Analytical Sciences

Abstract − Analytical Sciences, 37(10), 1477 (2021).

High-Temperature Pulsed-Field-Gradient 7Li-NMR Measurements of Li2CO3 over 700 K
Kenjiro HASHI, Shinobu OHKI, Yuuki MOGAMI, Atsushi GOTO, and Tadashi SHIMIZU
National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
Understanding the transport property of Li ions is crucial for improving the performance of Li-ion batteries. To investigate the ion diffusion at high temperatures, we constructed a high-temperature pulsed-field-gradient (PFG) nuclear magnetic resonance (NMR) probe capable of measurements at temperatures >700 K. The accuracy of the sample temperature was confirmed via 79Br NMR measurements of KBr. 7Li PFG-NMR measurements of Li2CO3 were performed at temperatures up to 724 K using the probe. The apparent diffusion coefficient of Li ions in Li2CO3 was obtained experimentally.