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Negative electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte socondary battery

  • US 20040115535A1
  • Filed: 09/23/2003
  • Published: 06/17/2004
  • Est. Priority Date: 09/26/2002
  • Status: Active Grant
First Claim
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1. A nonaqueous electrolyte secondary battery comprising:

  • a positive electrode;

    a negative electrode containing a negative electrode active material including carbonaceous particles and a Si phase dispersed in the carbonaceous particles; and

    a nonaqueous electrolyte;

    wherein the negative electrode active material is 1.5°

    or more and 8°

    or less in a half width of a diffraction peak derived from (220) plane of silicon in powder X-ray diffraction, and an average size of the Si phase is less than 100 nm.

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