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Probing the effect ...
Probing the effect of Mg doping on triclinic Na2Mn3O7 transition metal oxide as cathode material for sodium-ion batteries
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Siriwardena, D. P. (författare)
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Fernando, J. F. S. (författare)
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Wang, T. (författare)
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Firestein, K. L. (författare)
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Zhang, C. (författare)
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Brand, H. E. A. (författare)
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Jones, M. W. M. (författare)
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Kewish, C. M. (författare)
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Berntsen, P. (författare)
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Jenkins, T. (författare)
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Lewis, C. -EM. (författare)
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von Treifeldt, J. E. (författare)
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Dubal, D. P. (författare)
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Golberg, D. V. (författare)
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- Elsevier Ltd, 2021
- 2021
- Engelska.
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Ingår i: Electrochimica Acta. - : Elsevier Ltd. - 0013-4686 .- 1873-3859. ; 394
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Triclinic Na2Mn3O7 has been identified as a promising material for high-capacity sodium-ion batteries. However, the knowledge on the effect of doping of metal ions and structural transformations of Na2Mn3O7 during dis(charge) is limited. Integration of alkali metal-ions, specially Mg2+ can enhance the electrochemical properties in transition metal oxides. Herein, a series of Mg2+ doped triclinic Na2Mn3O7 cathode materials was explored for the first time. Electrochemical analysis revealed that Mg2+ improves specific capacities, and rate capabilities. Ex situ X-ray diffraction (XRD) and Galvanostatic charge discharge cycling (GCD) showed that the triclinic phase reversibly converts into two monoclinic phases at high Na+ insertion levels. Na+ extraction at high potentials is supported by another biphasic region which converts to a major triclinic phase at the end of the charge. GCD, cyclic voltammetry (CV) and ex situ X-ray absorption spectroscopy (XAS) documented that the capacity mainly evolved through a Mn4+/3+ redox couple and a reversible O2-/n− redox reaction. CV and Galvanostatic intermittent titration techniques (GITT) showed that Mg2+ reduces the Na+-vacancy ordering and improves the Na+ diffusion. The 2 mol.% Mg-doped material exhibited a high specific capacity of 143 mAh/g after 30 cycles and a rate capability of 93 mAh/g (at 500 mA/g). GCD analysis demonstrated that O2-/n− redox is remarkably stable up to at least 90 cycles. Full cells made using the 0.5 mol.% Mg-doped material displayed a promising discharge specific capacity of 80 mAh/g. The effects of cation doping into the complex crystal structures, phase transformations during Na+ de(intercalation) and the importance of O2-/n− redox for achieving high capacities were uncovered. The findings of this work will guide the design of novel cathode materials for sodium-ion batteries. © 2021
Nyckelord
- Anion redox
- Cathode materials
- Full cell
- Na2Mn3O7
- Sodium-ion batteries
- Cathodes
- Cyclic voltammetry
- Doping (additives)
- Electric discharges
- Metal ions
- Redox reactions
- Sodium compounds
- Transition metal oxides
- Transition metals
- X ray absorption spectroscopy
- Cathodes material
- Charge discharge cycling
- Galvanostatic charge/discharge
- Mg$-2$
- Mg$-2$
- Mg-doping
- Sodium ion batteries
- Transition-metal oxides
- Manganese compounds
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Till lärosätets databas
- Av författaren/redakt...
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Siriwardena, D. ...
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Fernando, J. F. ...
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Wang, T.
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Firestein, K. L.
-
Zhang, C.
-
Brand, H. E. A.
-
visa fler...
-
Jones, M. W. M.
-
Kewish, C. M.
-
Berntsen, P.
-
Jenkins, T.
-
Lewis, C. -EM.
-
von Treifeldt, J ...
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Dubal, D. P.
-
Golberg, D. V.
-
visa färre...
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Electrochimica A ...
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