Synergistic effects of low-level magnesium and chromium doping on the electrochemical performance of LiNiO2 cathodes
Laine, P., Välikangas, J., Kauppinen, T., Hu, T., Wang, S., King, G., Singh, H., Tynjälä, P., & Lassi, U. (2024). Synergistic effects of low-level magnesium and chromium doping on the electrochemical performance of LiNiO2 cathodes. Journal of Solid State Electrochemistry, 28(1), 85-101. https://doi.org/10.1007/s10008-023-05652-1
Julkaistu sarjassa
Journal of Solid State ElectrochemistryTekijät
Hu, Tao |
Päivämäärä
2024Tekijänoikeudet
© 2023 the Authors
LiNiO2 cathode materials with magnesium and chromium doping were prepared using a simple low - cost and efficient co - precipitation and lithiation procedure. During this procedure, both magnesium and chromium form a concentrated core particle, unto which nickel hydroxide precipitates. During lithiation, the elements in question will redistribute themselves and form a homogenous mixture. Magnesium - containing materials exhibit an excellent electrochemical performance, due to phase stabilizing effects, while for chromium - containing materials, performance remains poor. Rietveld refinement reveals that there is a possible upper limit for Mg doping (~ 2.5 mol %) as a pilar dopant. Washing of the lithiated materials was explored, and it is proposed that this can improve capacity retention in prolonged cycling. However, the inevitable loss of lithium from the surface layer remains a challenge. Two sources for the chromium facilitated capacity decay are proposed, both owing to the highly irreversible redox reaction of hexavalent chromium possibly blocking lithium pathways.
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Julkaisija
SpringerISSN Hae Julkaisufoorumista
1432-8488Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/184732330
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Lisätietoja rahoituksesta
Open Access funding provided by University of Oulu including Oulu University Hospital. This research was funded by Business Finland, grant number (University of Oulu, BATCircle2.0, No. 44612 / 31 / 2020).Lisenssi
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