Analytical Sciences

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.

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