University of Oulu

Laine, P., Välikangas, J., Kauppinen, T. et al. Synergistic effects of low - level magnesium and chromium doping on the electrochemical performance of LiNiO2 cathodes. J Solid State Electrochem (2023).

Synergistic effects of low - level magnesium and chromium doping on the electrochemical performance of LiNiO₂ cathodes

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Author: Laine, Petteri1,2; Välikangas, Juho1,2; Kauppinen, Toni1,2;
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4000, FI-90014, Oulu, Finland
2University of Jyvaskyla, Kokkola University Consortium Chydenius, Talonpojankatu 2B, FI-67100, Kokkola, Finland
3Nano and Molecular Systems Research Unit (NANOMO), University of Oulu, FI-90014, Oulu, Finland
4Canadian Light Source, 44 Innovation Blvd, Saskatoon, SK, S7N 2V3, Canada
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.8 MB)
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Language: English
Published: Springer Nature, 2023
Publish Date: 2023-09-11


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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Series: Journal of solid state electrochemistry
ISSN: 1432-8488
ISSN-E: 1433-0768
ISSN-L: 1432-8488
Volume: Online first
DOI: 10.1007/s10008-023-05652-1
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: 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).
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