×

NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING THE SAME

  • US 20120052393A1
  • Filed: 09/23/2011
  • Published: 03/01/2012
  • Est. Priority Date: 03/27/2009
  • Status: Active Grant
First Claim
Patent Images

1. A negative electrode material for nonaqueous electrolyte secondary battery, comprising the following carbon material A and carbon material B:

  • (Carbon material A)a multilayer-structure carbon material containing a graphitic particle and an amorphous carbon covering the surface of the graphitic particle, which is a carbon material where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å

    or less, Lc is 900 Å

    or more, the tap density is 0.8 g/cm3 or more, and the Raman R value that is a ratio of the peak intensity near 1,360 cm

    1
    to the peak intensity near 1,580 cm

    1
    in the argon ion laser Raman spectrum, is from 0.25 to 0.6,(Carbon Material B)a graphitic particle where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å

    or less, Lc is 900 Å

    or more, the tap density is 0.8 g/cm3 or more, the Raman R value that is a ratio of the peak intensity near 1,360 cm

    1
    to the peak intensity near 1,580 cm

    1
    in the argon ion laser Raman spectrum, is from 0.2 to 0.5, and the average degree of circularity as determined by a flow-type particle analyzer is 0.9 or more.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×