Three-Phase 3D Reconstruction of a LiCoO2 Cathode via FIB-SEM Tomography
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.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- SC00112704
- OSTI ID:
- 1354598
- Report Number(s):
- BNL-113115-2016-JA
- Journal Information:
- Microscopy and Microanalysis, Vol. 22, Issue 01; ISSN 1431-9276
- Publisher:
- Microscopy Society of America (MSA)
- Country of Publication:
- United States
- Language:
- English
Reconstruction–Simulation Approach Verifies Impedance-Derived Ion Transport Tortuosity of a Graphite Battery Electrode
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journal | January 2018 |
Computational modeling of Li-ion batteries
|
journal | August 2016 |
FIB-SEM Three-Dimensional Tomography for Characterization of Carbon-Based Materials
|
journal | July 2019 |
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