US 5,981,107 A · Lithium ion secondary battery and method of fabricating thereof

Abstract

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.

Claims20

Dependent claims

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;
and
a 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.

3 more elements

A method of fabricating a lithium ion secondary battery, comprising steps of:

adhering a positive electrode active material layer to a positive electrode collector;
adhering a negative electrode active material layer to a negative electrode collector;
forming convex parts and concave parts on at least one of a surface of the positive electrode active material layer and a surface of the separator facing to the positive electrode active material layer, and on at least one of a surface of the negative electrode active material layer and a surface of the separator facing to the negative electrode active material layer;
adhering the adhesive resin layer to at least one of the surface of the positive electrode active material layer and the facing surface of the separator and to at least one of the surface of the negative electrode active material layer and the facing surface of the separator;
fitting one surface of the positive electrode active material layer and one surface of the negative electrode active material layer upon respective surfaces of said separator to form voids having a predetermined depth by a bonded surface of said convex parts and concave parts to form a laminated body;
and
supplying a lithium ion-containing electrolytic solution into said separator, said active material layers and therebetween including the voids.

4 more elements

Dependencies are inferred from the claim text.

Lithium ion secondary battery and method of fabricating thereof

Life of this patent

Lithium ion secondary battery and method of fabricating thereof

Life of this patent

Abstract

Claims20