Na-ion mobility in P2-type Na0.5MgxNi0.17-xMn0.83O2 (0 <= x <= 0.07) from electrochemical and muon spin relaxation studies
Artikel i vetenskaplig tidskrift, 2021

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.


Le Anh Ma

Uppsala universitet

Rasmus Palm

Kungliga Tekniska Högskolan (KTH)

Elisabetta Nocerino

Kungliga Tekniska Högskolan (KTH)

Ola Kenji Forslund

Kungliga Tekniska Högskolan (KTH)

Nami Matsubara

Kungliga Tekniska Högskolan (KTH)

Stephen Cottrell

STFC Rutherford Appleton Laboratory

Koji Yokoyama

STFC Rutherford Appleton Laboratory

Akihiro Koda

High Energy Accelerator Research Organization

Jun Sugiyama

Comprehensive Research Organization for Science and Society (CROSS)

Japan Atomic Energy Agency

Yasmine Sassa

Chalmers, Fysik, Materialfysik

Martin Mansson

Kungliga Tekniska Högskolan (KTH)

Reza Younesi

Uppsala universitet

Physical Chemistry Chemical Physics

1463-9076 (ISSN) 1463-9084 (eISSN)

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