NIMS has found for the first time that a voltage increase that occurs in lithium-air batteries when they are being charged—a major issue preventing their practical use—is strongly and positively correlated with the degree of crystallinity of lithium peroxide (Li2O2), a compound produced during a discharge cycle.

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Arghya Dutta, Kimihiko Ito, Akihiro Nomura, Yoshimi Kubo, Adv. Sci. 7, 2001660 (2020). "Quantitative Delineation of the Low Energy Decomposition Pathway for Lithium Peroxide in Lithium-Oxygen Battery"
DOI: 10.1002/advs.202001660