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Effect of Ti-Substitution on the Properties of P3 Structure Na2/3Mn0.8Li0.2O2 Showing a Ribbon Superlattice
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- Linnell, Stephanie F. (author)
- Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland.;Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England.
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- Kim, Eun Jeong (author)
- Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland.;Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England.
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- Ma, Le Anh, 1992- (author)
- Uppsala universitet,Strukturkemi
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- Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland;Faraday Inst, Quad One,Harwell Sci & Innovat Campus, Didcot OX11 0RA, Oxon, England. Strukturkemi (creator_code:org_t)
- 2022-10-13
- 2022
- English.
- In: ChemElectroChem. - : Wiley-Blackwell. - 2196-0216. ; 9:19
- Journal article (peer-reviewed)
Abstract
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- Oxygen anion redox offers an effective strategy to enhance the energy density of layered oxide positive electrodes for sodium- and lithium-ion batteries. However, lattice oxygen loss and irreversible structural transformations over the first cycle may result in large voltage hysteresis, thereby impeding practical application. Herein, ribbon superstructure ordering of Li/transition-metal-ions was applied to suppress the voltage hysteresis combined with Ti-substitution to improve the cycling stability for P3-Na0.67Li0.2Ti0.15Mn0.65O2. When both cation and anion redox reactions are utilized, Na0.67Li0.2Ti0.15Mn0.65O2 delivers a reversible capacity of 172 mA h g(-1) after 25 cycles at 10 mA g(-1) between 1.6-4.4 V vs. Na+/Na. Ex-situ X-ray diffraction data reveal that the ribbon superstructure is retained with negligible unit cell volume expansion/contraction upon sodiation/desodiation. The performance as a positive electrode for Li-ion batteries was also evaluated and P3-Na0.67Li0.2Ti0.15Mn0.65O2 delivers a reversible capacity of 180 mA h g(-1) after 25 cycles at 10 mA g(-1) when cycled vs. Li+/Li between 2.0-4.8 V.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- Anion redox chemistry
- Layered compounds
- Positive electrode material
- Sodium
- Superstructure
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- ref (subject category)
- art (subject category)
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