{
  "$type": "site.standard.document",
  "description": "A positive electrode active material with high charge and discharge capacity is provided. A positive electrode active material with high charge and discharge voltage is provided. A secondary battery which hardly deteriorates is provided. A highly safe power storage device is provided. A novel…",
  "path": "/patents/1380808",
  "publishedAt": "2026-04-09T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M4/485",
    "SEMICONDUCTOR ENERGY LABORATORY CO., LTD."
  ],
  "textContent": "A positive electrode active material with high charge and discharge capacity is provided. A positive electrode active material with high charge and discharge voltage is provided. A secondary battery which hardly deteriorates is provided. A highly safe power storage device is provided. A novel secondary battery is provided. The positive electrode active material contains cobalt, oxygen, and fluorine and includes a bond of the cobalt and the fluorine in a surface portion or the vicinity of a grain boundary. By having the bond with fluorine, at least part of cobalt is high-spin (paramagnetic) Co. Thus, in ESR analysis, the spin concentration at 113 K is higher than the spin concentration at 300 K by 1.1×10spins/g or more.",
  "title": "POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE, SECONDARY BATTERY, ELECTRONIC DEVICE, AND VEHICLE"
}