Patent ID: 6045937
Filing Date: 2000-04-04
Classification: H01M,Y02E,Y02P

Abstract:
An electrochemical cell having a controlled electrode surface comprising:a first electrode and a second electrode wherein at least one of the first and second electrodes includes a carbonaceous surface;an electrolyte including at least one solvent;a reduced additive associated with the carbonaceous surface of at least one of the first and second electrodes, wherein the reduced additive is at least one of substantially insoluble in the electrolyte or associated with the carbonaceous surface of the electrode, and, wherein the reduced additive includes an additive which is either soluble or insoluble in the electrolyte prior to reduction;passivating means including at least one of the additive and reduced additive for substantially precluding contact between the at least one solvent of the electrolyte and the carbonaceous surface of at least one of the first and second electrodes to, in turn, substantially prevent gas formation within the cell, which would otherwise result from decomposition of the solvent upon contact with the carbonaceous surface; andmeans associated with at least one of the additive and reduced additive for substantially precluding gas formation within the electrochemical cell as a result of decomposition of the additive or reduced additive at the electrode with the carbonaceous surface during cell cycling and storage.