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Na-ion mobility in P2-type Na0.5MgxNi0.17-xMn0.83O2 (0 <= x <= 0.07) from electrochemical and muon spin relaxation studies
Angstrom Lab, Dept Chem, Uppsala, Sweden..ORCID iD: 0000-0002-2293-1901
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0002-1129-9234
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0003-4441-8882
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0001-8879-7875
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2021 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 23, no 42, p. 24478-24486Article in journal (Refereed) Published
Abstract [en]

Sodium transition metal oxides with a layered structure are one of the most widely studied cathode materials for Na+-ion batteries. Since the mobility of Na+ in such cathode materials is a key factor that governs the performance of material, electrochemical and muon spin rotation and relaxation techniques are here used to reveal the Na+-ion mobility in a P2-type Na0.5MgxNi0.17-xMn0.83O2 (x = 0, 0.02, 0.05 and 0.07) cathode material. Combining electrochemical techniques such as galvanostatic cycling, cyclic voltammetry, and the galvanostatic intermittent titration technique with mu+SR, we have successfully extracted both self-diffusion and chemical-diffusion under a potential gradient, which are essential to understand the electrode material from an atomic-scale viewpoint. The results indicate that a small amount of Mg substitution has strong effects on the cycling performance and the Na+ mobility. Amongst the tested cathode systems, it was found that the composition with a Mg content of x = 0.02 resulted in the best cycling stability and highest Na+ mobility based on electrochemical and mu+SR results. The current study clearly shows that for developing a new generation of sustainable energy-storage devices, it is crucial to study and understand both the structure as well as dynamics of ions in the material on an atomic level.

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC) , 2021. Vol. 23, no 42, p. 24478-24486
National Category
Materials Chemistry
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URN: urn:nbn:se:kth:diva-304750DOI: 10.1039/d1cp03115eISI: 000711105100001PubMedID: 34698733Scopus ID: 2-s2.0-85119098432OAI: oai:DiVA.org:kth-304750DiVA, id: diva2:1613211
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QC 20211122

Available from: 2021-11-22 Created: 2021-11-22 Last updated: 2023-12-07Bibliographically approved

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Palm, RasmusNocerino, ElisabettaForslund, Ola KenjiMatsubara, NamiMånsson, Martin

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Ma, Le AnhPalm, RasmusNocerino, ElisabettaForslund, Ola KenjiMatsubara, NamiYokoyama, KojiMånsson, Martin
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Materials and Nanophysics
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Physical Chemistry, Chemical Physics - PCCP
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