Oxide Cathodes: Functions, Instabilities, Self Healing, and Degradation Mitigations
Recent progress in high-energy-density oxide cathodes for lithium-ion batteries has pushed the limits of lithium usage and accessible redox couples. It often invokes hybrid anion- and cation-redox (HACR), with exotic valence states such as oxidized oxygen ions under high voltages. Electrochemical cy...
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| Format: | Article |
| Language: | English |
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American Chemical Society (ACS)
2023
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| Online Access: | https://hdl.handle.net/1721.1/147402 |
| _version_ | 1826197162423222272 |
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| author | Dong, Yanhao Li, Ju |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Dong, Yanhao Li, Ju |
| author_sort | Dong, Yanhao |
| collection | MIT |
| description | Recent progress in high-energy-density oxide cathodes for lithium-ion batteries has pushed the limits of lithium usage and accessible redox couples. It often invokes hybrid anion- and cation-redox (HACR), with exotic valence states such as oxidized oxygen ions under high voltages. Electrochemical cycling under such extreme conditions over an extended period can trigger various forms of chemical, electrochemical, mechanical, and microstructural degradations, which shorten the battery life and cause safety issues. Mitigation strategies require an in-depth understanding of the underlying mechanisms. Here we offer a systematic overview of the functions, instabilities, and peculiar materials behaviors of the oxide cathodes. We note unusual anion and cation mobilities caused by high-voltage charging and exotic valences. It explains the extensive lattice reconstructions at room temperature in both good (plasticity and self-healing) and bad (phase change, corrosion, and damage) senses, with intriguing electrochemomechanical coupling. The insights are critical to the understanding of the unusual self-healing phenomena in ceramics (e.g., grain boundary sliding and lattice microcrack healing) and to novel cathode designs and degradation mitigations (e.g., suppressing stress-corrosion cracking and constructing reactively wetted cathode coating). Such mixed ionic-electronic conducting, electrochemically active oxides can be thought of as almost "metalized" if at voltages far from the open-circuit voltage, thus differing significantly from the highly insulating ionic materials in electronic transport and mechanical behaviors. These characteristics should be better understood and exploited for high-performance energy storage, electrocatalysis, and other emerging applications. |
| first_indexed | 2024-09-23T10:43:28Z |
| format | Article |
| id | mit-1721.1/147402 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:43:28Z |
| publishDate | 2023 |
| publisher | American Chemical Society (ACS) |
| record_format | dspace |
| spelling | mit-1721.1/1474022023-11-24T06:12:44Z Oxide Cathodes: Functions, Instabilities, Self Healing, and Degradation Mitigations Dong, Yanhao Li, Ju Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Recent progress in high-energy-density oxide cathodes for lithium-ion batteries has pushed the limits of lithium usage and accessible redox couples. It often invokes hybrid anion- and cation-redox (HACR), with exotic valence states such as oxidized oxygen ions under high voltages. Electrochemical cycling under such extreme conditions over an extended period can trigger various forms of chemical, electrochemical, mechanical, and microstructural degradations, which shorten the battery life and cause safety issues. Mitigation strategies require an in-depth understanding of the underlying mechanisms. Here we offer a systematic overview of the functions, instabilities, and peculiar materials behaviors of the oxide cathodes. We note unusual anion and cation mobilities caused by high-voltage charging and exotic valences. It explains the extensive lattice reconstructions at room temperature in both good (plasticity and self-healing) and bad (phase change, corrosion, and damage) senses, with intriguing electrochemomechanical coupling. The insights are critical to the understanding of the unusual self-healing phenomena in ceramics (e.g., grain boundary sliding and lattice microcrack healing) and to novel cathode designs and degradation mitigations (e.g., suppressing stress-corrosion cracking and constructing reactively wetted cathode coating). Such mixed ionic-electronic conducting, electrochemically active oxides can be thought of as almost "metalized" if at voltages far from the open-circuit voltage, thus differing significantly from the highly insulating ionic materials in electronic transport and mechanical behaviors. These characteristics should be better understood and exploited for high-performance energy storage, electrocatalysis, and other emerging applications. 2023-01-19T19:17:05Z 2023-01-19T19:17:05Z 2022-11-18 2023-01-19T18:53:02Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/147402 Dong, Yanhao and Li, Ju. 2022. "Oxide Cathodes: Functions, Instabilities, Self Healing, and Degradation Mitigations." Chemical Reviews. en 10.1021/acs.chemrev.2c00251 Chemical Reviews Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Chemical Society (ACS) MIT web domain |
| spellingShingle | Dong, Yanhao Li, Ju Oxide Cathodes: Functions, Instabilities, Self Healing, and Degradation Mitigations |
| title | Oxide Cathodes: Functions, Instabilities, Self Healing, and Degradation Mitigations |
| title_full | Oxide Cathodes: Functions, Instabilities, Self Healing, and Degradation Mitigations |
| title_fullStr | Oxide Cathodes: Functions, Instabilities, Self Healing, and Degradation Mitigations |
| title_full_unstemmed | Oxide Cathodes: Functions, Instabilities, Self Healing, and Degradation Mitigations |
| title_short | Oxide Cathodes: Functions, Instabilities, Self Healing, and Degradation Mitigations |
| title_sort | oxide cathodes functions instabilities self healing and degradation mitigations |
| url | https://hdl.handle.net/1721.1/147402 |
| work_keys_str_mv | AT dongyanhao oxidecathodesfunctionsinstabilitiesselfhealinganddegradationmitigations AT liju oxidecathodesfunctionsinstabilitiesselfhealinganddegradationmitigations |