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Lithium ion cells comprising actual components of positive electrodes (LiCoO2, LiNixCoyAlz, and LiMn2O4) and negative electrodes (graphite and hard carbon) were assembled for in situ 7Li nuclear magnetic resonance (NMR) experiments. The 7Li NMR measurements of the cells revealed a “relaxation effect” after overcharging: a decrease of the signal assigned to Li metal deposited on the negative electrode...
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