{
  "$type": "site.standard.document",
  "description": "The present invention intends to provide a lithium ion secondary battery that has a high capacity and excellent charge/discharge cycle characteristics. A lithium ion secondary battery includes: a positive electrode; and a negative electrode, wherein the negative electrode includes a negative…",
  "path": "/patents/981728",
  "publishedAt": "2013-11-20T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M10/0525",
    "SHINETSU CHEMICAL CO [JP]"
  ],
  "textContent": "The present invention intends to provide a lithium ion secondary battery that has a high capacity and excellent charge/discharge cycle characteristics. A lithium ion secondary battery includes: a positive electrode; and a negative electrode, wherein the negative electrode includes a negative electrode active material of which initial charge capacity is 1800 mAh/g or more and initial efficiency (initial discharge capacity/initial charge capacity) is 0.70 to 0.85, the positive electrode includes a positive electrode active material of which initial charge capacity is 160 mAh/g or more and initial efficiency (initial discharge capacity/initial charge capacity) is 0.75 to 0.90, and an initial discharge capacity ratio of the negative electrode and the positive electrode (initial discharge capacity of the negative electrode/initial discharge capacity of the positive electrode) is 0.90 to 1.30.",
  "title": "Lithium ion secondary battery"
}