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Secondary battery

  • US 6,207,326 B1
  • Filed: 11/26/1997
  • Issued: 03/27/2001
  • Est. Priority Date: 11/30/1992
  • Status: Expired due to Term
First Claim
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1. A secondary battery having a negative electrode substantially made of a negative electrode active material, a positive electrode substantially made of a positive electrode active material and an electrolyte or an electrolytic solution held between said negative electrode and said positive electrode, wherein said negative electrode and said positive electrode are arranged opposite and are separated by a separator;

  • andwherein at least the surface of said negative electrode includes nitrogen atoms or halogen atoms and the concentration of those are gradually lowered from the surface to the inside portion of said negative electrode.

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