The role of O2 in O-redox cathodes for Li-ion batteries
The energy density of Li-ion batteries can be improved by storing charge at high voltages through the oxidation of oxide ions in the cathode material. However, oxidising O2- triggers irreversible structural rearrangements in the bulk and an associated loss of the high voltage plateau replacing it wi...
| Päätekijät: | , , , , , |
|---|---|
| Aineistotyyppi: | Journal article |
| Kieli: | English |
| Julkaistu: |
Springer Nature
2021
|
| _version_ | 1826290724975411200 |
|---|---|
| author | House, R Marie, J-J Pérez-Osorio, MA Rees, G Boivin, E Bruce, PG |
| author_facet | House, R Marie, J-J Pérez-Osorio, MA Rees, G Boivin, E Bruce, PG |
| author_sort | House, R |
| collection | OXFORD |
| description | The energy density of Li-ion batteries can be improved by storing charge at high voltages through the oxidation of oxide ions in the cathode material. However, oxidising O2- triggers irreversible structural rearrangements in the bulk and an associated loss of the high voltage plateau replacing it with a lower discharge voltage, as well as a loss of O2 accompanied by densification at the surface. Here we consider various models for O-redox proposed in the literature before describing a single unified model involving O2- oxidation to form O2, which is trapped in the bulk with the balance evolving from the surface. The model extends the O2 formation and evolution at the surface, which is well-known and well-characterised, into the electrode particle bulk as caged O2 that can be reversibly reduced and oxidised. This converged understanding allows us to propose practical strategies for avoiding O-redox-induced instability offering potential routes towards more reversible high energy density Li-ion cathodes.
|
| first_indexed | 2024-03-07T02:48:35Z |
| format | Journal article |
| id | oxford-uuid:ace2b03a-e5e2-407f-b443-50a8763749d7 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:48:35Z |
| publishDate | 2021 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | oxford-uuid:ace2b03a-e5e2-407f-b443-50a8763749d72022-03-27T03:31:55ZThe role of O2 in O-redox cathodes for Li-ion batteriesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ace2b03a-e5e2-407f-b443-50a8763749d7EnglishSymplectic ElementsSpringer Nature2021House, RMarie, J-JPérez-Osorio, MARees, GBoivin, EBruce, PGThe energy density of Li-ion batteries can be improved by storing charge at high voltages through the oxidation of oxide ions in the cathode material. However, oxidising O2- triggers irreversible structural rearrangements in the bulk and an associated loss of the high voltage plateau replacing it with a lower discharge voltage, as well as a loss of O2 accompanied by densification at the surface. Here we consider various models for O-redox proposed in the literature before describing a single unified model involving O2- oxidation to form O2, which is trapped in the bulk with the balance evolving from the surface. The model extends the O2 formation and evolution at the surface, which is well-known and well-characterised, into the electrode particle bulk as caged O2 that can be reversibly reduced and oxidised. This converged understanding allows us to propose practical strategies for avoiding O-redox-induced instability offering potential routes towards more reversible high energy density Li-ion cathodes. |
| spellingShingle | House, R Marie, J-J Pérez-Osorio, MA Rees, G Boivin, E Bruce, PG The role of O2 in O-redox cathodes for Li-ion batteries |
| title | The role of O2 in O-redox cathodes for Li-ion batteries |
| title_full | The role of O2 in O-redox cathodes for Li-ion batteries |
| title_fullStr | The role of O2 in O-redox cathodes for Li-ion batteries |
| title_full_unstemmed | The role of O2 in O-redox cathodes for Li-ion batteries |
| title_short | The role of O2 in O-redox cathodes for Li-ion batteries |
| title_sort | role of o2 in o redox cathodes for li ion batteries |
| work_keys_str_mv | AT houser theroleofo2inoredoxcathodesforliionbatteries AT mariejj theroleofo2inoredoxcathodesforliionbatteries AT perezosorioma theroleofo2inoredoxcathodesforliionbatteries AT reesg theroleofo2inoredoxcathodesforliionbatteries AT boivine theroleofo2inoredoxcathodesforliionbatteries AT brucepg theroleofo2inoredoxcathodesforliionbatteries AT houser roleofo2inoredoxcathodesforliionbatteries AT mariejj roleofo2inoredoxcathodesforliionbatteries AT perezosorioma roleofo2inoredoxcathodesforliionbatteries AT reesg roleofo2inoredoxcathodesforliionbatteries AT boivine roleofo2inoredoxcathodesforliionbatteries AT brucepg roleofo2inoredoxcathodesforliionbatteries |