Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA)
<p dir="ltr">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 p...
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2018
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| _version_ | 1864513513515384832 |
|---|---|
| author | Benjamin Delattre (1860598) |
| author2 | Ruhul Amin (2113627) Jonathan Sander (11434609) Joël De Coninck (18628702) Antoni P. Tomsia (1971394) Yet-Ming Chiang (1437370) |
| author2_role | author author author author author |
| author_facet | Benjamin Delattre (1860598) Ruhul Amin (2113627) Jonathan Sander (11434609) Joël De Coninck (18628702) Antoni P. Tomsia (1971394) Yet-Ming Chiang (1437370) |
| author_role | author |
| dc.creator.none.fl_str_mv | Benjamin Delattre (1860598) Ruhul Amin (2113627) Jonathan Sander (11434609) Joël De Coninck (18628702) Antoni P. Tomsia (1971394) Yet-Ming Chiang (1437370) |
| dc.date.none.fl_str_mv | 2018-02-02T03:00:00Z |
| dc.identifier.none.fl_str_mv | 10.1149/2.1321802jes |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/journal_contribution/Impact_of_Pore_Tortuosity_on_Electrode_Kinetics_in_Lithium_Battery_Electrodes_Study_in_Directionally_Freeze-Cast_LiNi_sub_0_8_sub_Co_sub_0_15_sub_Al_sub_0_05_sub_O_sub_2_sub_NCA_/25919422 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Engineering Chemical engineering Electrical engineering Materials engineering Electrode fabrication Calendering Pore tortuosity Freeze-casting Microstructure Cathode Porosity |
| dc.title.none.fl_str_mv | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA) |
| dc.type.none.fl_str_mv | Text Journal contribution info:eu-repo/semantics/publishedVersion text contribution to journal |
| description | <p dir="ltr">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<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub> (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.</p><h2>Other Information</h2><p dir="ltr">Published in: Journal of The Electrochemical Society<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1149/2.1321802jes" target="_blank">https://dx.doi.org/10.1149/2.1321802jes</a></p> |
| eu_rights_str_mv | openAccess |
| id | Manara2_f0327474f82d3783a27677205e9882d2 |
| identifier_str_mv | 10.1149/2.1321802jes |
| network_acronym_str | Manara2 |
| network_name_str | Manara2 |
| oai_identifier_str | oai:figshare.com:article/25919422 |
| publishDate | 2018 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA)Benjamin Delattre (1860598)Ruhul Amin (2113627)Jonathan Sander (11434609)Joël De Coninck (18628702)Antoni P. Tomsia (1971394)Yet-Ming Chiang (1437370)EngineeringChemical engineeringElectrical engineeringMaterials engineeringElectrode fabricationCalenderingPore tortuosityFreeze-castingMicrostructureCathodePorosity<p dir="ltr">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<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub> (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.</p><h2>Other Information</h2><p dir="ltr">Published in: Journal of The Electrochemical Society<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1149/2.1321802jes" target="_blank">https://dx.doi.org/10.1149/2.1321802jes</a></p>2018-02-02T03:00:00ZTextJournal contributioninfo:eu-repo/semantics/publishedVersiontextcontribution to journal10.1149/2.1321802jeshttps://figshare.com/articles/journal_contribution/Impact_of_Pore_Tortuosity_on_Electrode_Kinetics_in_Lithium_Battery_Electrodes_Study_in_Directionally_Freeze-Cast_LiNi_sub_0_8_sub_Co_sub_0_15_sub_Al_sub_0_05_sub_O_sub_2_sub_NCA_/25919422CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/259194222018-02-02T03:00:00Z |
| spellingShingle | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA) Benjamin Delattre (1860598) Engineering Chemical engineering Electrical engineering Materials engineering Electrode fabrication Calendering Pore tortuosity Freeze-casting Microstructure Cathode Porosity |
| status_str | publishedVersion |
| title | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA) |
| title_full | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA) |
| title_fullStr | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA) |
| title_full_unstemmed | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA) |
| title_short | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA) |
| title_sort | Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>(NCA) |
| topic | Engineering Chemical engineering Electrical engineering Materials engineering Electrode fabrication Calendering Pore tortuosity Freeze-casting Microstructure Cathode Porosity |