Electrochemical cell and electrochemical capacitor

Abstract

An electrochemical cell includes a positive electrode, a negative electrode, and an electrolyte solution. The positive electrode and/or the negative electrode includes a penetrating portion that penetrates the electrodes in the thickness direction. Further, an electrochemical capacitor includes a positive electrode, a negative electrode, and an electrolyte solution. In a plane of projection in which a region carrying a negative electrode active material of the negative electrode is projected onto a region carrying a positive electrode active material of the positive electrode along a opposed direction, the ratio of an area carrying the positive electrode active material to an area carrying the negative electrode active material is less than 1.

1 .- 6 . (canceled) 
     
     
         7 . An electrochemical capacitor comprising a positive electrode carrying a positive electrode active material containing a polarizable carbon material;
 a negative electrode carrying a negative electrode active material containing a material which is capable of reversibly adsorbing/desorbing lithium ions and is arranged so that the negative electrode active material is opposed to the positive electrode active material; and   an electrolyte solution containing an organic solvent containing a lithium salt in which the positive electrode and the negative electrode are immersed; wherein in a plane of projection in which a region carrying the negative electrode active material is projected onto a region carrying the positive electrode active material along an opposed direction,   the ratio of an area carrying the positive electrode active material to an area carrying the negative electrode active material is less than 1.   
     
     
         8 . The electrochemical capacitor according to  claim 7 , wherein
 in a plane of projection in which a region carrying the positive electrode active material is projected onto a region carrying the negative electrode active material along the opposed direction,   the region carrying the positive electrode active material is totally included in the region carrying the negative electrode active material.   
     
     
         9 . The electrochemical capacitor according to  claim 7 , wherein the ratio of an area carrying the positive electrode active material to an area carrying the negative electrode active material is not less than 0.6. 
     
     
         10 . The electrochemical capacitor according to  claim 7 , wherein the positive electrode active material contains KOH-activated soft carbon. 
     
     
         11 . The electrochemical capacitor according to  claim 7 , wherein a potential of the positive electrode is not less than 4.23 V vs. Li/Li + . 
     
     
         12 . The electrochemical capacitor according to  claim 7 , containing a scavenger which traps a negative electrode activity inhibitor that is derived from anions contained in the electrolyte solution at least any of between the positive electrode and the negative electrode, inside of the positive electrode and inside of the positive electrode.