ELECTROCHEMICAL DEPOSITION AND DISSOLUTION PROCESSES OF LITHIUM COMPOUND ON GOLD FROM PROPYLENE CARBONATE

The cathodic electrolysis of propylene carbonate containing lithium pe rchlorate was studied by means of an in-situ quartz crystal microbalan ce technique. A lithium compound was deposited at about +1.5 V vs. Li/ Li+ and dissolved at about +4.0 V vs. Li/Li+. In constant potential el ectrolysis at +0.9 V vs. Li/Li+, the deposition process was divided in to two stages. In the first stage, in which lithium carbonate was most probably deposited, an electrode reaction of ferrocene which was adde d to the solution was gradually retarded. In the second stage, in whic h some chemical reaction proceeded dominantly, the electrode reaction of ferrocene was almost completely blocked. A cathodic charge of +3.0 MC CM-2 was necessary for almost complete blocking.