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

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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 languageEnglish
JournalE C S Transactions
Volume69
Issue number18
Pages (from-to)71-80
Number of pages10
ISSN1938-5862
DOIs
Publication statusPublished - 2015
EventThe 228th ECS Meeting - Phoenix, Arizona, United States
Duration: 11 Oct 201515 Oct 2015
Conference number: 228
http://www.electrochem.org/meetings/biannual/228/#

Conference

ConferenceThe 228th ECS Meeting
Number228
CountryUnited States
CityPhoenix, Arizona
Period11/10/201515/10/2015
Internet address

Keywords

  • Engineering (all)

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