Daemi, SR;
Tan, C;
Volkenandt, T;
Cooper, SJ;
Palacios-Padros, A;
Cookson, J;
Brett, DJL;
(2018)
Visualizing the Carbon Binder Phase of Battery Electrodes in Three Dimensions.
ACS Applied Energy Materials
, 1
(8)
pp. 3702-3710.
10.1021/acsaem.8b00501.
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Abstract
This study presents a technique to directly characterize the carbon and binder domain (CBD) in lithium-ion (Li-ion) battery electrodes in three dimensions and use it to determine the effective transport properties of a LiNi₀.₃₃Mn₀.₃₃Co₀.₃₃O₂ (NMC) electrode. X-ray nanocomputed tomography (nano-CT) is used to image an electrode composed solely of carbon and binder, whereas focused ion beam–scanning electron microscopy is used to analyze cross-sections of a NMC electrode to gain morphological information regarding the electrode and CBD porosity. Combining the information gathered from these techniques reduces the uncertainty inherent in segmenting the nano-CT CBD data set and enables effective diffusivity of its porous network to be determined. X-ray microcomputed tomography (micro-CT) is then used to collect a NMC data set that is subsequently segmented into three phases, comprised of active material, pore, and CBD. The effective diffusivity calculated for the nano-CT data set is incorporated for the CBD present in the micro-CT data set to estimate the ensemble tortuosity factor for the NMC electrode. The tortuosity factor greatly increases when compared to the same data set segmented without considering the CBD. The porous network of the NMC electrode is studied with a continuous pore size distribution approach that highlights median radii of 180 nm and 1 μm for the CBD and NMC pores, respectively, and with a pore throat size distribution calculation that highlights median equivalent radii of 350 and 700 nm.
| Type: | Article |
|---|---|
| Title: | Visualizing the Carbon Binder Phase of Battery Electrodes in Three Dimensions |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsaem.8b00501 |
| Publisher version: | http://dx.doi.org/10.1021/acsaem.8b00501 |
| Language: | English |
| Additional information: | © 2018 American Chemical Society. ACS AuthorChoice - This is an open access article published under a Creative Commons Attribution (CC-BY) License (https://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Li-ion batteries, lab-based X-ray computed tomography, carbon binder characterization, porous materials, multiscale image-based modeling |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10058427 |
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