Patent ID: 6291102
Filing Date: 2001-09-18
Classification: H01M,Y02E,Y02P

Abstract:
A lithium ion secondary battery comprising a plurality of electrode laminates each having a positive electrode comprising a particulate positive electrode active material bound to a positive electrode current collector by a binder resin, a negative electrode comprising a particulate negative electrode active material bound to a negative electrode current collector by a binder resin, a separator which is interposed between the positive electrode and the negative electrode and joined to the positive and the negative electrode active material layers with a binder resin, and the positive and the negative electrode active material layers and the separator hold a lithium ion-containing electrolytic solution in their voids, wherein the positive and negative electrode active material particles near the separator are covered with a larger amount of binder resin than the positive and negative electrode active material particles near the positive or negative electrode current collectors, thereby providing a joint strength between the separator and the positive and the negative electrode active material layers which is equal to or greater than the joint strength between the positive and the negative electrode active material layers and the respective current collectors.