Electrode and battery using the same

Abstract

An electrode in which an active material 11 or 7 , an electron conducting material 12 or a current collector 5 or 6 has PTC characteristics is used as at least one of positive and negative electrodes 1 and 2.

What is claimed is  
     
         1 . An electrode comprising: 
 an electrode active material layer containing an active material;    and an electronic conducting current collector on which the electrode active material layer are formed wherein said electrode active material layer has the property of increasing its resistance with a rise in temperature (PTC).    
     
     
         2 . The electrode according to  claim 1 , wherein said active material has the property of increasing its resistance with a rise in temperature (PTC).  
     
     
         3 . The electrode according to  claim 1 , wherein said electrode active material layer comprises an active material particle and an electronic conducting material, and the electronic conducting material has the property of increasing its resistance with a rise in temperature (PTC).  
     
     
         4 . The electrode according to  claim 1 , wherein said electrode active material layer is composed of an active region having an electrode activity and a non-active region having no electrode activity by which said active region is isolated into a plurality of parts, and said non active region has the property of increasing resistance with a rise in temperature.  
     
     
         5 . The electrode according to  claim 1 , wherein said electrode active material layer is composed of an active region having an electrode activity and a non-active region having no electrode activity by which said active region is isolated into a plurality of parts, and said active region has the property of increasing resistance with a rise in temperature.  
     
     
         6 . The electrode according to  claim 1 , wherein said active material is made up of secondary particles comprising a plurality of active material particles having adhered on the surface thereof electronic conducting particles having the property of increasing resistance with a rise in temperature.  
     
     
         7 . The electrode according to  claim 1 , wherein said electronic conducting current collector has the property of increasing its resistance with a rise in temperature (PTC).  
     
     
         8 . The electrode according to  claim 7 , wherein said electronic conducting current collector is composed of conductive plate to which an electronic conducting material having the property of increasing resistance with a rise in temperature is bonded.  
     
     
         9 . The electrode according to  claim 6 , wherein said electronic conducting material is a polymer having a softening point not higher than 150° C.  
     
     
         10 . A battery comprising: a positive electrode; a negative electrode; and an electrolysis held between said positive electrode and said negative electrode, wherein at least one of the positive electrode and negative electrode comprises an electrode active material layer containing an active material and an electronic conducting current collector on which the electrode active material layer are formed, and said electrode active material layer has the property of increasing its resistance with a rise in temperature (PTC).  
     
     
         11 . The battery according to  claim 10 , wherein said electrode active material layer is composed of an active region having an electrode activity and a non-active region having no electrode activity by which said active region is isolated into a plurality of parts, and said non active region has the property of increasing resistance with a rise in temperature.  
     
     
         12 . The battery according to  claim 10 , wherein said electrode active material layer is composed of an active region having an electrode activity and a non-active region having no electrode activity by which said active region is isolated into a plurality of parts, and said active region has the property of increasing resistance with a rise in temperature.  
     
     
         13 . The battery according to  claim 10 , wherein said active material in made up of secondary particles comprising a plurality of active material particles having adhered on the surface thereof electronic conducting particles having the property of increasing resistance with a rise in temperature.  
     
     
         14 . The battery according to  claim 10 , wherein said electronic conducting current collector has the property of increasing its resistance with a rise in temperature (PTC).  
     
     
         15 . The battery according to  claim 14 , wherein said electronic conducting current collector is composed of metal to which an electronic conducting material having the property of increasing resistance with a rise in temperature is bonded.  
     
     
         16 . The electrode according to  claim 13 , wherein said electronic conducting material is a polymer having a softening point not higher than 150° C.  
     
     
         17 . An electrode comprising: 
 an electrode active material layer containing an active material;    and an electronic conducting current collector on which the electrode active material layer are formed, 
 wherein said electronic conducting current collector has the property of increasing its resistance with a rise in temperature (PTC) electrode active material layer and  
 said electrode active material layer is made of an plurality of parts electrical isolated each other.  
   
     
     
         18 . The electrode according to  claim 17 , wherein said electronic conducting current collector is made of a conductive plate to which an electronic conducting material has the property of increasing its resistance with a rise in temperature (PTC) is bonded.  
     
     
         19 . A battery comprising: a positive electrode; a negative electrode; and an electrolysis held between said positive electrode and said negative electrode, 
 wherein at least one of the positive electrode and negative electrode comprises an electrode active material layer made of an plurality of parts electrical isolated each other and an electronic conducting current collector on which the electrode active material layer are formed,    and said electronic conducting current collector has the property of increasing its resistance with a rise in temperature (PTC).