{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "The inventive negative electrode for the electrochemical element includes a negative electrode composition layer provided on at least one surface of a current collector made of a metal foil; in which the negative electrode composition layer includes material S comprising Si and a…",
  "path": "/patents/1281785",
  "publishedAt": "2021-01-21T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M4/364",
    "MAXELL HOLDINGS, LTD."
  ],
  "textContent": "The inventive negative electrode for the electrochemical element includes a negative electrode composition layer provided on at least one surface of a current collector made of a metal foil; in which the negative electrode composition layer includes material S comprising Si and a hardly-graphitizable carbon material as a negative electrode active material; in which assuming that the whole amount of the negative electrode active material contained in the negative electrode composition layer is 100 mass %, a ratio of the material S is 50 to 90 mass % and a ratio of the hardly-graphitizable carbon materials is 10 to 50 mass %. The inventive lithium ion secondary battery includes a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte liquid, and the negative electrode is constituted by the negative electrode for the electrochemical element of the present invention.",
  "title": "NEGATIVE ELECTRODE FOR ELECTROCHEMICAL ELEMENT AND A LITHIUM ION SECONDARY BATTERY"
}