[Press release] Elucidating Metal Deposition Mechanism in Battery Overcharging for Safety Assessment

A research group led by Associate Professor Kazuma Goto (Okayama University) and Principal Investigator Dr. Kenjiro Hashi (NIMS) has succeeded in real-time observation of metal (lithium or sodium) deposition phenomena on the anode during overcharging of lithium-ion and sodium-ion batteries. Using nuclear magnetic resonance (NMR) analysis, they unveiled the mechanism of overcharging that leads to battery ignition accidents. This technique allows direct monitoring of metal deposition inside battery electrodes, which was previously difficult, and reveals differences in deposition tendencies depending on the electrode structure.
　　These results are expected to contribute to evaluating the safety limits of rechargeable batteries, supporting safety assessment for reuse in electric vehicles (EVs), and advancing battery technology.

The results were published online in Journal of Materials Chemistry A on May 19, 2020, selected as one of the journal's Hot Papers for 2020, and featured in the July 28 issue.
Source: Okayama University and NIMS press release (Journal of Materials Chemistry A, May 19, 2020)

• K. Gotoh, T. Yamakami, I. Nishimura, H. Kometani, H. Ando, K. Hashi, T. Shimizu, and H. Ishida, "Mechanisms for overcharging of carbon electrodes in lithium-ion/sodium-ion batteries analysed by operando solid-state NMR",
  J. Mater. Chem. A, 2020,8, 14472-14481.
  DOI: 10.1039/D0TA04005C
• Okayama University Press Release (external site)

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