Sökning: onr:"swepub:oai:DiVA.org:uu-487239" >
Effect of Cu substi...
Effect of Cu substitution on anion redox behaviour in P3-type sodium manganese oxides
-
- Linnell, Stephanie F. (författare)
- Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland.;Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England.
-
- Manche, Alexis G. (författare)
- Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland.;Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England.
-
- Liao, Yingling (författare)
- Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland.;Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England.
-
visa fler...
-
- Hirsbrunner, Moritz (författare)
- Uppsala universitet,Energimaterialens fysik
-
- Imada, Saki (författare)
- Kyoto Inst Technol, Fac Elect Engn & Elect, Sakyo Ku, Kyoto 6068585, Japan.
-
- Naden, Aaron B. (författare)
- Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England.
-
- Irvine, John T. S. (författare)
- Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland.;Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England.
-
- Duda, Laurent (författare)
- Uppsala universitet,Energimaterialens fysik
-
- Armstrong, A. Robert (författare)
- Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland.;Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England.
-
visa färre...
-
Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland;Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England. Energimaterialens fysik (creator_code:org_t)
- 2022-10-12
- 2022
- Engelska.
-
Ingår i: Journal of Physics. - : Institute of Physics (IOP). - 2515-7655. ; 4:4
- Relaterad länk:
-
https://doi.org/10.1...
-
visa fler...
-
https://uu.diva-port... (primary) (Raw object)
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Sodium layered oxides which display oxygen anion redox behaviour are considered promising positive electrodes for sodium-ion batteries because they offer increased specific capacities. However, they suffer from irreversible structural changes resulting in significant capacity loss and limited oxygen redox reversibility. Here the effect of Cu substitution on the electrochemical performance of P3-type sodium manganese oxide is examined by evaluating the structural and electronic structural evolution upon cycling, supported by density functional theory (DFT) calculations. Over the voltage range 1.8-3.8 V vs. Na/Na+, where the redox reactions of the transition metal ions contribute entirely towards the charge compensation mechanism, stable cycling performance is maintained, showing a capacity retention of 90% of the initial discharge capacity of 166 mA h g(-1) after 40 cycles at 10 mA g(-1). Over an extended voltage range of 1.8-4.3 V vs. Na/Na+, oxygen anion redox is invoked, with a voltage hysteresis of 110 mV and a greater initial discharge capacity of 195 mA h g(-1) at 10 mA g(-1) is reached. Ex-situ powder x-ray diffraction patterns reveal distortion of the P3 structure to P ' 3 after charge to 4.3 V, and then transformation to O ' 3 upon discharge to 1.8 V, which contributes towards the capacity fade observed between the voltage range 1.8-4.3 V. DFT with projected density of states calculations reveal a strong covalency between the copper and oxygen atoms which facilitate both the cationic and anionic redox reactions in P3-type Na0.67Mn0.9Cu0.1O2.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- sodium-ion batteries
- cathode materials
- layered oxides
- anion redox
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas