Secondary cell electrode and fabrication method, and secondary cell, complex cell, and vehicle

Abstract

In a nonaqueous electrolyte cell-oriented electrode ( 10 ), an electrode active material layer ( 12 ) formed on a collector ( 1 ) has a density gradient developed with a gradient of a varied concentration of a solid along a thickness from a surface of the electrode active material layer ( 12 ) toward the collector ( 1 ), and in a gel electrolyte cell-oriented electrode ( 30 ), an electrode active material layer ( 32 ) formed on a collector ( 1 ) has a density gradient developed with (a) gradient(s) of (a) varied concentration(s) of one or both of an electrolyte salt and a film forming material along a thickness from a surface of the electrode active material layer ( 32 ) toward the collector ( 1 ).

1 . A fabrication method comprising fabricating a secondary cell electrode comprising an electrode active material layer having a density gradient. 
   
   
       2 . The fabrication method as claimed in  claim 1 , wherein the secondary cell electrode comprises a nonaqueous electrolyte cell-oriented electrode, comprising:
 (a) changing a quantity of a solid to be added to compose the electrode active material layer, thereby preparing a plurality of kinds of electrode slurry different in concentration of the solid; and   (b) coating a collector with the plurality of kinds of electrode slurry so that the density gradient is developed with a gradient of a concentration of the solid sequentially increased from a surface of the electrode active material layer toward the collector, thereby laminating a plurality of thin film layers different in concentration of the solid.   
   
   
       3 . The fabrication method as claimed in  claim 2 , wherein a thin film layer is coated by a thickness within a range of 1-100 μm in the step (b). 
   
   
       4 . The fabrication method as claimed in  claim 2 , wherein the electrode slurry is coated onto the collector by an ink jet method in the step (b). 
   
   
       5 . The fabrication method as claimed in  claim 4 , wherein the ink jet method employs a piezo system. 
   
   
       6 . The fabrication method as claimed in  claim 1 , wherein the secondary cell electrode comprises a gel electrolyte cell-oriented electrode, comprising:
 (a) changing a quantity of an electrolyte salt to be added to compose the electrode active material layer, thereby preparing a plurality of kinds of electrode slurry different in concentration of the electrolyte salt; and   (b) coating a collector with the plurality of kinds of electrode slurry so that the density gradient is developed with a gradient of a concentration of the electrolyte salt from a surface of the electrode active material layer toward the collector, thereby laminating a plurality of thin film layers different in concentration of the electrolyte salt.   
   
   
       7 . The fabrication method as claimed in  claim 1 , wherein the secondary cell electrode comprises a gel electrolyte cell-oriented electrode, comprising:
 (a) changing a quantity of a film forming raw material to be added to compose the electrode active material layer, thereby preparing a plurality of kinds of electrode slurry different in concentration of the film forming raw material; and   (b) coating a collector with the plurality of kinds of electrode slurry so that the density gradient is developed with a gradient of a concentration of the film forming raw material from a surface of the electrode active material layer toward the collector, thereby laminating a plurality of thin film layers different in concentration of the film forming raw material.   
   
   
       8 . The fabrication method as claimed in  claim 1 , wherein the secondary cell electrode comprises a gel electrolyte cell-oriented electrode, comprising:
 (a) changing quantities of an electrolyte salt and a film forming raw material to be added to compose the electrode active material layer, thereby preparing a plurality of kinds of electrode slurry different in concentrations of the electrolyte salt and the film forming raw material; and   (b) coating a collector with the plurality of kinds of electrode slurry so that the density gradient is developed with gradients of concentrations of the electrolyte salt and the film forming raw material from a surface of the electrode active material layer toward the collector, thereby laminating a plurality of thin film layers different in concentrations of the electrolyte salt and film forming raw material.   
   
   
       9 . The fabrication method as claimed in  claim 6 , wherein a thin film layer is coated by a thickness within a range of 1-100 μm in the step (b). 
   
   
       10 . The fabrication method as claimed in  claim 7 , wherein a thin film layer is coated by a thickness within a range of 1-100 μm in the step (b). 
   
   
       11 . The fabrication method as claimed in  claim 8 , wherein a thin film layer is coated by a thickness within a range of 1-100 μm in the step (b). 
   
   
       12 . The fabrication method as claimed in  claim 6 , wherein the electrode slurry is coated onto the collector by an ink jet method in the step (b). 
   
   
       13 . The fabrication method as claimed in  claim 7 , wherein the electrode slurry is coated onto the collector by an ink jet method in the step (b). 
   
   
       14 . The fabrication method as claimed in  claim 8 , wherein the electrode slurry is coated onto the collector by an ink jet method in the step (b). 
   
   
       15 . The fabrication method as claimed in  claim 12 , wherein the ink jet method employs a piezo system. 
   
   
       16 . The fabrication method as claimed in  claim 13 , wherein the ink jet method employs a piezo system. 
   
   
       17 . The fabrication method as claimed in  claim 14 , wherein the ink jet method employs a piezo system.