Characterisation and modelling of potassium-ion batteries.

Autor: Dhir S; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK., Cattermull J; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK.; Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3PH, UK., Jagger B; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK., Schart M; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK., Olbrich LF; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK., Chen Y; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK., Zhao J; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK., Sada K; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK., Goodwin A; Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3PH, UK., Pasta M; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK. mauro.pasta@materials.ox.ac.uk.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Aug 31; Vol. 15 (1), pp. 7580. Date of Electronic Publication: 2024 Aug 31.
DOI: 10.1038/s41467-024-51537-w
Abstrakt: Potassium-ion batteries (KIBs) are emerging as a promising alternative technology to lithium-ion batteries (LIBs) due to their significantly reduced dependency on critical minerals. KIBs may also present an opportunity for superior fast-charging compared to LIBs, with significantly faster K-ion electrolyte transport properties already demonstrated. In the absence of a viable K-ion electrolyte, a full-cell KIB rate model in commercial cell formats is required to determine the fast-charging potential for KIBs. However, a thorough and accurate characterisation of the critical electrode material properties determining rate performance-the solid state diffusivity and exchange current density-has not yet been conducted for the leading KIB electrode materials. Here, we accurately characterise the effective solid state diffusivities and exchange current densities of the graphite negative electrode and potassium manganese hexacyanoferrate K 2 Mn [ Fe ( CN ) 6 ] (KMF) positive electrode, through a combination of optimised material design and state-of-the-art analysis. Finally, we present a Doyle-Fuller-Newman model of a KIB full cell with realistic geometry and loadings, identifying the critical materials properties that limit their rate capability.
(© 2024. The Author(s).)
Databáze: MEDLINE
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