초록 ▼

To obtain a lithium ion secondary battery having excellent charge and discharge characteristics in which electric connection between active material layers and a separator can be maintained without requiring a strong armor metal case, so that it can be made into thin forms having large energy densit

To obtain a lithium ion secondary battery having excellent charge and discharge characteristics in which electric connection between active material layers and a separator can be maintained without requiring a strong armor metal case, so that it can be made into thin forms having large energy density. Convex parts and concave parts are formed on at least two surfaces among surfaces of a positive electrode active material layer 7 and a negative electrode active material layer 9 both adjacent to a separator 4 and surfaces of the separator 4 facing both of the active material layers 7, 9, and these three means are bonded and closely adhered by an adhesive resin layer 11 and electrically connected by keeping a lithium ion-containing electrolytic solution in the separator 4 and voids 12 formed by a bonded surface 11a of the convex parts and the concave parts.

대표청구항 ▼

[ What is claimed is:] [1.] A lithium ion secondary battery comprising:a positive electrode active material layer bonded to a positive electrode collector;a negative electrode active material layer bonded to a negative electrode collector;a separator which has surfaces facing respective surfaces of

[ What is claimed is:] [1.] A lithium ion secondary battery comprising:a positive electrode active material layer bonded to a positive electrode collector;a negative electrode active material layer bonded to a negative electrode collector;a separator which has surfaces facing respective surfaces of said active material layers; anda lithium ion-containing electrolytic solution kept within said separator, said active material layers and therebetween,wherein convex and concave parts are formed on at least one of the facing surfaces of said positive active material layer and said separator, and at least one of the facing surfaces of said negative material layer and said separator, and two pairs of said facing surfaces are bonded by an adhesive resin layer respectively, so that voids having a predetermined depth are formed by a bonded surface of said convex parts and said concave parts, and the lithium ion-containing electrolytic solution is kept in the voids.