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Title: Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi 0.8Co 0.15Al 0.05O 2 (NCA)

Abstract

The prevailing electrode fabrication method for lithium-ion battery electrodes includes calendering at high pressures to densify the electrode and promote adhesion to the metal current collector. However, this process increases the tortuosity of the pore network in the primary transport direction and imposes severe tradeoffs between electrode thickness and rate capability. With the aim of understanding the impact of pore tortuosity on electrode kinetics, and enabling cell designs with thicker electrodes and improved cost and energy density, we use here freeze-casting, a shaping technique able to produce low-tortuosity structures using ice crystals as a pore-forming agent, to fabricate LiNi 0.8Co 0.15Al 0.05O 2 (NCA) cathodes with controlled, aligned porosity. Electrode tortuosity is characterized using two complementary methods, X-ray tomography combined with thermal diffusion simulations, and electrochemical transport measurements. The results allow comparison across a wide range of microstructures, and highlight the large impact of a relatively small numerical change in tortuosity on electrode kinetics. Under galvanostatic discharge, optimized microstructures show a three- to fourfold increase in area-specific capacity compared to typical Li-ion composite electrodes. Hybrid pulse power characterization (HPPC) demonstrates improved power capability, while dynamic stress tests (DST) shows that an area-specific area capacity corresponding to 91% of the NCAmore » galvanostatic C/10 capacity could be reached.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering; Univ. of Mons (Belgium). Lab. of Physics of Surfaces and Interfaces
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Qatar Foundation, Doha (Qatar). Qatar Environment and Energy Research Inst.
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering
  4. Univ. of Mons (Belgium). Lab. of Physics of Surfaces and Interfaces
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Mons (Belgium)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Belgian Science Policy Office; Région Wallone (Belgium); Wallonie-Bruxelles International (Belgium); National Fund for Scientific Research (FNRS) (Belgium)
OSTI Identifier:
1419826
Alternate Identifier(s):
OSTI ID: 1494080
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 2; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; freeze-casting; lithium-ion; tortuosity

Citation Formats

Delattre, Benjamin, Amin, Ruhul, Sander, Jonathan, De Coninck, Joël, Tomsia, Antoni P., and Chiang, Yet-Ming. Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi0.8Co0.15Al0.05O2 (NCA). United States: N. p., 2018. Web. doi:10.1149/2.1321802jes.
Delattre, Benjamin, Amin, Ruhul, Sander, Jonathan, De Coninck, Joël, Tomsia, Antoni P., & Chiang, Yet-Ming. Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi0.8Co0.15Al0.05O2 (NCA). United States. doi:10.1149/2.1321802jes.
Delattre, Benjamin, Amin, Ruhul, Sander, Jonathan, De Coninck, Joël, Tomsia, Antoni P., and Chiang, Yet-Ming. Fri . "Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi0.8Co0.15Al0.05O2 (NCA)". United States. doi:10.1149/2.1321802jes.
@article{osti_1419826,
title = {Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi0.8Co0.15Al0.05O2 (NCA)},
author = {Delattre, Benjamin and Amin, Ruhul and Sander, Jonathan and De Coninck, Joël and Tomsia, Antoni P. and Chiang, Yet-Ming},
abstractNote = {The prevailing electrode fabrication method for lithium-ion battery electrodes includes calendering at high pressures to densify the electrode and promote adhesion to the metal current collector. However, this process increases the tortuosity of the pore network in the primary transport direction and imposes severe tradeoffs between electrode thickness and rate capability. With the aim of understanding the impact of pore tortuosity on electrode kinetics, and enabling cell designs with thicker electrodes and improved cost and energy density, we use here freeze-casting, a shaping technique able to produce low-tortuosity structures using ice crystals as a pore-forming agent, to fabricate LiNi0.8Co0.15Al0.05O2 (NCA) cathodes with controlled, aligned porosity. Electrode tortuosity is characterized using two complementary methods, X-ray tomography combined with thermal diffusion simulations, and electrochemical transport measurements. The results allow comparison across a wide range of microstructures, and highlight the large impact of a relatively small numerical change in tortuosity on electrode kinetics. Under galvanostatic discharge, optimized microstructures show a three- to fourfold increase in area-specific capacity compared to typical Li-ion composite electrodes. Hybrid pulse power characterization (HPPC) demonstrates improved power capability, while dynamic stress tests (DST) shows that an area-specific area capacity corresponding to 91% of the NCA galvanostatic C/10 capacity could be reached.},
doi = {10.1149/2.1321802jes},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 2,
volume = 165,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1149/2.1321802jes

Citation Metrics:
Cited by: 9 works
Citation information provided by
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Figures / Tables:

Figure 1 Figure 1: Scheme of a freeze-casting stage as used in the present work. Adapted from “Biomaterials by freeze casting”, by Wegst et al., 2010, Phil. Trans. R. Soc. A, 368, p. 2099–2121. Adapted with permission.

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Works referenced in this record:

A comprehensive understanding of electrode thickness effects on the electrochemical performances of Li-ion battery cathodes
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Battery materials for ultrafast charging and discharging
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Freeze-Casting of Porous Ceramics: A Review of Current Achievements and Issues
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