{
  "$type": "site.standard.document",
  "description": "The invention provides a negative electrode material for a lithium ion secondary battery, including a composite particle of a first particle containing a carbonic substance A and a second particle containing silicon, which are combined with a carbonic substance B, wherein, when a cross-section of…",
  "path": "/patents/983303",
  "publishedAt": "2013-10-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M4/36",
    "HITACHI CHEMICAL CO LTD [JP]"
  ],
  "textContent": "The invention provides a negative electrode material for a lithium ion secondary battery, including a composite particle of a first particle containing a carbonic substance A and a second particle containing silicon, which are combined with a carbonic substance B, wherein, when a cross-section of the composite particle is observed with respect to: the content of silicon atom in a core region in a circle having a center thereof on the midpoint of the major axis, which constitutes the maximum length, and having a radius of 1/8 of the length of the minor axis orthogonally intersecting the major axis at the midpoint thereof, and the content of silicon atom in a rim region which extends from a circumference of the composite particle to a depth of 1/8 of the length of the minor axis, the ratio of the content in the rim region to the content in the core region is 2 or higher. A production method, and a negative electrode for a lithium ion secondary battery containing the negative electrode material, as well as a lithium ion secondary battery are provided.",
  "title": "NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, METHOD FOR MANUFACTURING SAME, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY"
}