Separator for non-aqueous secondary battery, making method, and non-aqueous electrolyte secondary battery

Abstract

A separator carries lithium particles on its surface. Using the separator, a non-aqueous electrolyte secondary battery having a high initial efficiency and improved cycle retentivity is available.

1 . A separator for non-aqueous secondary batteries, carrying a lithium powder on its surface.  
   
   
       2 . The separator of  claim 1  wherein said lithium powder is a surface stabilized metallic lithium powder.  
   
   
       3 . The separator of  claim 1  wherein a lithium powder having an adherent surface is bound to the separator.  
   
   
       4 . The separator of  claim 3  wherein the separator having the lithium powder bound thereto is obtained by applying an adherent lithium powder to a substrate having parting property, bringing the substrate in contact with a separator, and transferring the lithium powder to the separator.  
   
   
       5 . A non-aqueous electrolyte secondary battery comprising a separator according to  claim 1 .  
   
   
       6 . A non-aqueous electrolyte secondary battery comprising 
 a separator according to  claim 1 ,    a negative electrode comprising a negative electrode active material containing silicon and/or silicon oxide capable of intercalating and deintercalating lithium ions,    a positive electrode comprising a positive electrode active material containing a lithium composite oxide or sulfide capable of intercalating and deintercalating lithium ions, and    a non-aqueous electrolyte solution comprising a lithium salt.    
   
   
       7 . A method for preparing a separator carrying a lithium powder on its surface for non-aqueous secondary batteries, comprising the steps of applying an adherent lithium powder to a substrate having parting property, bringing the substrate in contact with a separator, and transferring the lithium powder to the separator.