Characterization of Electronic and Ionic Transport in Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15]Al[subscript 0.05]O[subscript 2](NCA)
Despite the extensive commercial use of Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15] Al[subscript 0.05]O[subscript 2](NCA) as the positive electrode in Li-ion batteries, and its long research history, its fundamental transport properties are poorly understood. These properties are crucial fo...
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Electrochemical Society
2017
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| Online Access: | http://hdl.handle.net/1721.1/111836 https://orcid.org/0000-0002-0833-7674 |
| _version_ | 1826204233586704384 |
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| author | Amin, MD Ruhul Ravnsbaek, Dorthe Bomholdt 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 Amin, MD Ruhul Ravnsbaek, Dorthe Bomholdt Chiang, Yet-Ming |
| author_sort | Amin, MD Ruhul |
| collection | MIT |
| description | Despite the extensive commercial use of Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15] Al[subscript 0.05]O[subscript 2](NCA) as the positive electrode in Li-ion batteries, and its long research history, its fundamental transport properties are poorly understood. These properties are crucial for designing high energy density and high power Li-ion batteries. Here, the transport properties of NCA are investigated using impedance spectroscopy and dc polarization and depolarization techniques. The electronic conductivity is found to increase with decreasing Li-content from ∼10[superscript -4]Scm[superscript -1] to ∼10 [superscript -2] Scm [superscript -1] over x = 0.0 to 0.6, while lithium ion conductivity is at least five orders of magnitude lower for x = 0.0 to 0.75. A surprising result is that the lithium ionic diffusivity vs. x shows a v-shaped curve with aminimum at x=0.5, while the unit cell parameters show the opposite trend. This suggests that cation ordering has greater influence on the composition dependence than the Li layer separation, unlike other layered oxides. From temperature-dependent measurements in electron-blocking cells, the activation energy for lithium ion conductivity (diffusivity) is found to be 1.25 eV (1.20 eV). Chemical diffusion during electrochemical use is limited by lithium transport, but is fast enough over the entire state-of-charge range to allow charge/discharge of micron-scale particles at practical C-rates. |
| first_indexed | 2024-09-23T12:51:02Z |
| format | Article |
| id | mit-1721.1/111836 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:51:02Z |
| publishDate | 2017 |
| publisher | Electrochemical Society |
| record_format | dspace |
| spelling | mit-1721.1/1118362022-10-01T11:31:36Z Characterization of Electronic and Ionic Transport in Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15]Al[subscript 0.05]O[subscript 2](NCA) Amin, MD Ruhul Ravnsbaek, Dorthe Bomholdt Chiang, Yet-Ming Massachusetts Institute of Technology. Department of Materials Science and Engineering Amin, MD Ruhul Ravnsbaek, Dorthe Bomholdt Chiang, Yet-Ming Despite the extensive commercial use of Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15] Al[subscript 0.05]O[subscript 2](NCA) as the positive electrode in Li-ion batteries, and its long research history, its fundamental transport properties are poorly understood. These properties are crucial for designing high energy density and high power Li-ion batteries. Here, the transport properties of NCA are investigated using impedance spectroscopy and dc polarization and depolarization techniques. The electronic conductivity is found to increase with decreasing Li-content from ∼10[superscript -4]Scm[superscript -1] to ∼10 [superscript -2] Scm [superscript -1] over x = 0.0 to 0.6, while lithium ion conductivity is at least five orders of magnitude lower for x = 0.0 to 0.75. A surprising result is that the lithium ionic diffusivity vs. x shows a v-shaped curve with aminimum at x=0.5, while the unit cell parameters show the opposite trend. This suggests that cation ordering has greater influence on the composition dependence than the Li layer separation, unlike other layered oxides. From temperature-dependent measurements in electron-blocking cells, the activation energy for lithium ion conductivity (diffusivity) is found to be 1.25 eV (1.20 eV). Chemical diffusion during electrochemical use is limited by lithium transport, but is fast enough over the entire state-of-charge range to allow charge/discharge of micron-scale particles at practical C-rates. United States. Department of Energy (Contract DE-AC02-05CH11231) United States. Department of Energy. Office of Basic Energy Sciences (Award DE-SC0001294) United States. Department of Energy (Project DE-SC0002626) 2017-10-11T12:20:39Z 2017-10-11T12:20:39Z 2015-03 2015-03 2017-10-04T17:46:27Z Article http://purl.org/eprint/type/JournalArticle 0013-4651 1945-7111 http://hdl.handle.net/1721.1/111836 Amin, R. et al. “Characterization of Electronic and Ionic Transport in Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15]Al[subscript 0.05]O[subscript 2](NCA).” Journal of the Electrochemical Society 162, 7 (March 2015): A1163–A1169 © 2015 The Author(s) https://orcid.org/0000-0002-0833-7674 http://dx.doi.org/10.1149/2.0171507JES Journal of the Electrochemical Society Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Electrochemical Society The Electrochemical Society (ECS) |
| spellingShingle | Amin, MD Ruhul Ravnsbaek, Dorthe Bomholdt Chiang, Yet-Ming Characterization of Electronic and Ionic Transport in Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15]Al[subscript 0.05]O[subscript 2](NCA) |
| title | Characterization of Electronic and Ionic Transport in Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15]Al[subscript 0.05]O[subscript 2](NCA) |
| title_full | Characterization of Electronic and Ionic Transport in Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15]Al[subscript 0.05]O[subscript 2](NCA) |
| title_fullStr | Characterization of Electronic and Ionic Transport in Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15]Al[subscript 0.05]O[subscript 2](NCA) |
| title_full_unstemmed | Characterization of Electronic and Ionic Transport in Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15]Al[subscript 0.05]O[subscript 2](NCA) |
| title_short | Characterization of Electronic and Ionic Transport in Li[subscript 1-x]Ni[subscript 0.8]Co[subscript 0.15]Al[subscript 0.05]O[subscript 2](NCA) |
| title_sort | characterization of electronic and ionic transport in li subscript 1 x ni subscript 0 8 co subscript 0 15 al subscript 0 05 o subscript 2 nca |
| url | http://hdl.handle.net/1721.1/111836 https://orcid.org/0000-0002-0833-7674 |
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