{
  "$type": "site.standard.document",
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  "description": "A nonaqueous electrolyte secondary battery includes an electrode group (8) formed by winding a positive electrode (4) and a negative electrode (5) with a porous insulating layer (6) interposed therebetween. The positive electrode (4) includes a positive electrode material mixture layer (4B) and a…",
  "path": "/patents/1007399",
  "publishedAt": "2011-12-07T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M10/0431",
    "PANASONIC CORP [JP]"
  ],
  "textContent": "A nonaqueous electrolyte secondary battery includes an electrode group (8) formed by winding a positive electrode (4) and a negative electrode (5) with a porous insulating layer (6) interposed therebetween. The positive electrode (4) includes a positive electrode material mixture layer (4B) and a positive electrode current collector (4A). The positive electrode material mixture layer (4B) has a porosity of 20% or lower. ε ≥ η/ρ is satisfied, where η is the thickness of the positive electrode material mixture layer (4B) on a surface located inside in the radial direction of the electrode group (8) of surfaces of the positive electrode current collector (4A), ρ is the minimum radius of curvature of the positive electrode (4), and ε is a tensile extension in the winding direction of the positive electrode (4). The frequency distribution curve for the particle sizes of a positive electrode active material has two or more peaks.",
  "title": "NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND MANUFACTURING METHOD THEREOF"
}