Abstract
Abstract Precycling of lithium (Li) metal on a nickel substrate at low temperatures (0 and −20°C) in propylene carbonate (PC) mixed with dimethyl carbonate (DMC) and Li hexafluorophosphate (LiPF 6 ) (LiPF 6 -PC/DMC) was found to enhance Li cycleability in the subsequent cycles at a room temperature (25°C). In contrast when the precycling at the low temperatures was performed in PC mixed with 2-methyltetrahydrofuran (2MeTHF) and LiPF 6 (LiPF 6 -PC/2MeTHF), no improvement in the Li cycling efficiency was observed in the subsequent cycles at 25°C. These results suggest that the low-temperature precycling effect on the Li cycleability depends on a co-solvent used in the PC-based electrolytes. Ac impedance analysis revealed that the precycling in the low-temperature LiPF 6 -PC/DMC electrolyte provided a compact Li interface with a low resistance. In marked constant to this, a Li anode interface formed by the precycling in the LiPF 6 -PC/2MeTHF system was irregular and resistive to Li-ion diffusion. The origins of the low-temperature precycling effect dependent on the co-solvents were discussed.
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