A1 Journal article (refereed)
Synergistic effects of low-level magnesium and chromium doping on the electrochemical performance of LiNiO2 cathodes (2024)

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

JYU authors or editors

Publication details

All authors or editors: Laine, Petteri; Välikangas, Juho; Kauppinen, Toni; Hu, Tao; Wang, Shubo; King, Graham; Singh, Harishchandra; Tynjälä, Pekka; Lassi, Ulla

Journal or series: Journal of Solid State Electrochemistry

ISSN: 1432-8488

eISSN: 1433-0768

Publication year: 2024

Publication date: 06/09/2023

Volume: 28

Issue number: 1

Pages range: 85-101

Publisher: Springer

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1007/s10008-023-05652-1

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/88982

Abstract

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.

Keywords: lithium-ion batteries; electrodes; doping (semiconductor technology); magnesium; chromium; electrochemistry

Free keywords: LiNiO2; cathode material; magnesium and chromium doping; co-precipitation; cobalt free

Contributing organizations

Ministry reporting: Yes

VIRTA submission year: 2023

Preliminary JUFO rating: 1