Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA)
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 an...
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| Format: | Article |
| Language: | English |
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The Electrochemical Society
2020
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| Online Access: | https://hdl.handle.net/1721.1/125001 |
| _version_ | 1826199504044425216 |
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| author | Delattre, Benjamin Amin, Ruhul Sander, Jonathan De Coninck, Joël Tomsia, Antoni P. Chiang, Yet-Ming |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Delattre, Benjamin Amin, Ruhul Sander, Jonathan De Coninck, Joël Tomsia, Antoni P. Chiang, Yet-Ming |
| author_sort | Delattre, Benjamin |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T11:20:58Z |
| format | Article |
| id | mit-1721.1/125001 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:20:58Z |
| publishDate | 2020 |
| publisher | The Electrochemical Society |
| record_format | dspace |
| spelling | mit-1721.1/1250012022-10-01T03:02:21Z Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) Delattre, Benjamin Amin, Ruhul Sander, Jonathan De Coninck, Joël Tomsia, Antoni P. Chiang, Yet-Ming Massachusetts Institute of Technology. Department of Materials Science and Engineering 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. United States. Department of Energy. Office of Vehicle Technologies (Grant DE-AC02-05CH11231) United States. Department of Energy. Advanced Battery Materials Research Program (Grant 7056592) 2020-05-05T13:44:20Z 2020-05-05T13:44:20Z 2018-02 2017-10 2019-09-17T17:26:07Z Article http://purl.org/eprint/type/JournalArticle 0013-4651 1945-7111 https://hdl.handle.net/1721.1/125001 Delattre, Benjamin et al. "Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA)." Journal of The Electrochemical Society 165, 2 (February 2018): A388-A395. ©2018 The Author(s) en http://dx.doi.org/10.1149/2.1321802jes Journal of The Electrochemical Society Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf The Electrochemical Society Electrochemical Society (ECS) |
| spellingShingle | 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 LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) |
| title | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) |
| title_full | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) |
| title_fullStr | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) |
| title_full_unstemmed | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) |
| title_short | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) |
| title_sort | impact of pore tortuosity on electrode kinetics in lithium battery electrodes study in directionally freeze cast lini 0 8 co 0 15 al 0 05 o 2 nca |
| url | https://hdl.handle.net/1721.1/125001 |
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