Power storage device electrode, method for manufacturing the same, power storage device, and electronic device

Abstract

To provide a highly reliable power storage device. To provide a long-life power storage device. To provide a power storage device electrode having high adhesion with a current collector. To reduce or inhibit electrochemical decomposition of an electrolytic solution or the like on a surface of an electrode. The power storage device electrode includes a current collector and a second electrode layer provided over the current collector and including a second binder and an active material. A first electrode layer including a first binder and conductive particles is provided between the current collector and the second electrode layer. At least part of a surface of the active material is provided with a coating film, and the coating film is porous.

What is claimed is: 
     
         1 . A power storage device electrode comprising:
 a current collector;   a first binder over the current collector; and   an electrode layer over the first binder, the electrode layer comprising a second binder, an active material, and a coating film including pores,   wherein at least part of a surface of the active material is provided with the coating film, and   wherein the current collector and the electrode layer are adhered to each other with the first binder.   
     
     
         2 . The power storage device electrode according to  claim 1 , wherein the coating film comprises silicon oxide comprising carbon and fluorine. 
     
     
         3 . The power storage device electrode according to  claim 1 , wherein the first binder comprises at least one of a carboxyl group, a carbonyl group, and a hydroxy group. 
     
     
         4 . The power storage device electrode according to  claim 1 , wherein the second binder comprises at least one of a carboxyl group, a carbonyl group, and a hydroxy group. 
     
     
         5 . A power storage device comprising the power storage device electrode according to  claim 1 , further comprising:
 an electrode; and   an electrolytic solution between the electrode and the power storage device electrode.   
     
     
         6 . A power storage device electrode comprising:
 a current collector;   a first electrode layer over the current collector, the first electrode layer comprising a first binder and a conductive particle; and   a second electrode layer over the first electrode layer, the second electrode layer comprising a second binder, an active material, and a coating film including pores,   wherein at least part of a surface of the active material is provided with the coating film, and   wherein the current collector and the second electrode layer are adhered to each other with the first binder.   
     
     
         7 . The power storage device electrode according to  claim 6 , wherein the conductive particle comprises carbon. 
     
     
         8 . The power storage device electrode according to  claim 6 ,
 wherein the coating film comprises silicon oxide comprising carbon and fluorine.   
     
     
         9 . The power storage device electrode according to  claim 6 , wherein the first binder comprises at least one of a carboxyl group, a carbonyl group, and a hydroxy group. 
     
     
         10 . The power storage device electrode according to  claim 6 , wherein the second binder comprises at least one of a carboxyl group, a carbonyl group, and a hydroxy group. 
     
     
         11 . The power storage device electrode according to  claim 6 , wherein a surface of the first electrode layer is uneven. 
     
     
         12 . The power storage device electrode according to  claim 6 , wherein the first electrode layer includes a first island-like region and a second island-like region. 
     
     
         13 . A power storage device comprising the power storage device electrode according to  claim 6 , further comprising:
 an electrode; and   an electrolytic solution between the electrode and the power storage device electrode.   
     
     
         14 . A method for manufacturing a power storage device electrode, comprising the steps of:
 forming a first electrode layer comprising a first binder and a conductive particle over a current collector; and   forming a second electrode layer comprising a second binder, an active material, and a coating film including pores over the current collector and the first electrode layer,   wherein the current collector and the second electrode layer are adhered to each other with the first binder.   
     
     
         15 . The method according to  claim 14 , wherein the conductive particle comprises carbon. 
     
     
         16 . The method according to  claim 14 , wherein the coating film comprises silicon oxide comprising carbon and fluorine. 
     
     
         17 . The method according to  claim 14 , wherein the first binder comprises at least one of a carboxyl group, a carbonyl group, and a hydroxy group. 
     
     
         18 . The method according to  claim 14 , wherein the second binder comprises at least one of a carboxyl group, a carbonyl group, and a hydroxy group. 
     
     
         19 . The method according to  claim 14 , wherein a surface of the first electrode layer is uneven. 
     
     
         20 . The method according to  claim 14 , wherein the first electrode layer includes a first island-like region and a second island-like region. 
     
     
         21 . A method for manufacturing a power storage device electrode, comprising the steps of:
 providing a first mixture comprising a first binder and a conductive particle over a current collector;   forming a second mixture comprising a second binder and an active material, the second binder comprising at least one of a carboxyl group, a carbonyl group, and a hydroxy group;   adding polysilazane to the second mixture to form a third mixture;   providing the third mixture over the current collector and the first mixture; and   baking the third mixture by heat treatment to form a coating film covering at least part of a surface of the active material.   
     
     
         22 . The method according to  claim 21 , wherein the polysilazane is hydrolyzed by the baking. 
     
     
         23 . The method according to  claim 21 , wherein the at least one of the carboxyl group, the carbonyl group, and the hydroxy group generates a gas by reacting with the polysilazane between formation of the third mixture and formation of the coating film. 
     
     
         24 . The method according to  claim 21 , wherein the conductive particle includes pores. 
     
     
         25 . The method according to  claim 21 , wherein the conductive particle comprises carbon. 
     
     
         26 . The method according to  claim 21 , wherein the coating film comprises silicon oxide comprising carbon and fluorine. 
     
     
         27 . The method according to  claim 21 , wherein the first binder comprises at least one of a carboxyl group, a carbonyl group, and a hydroxy group.