Lithium ion secondary battery and preparation process of same

Abstract

A separator-type lithium ion secondary battery having large capacity and excellent charge-discharge performance without destroying the separator, even if an active material layer having concavo-convex structure of high aspect ratio is provided. The lithium ion secondary battery comprises a first electrode comprising a first current collector□ and a first active material layer formed by a plural of convex first active material parts which is provided on the first current collector, a second electrode comprising a second current collector□ and a second active material layer formed by a plural of convex second active material parts which is provided on the second current collector, and a separator provided between the first electrode and the second electrode, wherein the first electrode and the second electrode are integrated so that the convex first active material part is faced between the adjacent convex second active material parts, and the convex first active material part does not inter between the convex second active material parts.

What is claimed is: 
     
         1 . A lithium ion secondary battery, comprising
 a first electrode comprising a first current collector, and a plural of convex linear first active material parts provided approximately parallel to each other on a surface of the first current collector,   a second electrode comprising a second current collector, and a plural of convex linear second active material parts provided approximately parallel to each other on a surface of the second current collector, and   a separator provided between the first electrode and the second electrode,   wherein the first electrode and the second electrode are integrated so that the linear first active material parts and the linear second active material parts are provided in the opposed manner, and   the first electrode and the second electrode are integrated in such a position that the linear first active material part crosses to the linear second active material part in the approximately vertical view to the surfaces of the first current collector and the second current collector.   
     
     
         2 . The lithium ion secondary battery of  claim 1 , wherein the first electrode and the second electrode are integrated in such a position that the linear first active material part crosses to a plural of the linear second active material parts in the approximately vertical view to the surfaces of the first current collector and the second current collector. 
     
     
         3 . The lithium ion secondary battery of  claim 1 , wherein the first electrode and the second electrode are integrated in such a position that the linear first active material part is orthogonalized with the linear second active material part in the approximately vertical view to the surfaces of the first current collector and the second current collector. 
     
     
         4 . A process of manufacturing a lithium ion secondary battery comprising steps of:
 a first electrode forming step where a first electrode is obtained by forming a plural of convex linear first active material parts which are approximately parallel to each other on a surface of a first current collector,   a second electrode forming step where a second electrode is obtained by forming a plural of convex linear second active material parts which are approximately parallel to each other on a surface of a second current collector, and   an integrated article forming step where an integrated article is obtained by integrating the first electrode and the second electrode so that the first active material parts are faced to the second active material parts via a separator,   wherein in said integrated article forming step, the first electrode and the second electrode are integrated in such a position that the linear first active material part crosses to the linear second active material part in the approximately vertical view to the surfaces of the first current collector and the second current collector.   
     
     
         5 . The process of manufacturing a lithium ion secondary battery of  claim 4 , wherein in the integrated article forming step, the first electrode and the second electrode are integrated in such a position that the linear first active material part crosses to a plural of the linear second active material parts in the approximately vertical view to the surfaces of the first current collector and the second current collector. 
     
     
         6 . The process of manufacturing a lithium ion secondary battery of  claim 4 , wherein in the integrated article forming step, the first electrode and the second electrode are integrated in such a position that the linear first active material part is orthogonalized with the linear second active material part in the approximately vertical view to the surfaces of the first current collector and the second current collector.