Patent ID: 6228536
Filing Date: 2001-05-08
Classification: H01M,Y02E,Y10T

Abstract:
A method of preparing a battery cell assembly, the method comprising preparing battery cell by steps of:providing a negative electrode, the step of providing the negative electrode including the steps ofproviding a negative-electrode active material that releases lithium ions upon discharging of the battery cell and accepts lithium ions upon charging of the battery cell, andproviding a negative current collector contacting the negative electrode active material, the step of providing the negative current collector including steps ofproviding a piece of a negative current collector metal, thereafer oxidizing the piece of the negative current collector metal, and thereafterreducing the piece of the negative current collector metal;providing a positive electrode comprisinga positive-electrode active material that accepts lithium ions upon discharging of the battery cell and releases lithium ions upon charging of the battery cell, anda positive current collector contacting the positive electrode active material;positioning a separator between the negative electrode and the positive electrode, the separator being electrically nonconductive to prevent contact between the negative electrode and the positive electrode but being permeable to lithium ions; andsaturating the electrodes and the separator with an electrolyte to provide a lithium ion path between the negative electrode and the positive electrode.