Electrode material for a polarized electrode

Abstract

The present invention provides polarized electrodes that ensure a satisfactory packing ratio of activated carbon particles and conductive particulates and favorable contact between these and an electrolyte, and demonstrate high capacitance. The present invention relates to the following electrode materials for polarized electrodes: (1) electrode materials for polarized electrodes containing a rubber-based emulsion, activated carbon particles, conductive particulates, and a surfactant; and (2) electrode materials for polarized electrodes containing a dispersion of polytetrafluoroethylene, activated carbon particles, conductive particulates, and a surfactant, wherein the solid content is 25% by weight or more.

1 . An electrode material for a polarized electrode, the electrode material comprising:
 a material prepared by:
 a first step of dispersing conductive particles and a surfactant in water; 
 a subsequent second step of dispersing activated carbon particles, different from the conductive particles, in the dispersion obtained in the first step; and 
 a third step of mixing a binder comprising rubber containing emulsion or a dispersion of polytetrafluoroethylene in the dispersion obtained in the second step. 
   
   
   
       2 . A polarized electrode obtained by forming an electrode layer on a conductive substrate using the electrode material for a polarized electrode of  claim 1 . 
   
   
       3 . An electrode material for a polarized electrode according to  claim 1 , containing a dispersion of polytetrafluoroethylene, activated carbon particles, conductive particulates, and a surfactant, wherein the solid content is 25% by weight or more. 
   
   
       4 . An electrode material for a polarized electrode according to  claim 1 , wherein a rubber component of the rubber-based emulsion is at least one member selected from the group consisting of butyl rubber, natural rubber, butadiene rubber, isoprene rubber, nitrile rubber, acrylic rubber, chloroprene rubber, ethylene-propylenediene rubber, styrene-butadiene rubber, and carboxy styrene-butadiene rubber.