FLAT, BONDED-ELECTRODE RECHARGEABLE ELECTROCHEMICAL CELL ANDMETHOD OF MAKING

摘要

A Li-ion battery cell comprising a polymeric matrix positive electrode layer member, a polymeric matrix negative electrode layer member, and an interpose d microporous polyolefin separator layer member is laminated into a unitary, flexible cell structure by means of heat and pressure without necessity of aplied interlayer adhesive. A volatile vehicle solution of a primary plasticizer for the electrode member polymer matrix is applied to the microporous separator member where it is absorbed into the porous structure. Evaporation of the volatile vehicle solvent deposits the plasticizer upon an d within the pores of the separator member. During the lamination operation th e plasticizer is forced into contact with the electrode member polymer where i t softens the polymer into a thermoplastic adhesive in the region of the electrode/separator interface, thereby enabling the electrode polymer alone to form a strong bond to the separator upon cooling.