Speaker
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$_2$.
| umegaki@post.kek.jp |
