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Title: Analysis of geometric and electrochemical characteristics of lithium cobalt oxide electrode with different packing densities

Abstract

In order to investigate geometric and electrochemical characteristics of Li ion battery electrode with different packing densities, lithium cobalt oxide (LiCoO 2) cathode electrodes were fabricated from a 94:3:3 (wt%) mixture of LiCoO 2, polymeric binder, and super-P carbon black and calendered to different densities. A synchrotron X-ray nano-computed tomography system with a spatial resolution of 58.2 nm at the Advanced Photon Source of the Argonne National Laboratory was employed to obtain three dimensional morphology data of the electrodes. The morphology data were then quantitatively analyzed to characterize their geometric properties, such as porosity, tortuosity, specific surface area, and pore size distribution. The geometric and electrochemical analysis reveal that high packing density electrodes have smaller average pore size and narrower pore size distribution, which improves the electrical contact between carbon-binder matrix and LiCoO 2 particles. The better contact improves the capacity and rate capability by reducing the possibility of electrically isolated LiCoO 2 particles and increasing the electrochemically active area. The results show that increase of packing density results in higher tortuosity, but electrochemically active area is more crucial to cell performance than tortuosity at up to 3.6 g/cm 3 packing density and 4 C rate.

Authors:
 [1];  [2];  [1];  [1];  [1];  [3];  [3];  [4];  [5];  [1]
  1. Indiana Univ. and Purdue Univ., Indianapolis, IN (United States). Dept. of Mechanical Engineering
  2. Indiana Univ. and Purdue Univ., Indianapolis, IN (United States). Dept. of Mechanical Engineering; Shanghai Jiao Tong Univ. (China). School of Materials Science and Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  4. Univ. of Illinois, Urbana, IL (United States). Beckman Inst.
  5. Ulsan National Inst. of Science and Technology (UNIST) (Republic of Korea). School of Energy and Chemical Engineering
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1393185
Alternate Identifier(s):
OSTI ID: 1398548
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 328; Journal Issue: C; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Calendering; Geometric characteristics; Li ion battery; Packing density; Synchrotron nano-computed tomography

Citation Formats

Lim, Cheolwoong, Yan, Bo, Kang, Huixiao, Song, Zhibin, Lee, Wen Chao, De Andrade, Vincent, De Carlo, Francesco, Yin, Leilei, Kim, Youngsik, and Zhu, Likun. Analysis of geometric and electrochemical characteristics of lithium cobalt oxide electrode with different packing densities. United States: N. p., 2016. Web. doi:10.1016/j.jpowsour.2016.07.119.
Lim, Cheolwoong, Yan, Bo, Kang, Huixiao, Song, Zhibin, Lee, Wen Chao, De Andrade, Vincent, De Carlo, Francesco, Yin, Leilei, Kim, Youngsik, & Zhu, Likun. Analysis of geometric and electrochemical characteristics of lithium cobalt oxide electrode with different packing densities. United States. doi:10.1016/j.jpowsour.2016.07.119.
Lim, Cheolwoong, Yan, Bo, Kang, Huixiao, Song, Zhibin, Lee, Wen Chao, De Andrade, Vincent, De Carlo, Francesco, Yin, Leilei, Kim, Youngsik, and Zhu, Likun. Sat . "Analysis of geometric and electrochemical characteristics of lithium cobalt oxide electrode with different packing densities". United States. doi:10.1016/j.jpowsour.2016.07.119. https://www.osti.gov/servlets/purl/1393185.
@article{osti_1393185,
title = {Analysis of geometric and electrochemical characteristics of lithium cobalt oxide electrode with different packing densities},
author = {Lim, Cheolwoong and Yan, Bo and Kang, Huixiao and Song, Zhibin and Lee, Wen Chao and De Andrade, Vincent and De Carlo, Francesco and Yin, Leilei and Kim, Youngsik and Zhu, Likun},
abstractNote = {In order to investigate geometric and electrochemical characteristics of Li ion battery electrode with different packing densities, lithium cobalt oxide (LiCoO2) cathode electrodes were fabricated from a 94:3:3 (wt%) mixture of LiCoO2, polymeric binder, and super-P carbon black and calendered to different densities. A synchrotron X-ray nano-computed tomography system with a spatial resolution of 58.2 nm at the Advanced Photon Source of the Argonne National Laboratory was employed to obtain three dimensional morphology data of the electrodes. The morphology data were then quantitatively analyzed to characterize their geometric properties, such as porosity, tortuosity, specific surface area, and pore size distribution. The geometric and electrochemical analysis reveal that high packing density electrodes have smaller average pore size and narrower pore size distribution, which improves the electrical contact between carbon-binder matrix and LiCoO2 particles. The better contact improves the capacity and rate capability by reducing the possibility of electrically isolated LiCoO2 particles and increasing the electrochemically active area. The results show that increase of packing density results in higher tortuosity, but electrochemically active area is more crucial to cell performance than tortuosity at up to 3.6 g/cm3 packing density and 4 C rate.},
doi = {10.1016/j.jpowsour.2016.07.119},
journal = {Journal of Power Sources},
number = C,
volume = 328,
place = {United States},
year = {Sat Aug 06 00:00:00 EDT 2016},
month = {Sat Aug 06 00:00:00 EDT 2016}
}

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Cited by: 7works
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