{
  "$type": "site.standard.document",
  "description": "The present invention provides a mixed carbon material which comprises carbon material A and carbon material B and which is a carbon material suitable for a negative electrode material which can provide a nonaqueous secondary battery having a low irreversible capacity and having a negative…",
  "path": "/patents/1005439",
  "publishedAt": "2012-02-08T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "C01B32/05",
    "SUMITOMO METAL IND [JP]"
  ],
  "textContent": "The present invention provides a mixed carbon material which comprises carbon material A and carbon material B and which is a carbon material suitable for a negative electrode material which can provide a nonaqueous secondary battery having a low irreversible capacity and having a negative electrode with a high capacity and high charge acceptance. Carbon material A and carbon material B both have cores made of graphite powder and a surface carbon material in the form of at least one of amorphous carbon and turbostratic carbon adhered to or coated on at least a portion of the surface of the graphite powder. The compressed density is 1.80 - 1.90 g/cm 3 for carbon material A alone, 1.45 - 1.65 g/cm 3 for carbon material B alone, and 1.75 - 1.84 g/cm 3 for the mixed carbon material. The average particle diameter of carbon material B is at most 14 µm and is smaller than the average particle diameter of carbon material A. The specific surface areas of carbon material A and carbon material B are at most 4 m 2 /g and at most 6 m 2 /g, respectively.",
  "title": "MIXED CARBON MATERIAL AND NEGATIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY"
}