, Poul Norby, Søren Højgaard Jensen

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Abstract

This work presents an investigation of the degradation mechanisms that occur in LiFePO4/C battery electrodes during charge/discharge cycling. Impedance spectra were measured on a fresh electrode and an electrode aged by cycling. The spectra were modeled with an equivalent circuit which indicates that both the ionic and electronic pathways in the electrode were negatively affected by the cycling. Focused Ion Beam/Scanning Electron Microscopy (FIB/SEM) tomography of both electrodes shows that cycling causes agglomerations of Carbon black (CB). In addition to this, Low-voltage FIB/SEM revealed non-conductive CB in the aged electrode.

Original language	English
Journal	E C S Transactions
Volume	69
Issue number	18
Pages (from-to)	71-80
Number of pages	10
ISSN	1938-5862
DOIs	https://doi.org/10.1149/06918.0071ecst
Publication status	Published - 2015
Event	The 228th ECS Meeting - Phoenix, Arizona, United States Duration: 11 Oct 2015 → 15 Oct 2015 Conference number: 228 http://www.electrochem.org/meetings/biannual/228/#

Conference

Conference	The 228th ECS Meeting
Number	228
Country/Territory	United States
City	Phoenix, Arizona
Period	11/10/2015 → 15/10/2015
Internet address	http://www.electrochem.org/meetings/biannual/228/#

Keywords

Engineering (all)

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10.1149/06918.0071ecst

Paper 58497 manuscript 17142 0Accepted author manuscript, 1.12 MB

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Cite this

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title = "Low-voltage FIB/SEM Tomography for 3D Microstructure Evolution of LiFePO4/C Electrode",

abstract = "This work presents an investigation of the degradation mechanisms that occur in LiFePO4/C battery electrodes during charge/discharge cycling. Impedance spectra were measured on a fresh electrode and an electrode aged by cycling. The spectra were modeled with an equivalent circuit which indicates that both the ionic and electronic pathways in the electrode were negatively affected by the cycling. Focused Ion Beam/Scanning Electron Microscopy (FIB/SEM) tomography of both electrodes shows that cycling causes agglomerations of Carbon black (CB). In addition to this, Low-voltage FIB/SEM revealed non-conductive CB in the aged electrode.",

keywords = "Engineering (all)",

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AU - Scipioni, Roberto

AU - Jørgensen, Peter Stanley

AU - Ngo, Duc-The

AU - Simonsen, Søren Bredmose

AU - Hjelm, Johan

AU - Norby, Poul

AU - Jensen, Søren Højgaard

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AB - This work presents an investigation of the degradation mechanisms that occur in LiFePO4/C battery electrodes during charge/discharge cycling. Impedance spectra were measured on a fresh electrode and an electrode aged by cycling. The spectra were modeled with an equivalent circuit which indicates that both the ionic and electronic pathways in the electrode were negatively affected by the cycling. Focused Ion Beam/Scanning Electron Microscopy (FIB/SEM) tomography of both electrodes shows that cycling causes agglomerations of Carbon black (CB). In addition to this, Low-voltage FIB/SEM revealed non-conductive CB in the aged electrode.

KW - Engineering (all)

U2 - 10.1149/06918.0071ecst

DO - 10.1149/06918.0071ecst

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