16th International Conference on Muon Spin Rotation, Relaxation and Resonance (μSR2025)

Observation of Na and Li Ion Diffusion in Battery Materials NaCrO2 and LiCrO2 by μSR

21 Jul 2025, 13:30

20m

Contributed Oral Energy storage materials Oral Contributions

Speaker

Izumi Umegaki (KEK (High Energy Accelerator Research Organization))

Description

Sodium ion batteries have been attractive and developed eagerly for practical use as one of post Lithium ion batteries. Battery materials NaCrO${}_2$ and LiCrO${}_2$ share an identical crystal structure: i.e., a two dimensional layered rock-salt type structure. NaCrO${}_2$ shows high performance with a large capacity of 200 mAh in charge/discharge cycles, while LiCrO${}_2$ has a small capacity in a few cycles. To study the difference in the ion diffusion of the two materials, $\mu$SR measurements were performed at ISIS, Rutherford Appleton Laboratory. Although the obtained $\mu$SR spectra showed a dynamic behavior above 250 K in both materials, the hopping rate of Na${}^{+}$ is about three times higher than that of Li${}^{+}$ at 400 K. This is consistent with the electrochemical properties of NaCrO${}_2$ and LiCrO${}_2$.

Presentation materials

IzumiUmegaki-21July.pptx