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  • House, Robert A.Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England (author)

What Triggers Oxygen Loss in Oxygen Redox Cathode Materials?

  • Article/chapterEnglish2019

Publisher, publication year, extent ...

  • 2019-04-05
  • AMER CHEMICAL SOC,2019
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-386161
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-386161URI
  • https://doi.org/10.1021/acs.chemmater.9b00227DOI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • It is possible to increase the charge capacity of transition metal (TM) oxide cathodes in alkali-ion batteries by invoking redox reactions on the oxygen. However, oxygen loss often occurs. To explore what affects oxygen loss in oxygen redox materials, we have compared two analogous Na-ion cathodes, P2-Na0.67Mg0.28Mn0.72O2 and P2-Na0.78Li0.25Mn0.75O2. On charging to 4.5 V, >0.4e(-) are removed from the oxide ions of these materials, but neither compound exhibits oxygen loss. Li is retained in P2-Na0.78Li0.25Mn0.25O2 but displaced from the TM to the alkali metal layers, showing that vacancies in the TM layers, which also occur in other oxygen redox compounds that exhibit oxygen loss such as Li[Li0.2Ni0.2Mn0.6]O-2, are not a trigger for oxygen loss. On charging at 5 V, P2-Na0.78Li0.25Mn0.75O2 exhibits oxygen loss, whereas P2-Na0.67Mg0.28Mn0.72O2 does not. Under these conditions, both Na+ and Li+ are removed from P2-Na0.78Li0.25Mn0.75O2, resulting in underbonded oxygen (fewer than 3 cations coordinating oxygen) and surface-localized O loss. In contrast, for P2-Na0.67Mg0.28Mn0.72O2, oxygen remains coordinated by at least 2 Mn4+ and 1 Mg2+ ions, stabilizing the oxygen and avoiding oxygen loss.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Maitra, UrmimalaUniv Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England;Justus Liebig Univ Giessen, Inst Phys Chem, Heinrich Buff Ring 17,Room B48, D-35392 Giessen, Germany (author)
  • Jin, LiyuUniv Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England (author)
  • Lozano, Juan G.Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England (author)
  • Somerville, James W.Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England (author)
  • Rees, Nicholas H.Univ Oxford, Dept Chem, Mansfield Rd, Oxford OX1 3TA, England (author)
  • Naylor, Andrew J.Uppsala universitet,Strukturkemi(Swepub:uu)andna283 (author)
  • Duda, LaurentUppsala universitet,Molekyl- och kondenserade materiens fysik(Swepub:uu)laurduda (author)
  • Massel, FelixUppsala universitet,Molekyl- och kondenserade materiens fysik(Swepub:uu)felma561 (author)
  • Chadwick, Alan V.Univ Kent, Sch Phys Sci, Canterbury CT2 7NH, Kent, England (author)
  • Ramos, SilviaUniv Kent, Sch Phys Sci, Canterbury CT2 7NH, Kent, England (author)
  • Pickup, David M.Univ Kent, Sch Phys Sci, Canterbury CT2 7NH, Kent, England (author)
  • McNally, Daniel E.Paul Scherrer Inst, Swiss Light Source, Photon Sci Div, CH-5232 Villigen, Switzerland (author)
  • Lu, XingyePaul Scherrer Inst, Swiss Light Source, Photon Sci Div, CH-5232 Villigen, Switzerland (author)
  • Schmitt, ThorstenPaul Scherrer Inst, Swiss Light Source, Photon Sci Div, CH-5232 Villigen, Switzerland (author)
  • Roberts, Matthew R.Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England (author)
  • Bruce, Peter G.Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England;Univ Oxford, Faraday Inst, Mansfield Rd, Oxford OX1 3TA, England;Univ Oxford, Dept Chem, Mansfield Rd, Oxford OX1 3TA, England (author)
  • Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, EnglandUniv Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England;Justus Liebig Univ Giessen, Inst Phys Chem, Heinrich Buff Ring 17,Room B48, D-35392 Giessen, Germany (creator_code:org_t)

Related titles

  • In:Chemistry of Materials: AMER CHEMICAL SOC31:9, s. 3293-33000897-47561520-5002

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