Patent ID: 6217623
Filing Date: 2001-04-17
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
A method of making a rechargeable electrochemical cell including first and second electrodes, and a porous separator element having first and second major sides, said method comprising the steps of:(a) providing a mixture comprising an electroactive material, a polymeric binder and a solvent;(b) transferring said mixture into a pressure vessel;(c) introducing a gas into the pressure vessel;(d) adjusting the pressure and temperature inside of the pressure vessel, such that the gas reaches a critical point at which the gas behaves like a supercritical fluid;(e) spraying at least one of the lectrodes or the separator element with said mixture;(f) disposing said first and second electrodes on opposite sides of said separator element; and(g) sealing said first and second electrodes and said separator element in a liquid and vapor impermeable package;wherein the step of spraying further comprises spraying only the separator element with said mixture.