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Title: Three-Phase 3D Reconstruction of a LiCoO2 Cathode via FIB-SEM Tomography

Abstract

Abstract Three-phase three-dimensional (3D) microstructural reconstructions of lithium-ion battery electrodes are critical input for 3D simulations of electrode lithiation/delithiation, which provide a detailed understanding of battery operation. In this report, 3D images of a LiCoO 2electrode are achieved using focused ion beam-scanning electron microscopy (FIB-SEM), with clear contrast among the three phases: LiCoO 2particles, carbonaceous phases (carbon and binder) and the electrolyte space. The good contrast was achieved by utilizing an improved FIB-SEM sample preparation method that combined infiltration of the electrolyte space with a low-viscosity silicone resin and triple ion-beam polishing. Morphological parameters quantified include phase volume fraction, surface area, feature size distribution, connectivity, and tortuosity. Electrolyte tortuosity was determined using two different geometric calculations that were in good agreement. The electrolyte tortuosity distribution versus position within the electrode was found to be highly inhomogeneous; this will lead to inhomogeneous electrode lithiation/delithiation at high C-rates that could potentially cause battery degradation.

Authors:
ORCiD logo; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1354598
Report Number(s):
BNL-113115-2016-JA
Journal ID: ISSN 1431-9276
DOE Contract Number:  
SC00112704
Resource Type:
Journal Article
Resource Relation:
Journal Name: Microscopy and Microanalysis; Journal Volume: 22; Journal Issue: 01
Country of Publication:
United States
Language:
English

Citation Formats

Liu, Zhao, Chen-Wiegart, Yu-chen K., Wang, Jun, Barnett, Scott A., and Faber, Katherine T. Three-Phase 3D Reconstruction of a LiCoO2 Cathode via FIB-SEM Tomography. United States: N. p., 2016. Web. doi:10.1017/S1431927615015640.
Liu, Zhao, Chen-Wiegart, Yu-chen K., Wang, Jun, Barnett, Scott A., & Faber, Katherine T. Three-Phase 3D Reconstruction of a LiCoO2 Cathode via FIB-SEM Tomography. United States. doi:10.1017/S1431927615015640.
Liu, Zhao, Chen-Wiegart, Yu-chen K., Wang, Jun, Barnett, Scott A., and Faber, Katherine T. Thu . "Three-Phase 3D Reconstruction of a LiCoO2 Cathode via FIB-SEM Tomography". United States. doi:10.1017/S1431927615015640.
@article{osti_1354598,
title = {Three-Phase 3D Reconstruction of a LiCoO2 Cathode via FIB-SEM Tomography},
author = {Liu, Zhao and Chen-Wiegart, Yu-chen K. and Wang, Jun and Barnett, Scott A. and Faber, Katherine T.},
abstractNote = {Abstract Three-phase three-dimensional (3D) microstructural reconstructions of lithium-ion battery electrodes are critical input for 3D simulations of electrode lithiation/delithiation, which provide a detailed understanding of battery operation. In this report, 3D images of a LiCoO2electrode are achieved using focused ion beam-scanning electron microscopy (FIB-SEM), with clear contrast among the three phases: LiCoO2particles, carbonaceous phases (carbon and binder) and the electrolyte space. The good contrast was achieved by utilizing an improved FIB-SEM sample preparation method that combined infiltration of the electrolyte space with a low-viscosity silicone resin and triple ion-beam polishing. Morphological parameters quantified include phase volume fraction, surface area, feature size distribution, connectivity, and tortuosity. Electrolyte tortuosity was determined using two different geometric calculations that were in good agreement. The electrolyte tortuosity distribution versus position within the electrode was found to be highly inhomogeneous; this will lead to inhomogeneous electrode lithiation/delithiation at high C-rates that could potentially cause battery degradation.},
doi = {10.1017/S1431927615015640},
journal = {Microscopy and Microanalysis},
number = 01,
volume = 22,
place = {United States},
year = {Thu Jan 14 00:00:00 EST 2016},
month = {Thu Jan 14 00:00:00 EST 2016}
}