RESEARCH OF CHARGE TRANSFER IN LITHIUM CORROSION FILMS FORMED IN LiClO4 SOLUTIONS IN PC/DME MIXTURE

Abstract

The use of lithium metal as an anode for lithium-ion batteries is of particular interest due to its high capacity, which is an order of magnitude higher than the capacity of commercial carbon materials. However, the problem of lithium dendritic formation during cycling is the main problem preventing this. A full understanding of the mechanism of this process would create ways to solve this problem. In this work, the charge transfer processes in lithium corrosion films in a 1M LiClO4 electrolyte in a PC / DME mixture were studied by analyzing the polarization curves on lithium at different times of electrode exposure in the electrolyte. The studies were carried out by the method of micropolarization, which is a voltammetric measurement of short action in a three-electrode electrochemical cell in thermostatically controlled conditions. It was found that with micropolarization the current-voltage characteristic is almost linear and characterizes Ohm's law. At significant polarization intervals and at different potential scan rates, the polarization curves in 1M LiClO4 electrolyte in PC / DME are well approximated by the Butler-Volmer equation. Moreover, the obtained values of the Tafel coefficient of 58 mV completely confirm the charge transfer through the interface, as a limiting stage.

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