Patent ID: 11961973
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. An all-solid-state secondary battery comprising a positive electrode collector layer, a positive electrode layer, a solid electrolyte layer, a negative electrode layer and a negative electrode collector layer stacked in that order, wherein:
the positive electrode layer has a positive electrode active material layer and an insulating layer disposed around perimeter edges of the positive electrode active material layer, and
when the all-solid-state secondary battery is viewed from a stacking direction,
outer edges of the positive electrode active material layer on solid electrolyte layer side are further inward than outer edges of the positive electrode active material layer on positive electrode collector layer side, and, outer edges of the positive electrode collector layer are further inward than the outer edges of the positive electrode active material layer on the positive electrode collector layer side, wherein in an arbitrary cross-section in the stacking direction of the all-solid-state secondary battery, with:
x mm denoting a shortest distance in the direction of a plane formed by an extension of the positive electrode active material layer on the positive electrode collector layer side and an extension of the positive electrode collector layer, and
y mm denoting a shortest distance in the direction of a plane formed by an extension of the positive electrode active material layer on the positive electrode collector layer side and an extension of the positive electrode active material layer on the solid electrolyte layer side, the following inequality (1) is satisfied:, Electron
          ⁢
          
            
          
          ⁢
          conductivity
          ⁢
          
            
          
          ⁢
          of
          ⁢
          
            
          
          ⁢
          positive
          ⁢
          
            
          
          ⁢
          electrode
          ⁢
          
            
          
          ⁢
          active
          ⁢
          
            
          
          ⁢
          material
          ⁢
          
            
          
          ⁢
          layer
          ⁢
          
            
          
          ⁢
          
            (
            
              mS
              ⁢
              
                /
              
              ⁢
              cm
            
            )
          
          ×
          
            (
            
              x
              -
              y
            
            )
          
          ⁢
          
            /
          
          ⁢
          lithium
          ⁢
          
            
          
          ⁢
          ion
          ⁢
          
            
          
          ⁢
          conductivity
          ⁢
          
            
          
          ⁢
          of
          ⁢
          
            
          
          ⁢
          positive
          ⁢
          
            
          
          ⁢
          electrode
          ⁢
          
            
          
          ⁢
          active
          ⁢
          
            
          
          ⁢
          material
          ⁢
          
            
          
          ⁢
          layer
          ⁢
          
            
          
          ⁢
          
            (
            
              mS
              ⁢
              
                /
              
              ⁢
              cm
            
            )
          
        
        ≤
        450.0
      
    
    
      
        (
        1
        )
      
    
  

(where x>0.0, y>0.0 and x−y>0.0).