Electrochemistry of a nickel electrode in propylene carbonate [PC] containing LiClO_4, LiCf_3SO_3, LiPF_6 was studied through a micro electrode ( PHI chemical bounds 2t mu m) techniques in the wide potential range between +4.5 and -0.2V vs. Li/Li~+. Common pronounced peaks were observed in the potential range positive to lithium electrodeposition on nickel in all electrolyte solutions examined. Thus, these peaks can be attributed to reactions related to Li or commonly contained contaminants such as water and acide. In particular, the peak which appeared at the most negative potential seemed to the underpotential deposition (UPD) of lithium.
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