{
  "$type": "site.standard.document",
  "description": "A positive electrode active material comprising a plurality of secondary particles, wherein: each of the secondary particles includes a plurality of primary particles; each of the primary particles contains an olivine-type phosphate compound; carbon is attached to at least part of a surface of the…",
  "path": "/patents/1426621",
  "publishedAt": "2026-06-25T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M4/5825",
    "TOYOTA JIDOSHA KABUSHIKI KAISHA"
  ],
  "textContent": "A positive electrode active material comprising a plurality of secondary particles, wherein: each of the secondary particles includes a plurality of primary particles; each of the primary particles contains an olivine-type phosphate compound; carbon is attached to at least part of a surface of the primary particle; a cross-sectional surface of the secondary particle includes a central portion and a peripheral portion; and a relationship of 0.5≤I/Iis satisfied where Iis an average value of signal intensities of carbon in the central portion in TEM-EDS line analysis along a diametrical direction of the secondary particle, and Iis an average value of signal intensities of carbon in the peripheral portion in TEM-EDS line analysis along the diametrical direction of the secondary particle.",
  "title": "POSITIVE ELECTRODE ACTIVE MATERIAL, BATTERY, AND METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL"
}