{
  "$type": "site.standard.document",
  "description": "Provided is a negative electrode active material which is excellent in capacity, capacity retention ratio, and a coulombic efficiency when charging/discharging is repeated. The chemical composition of the alloy particles of the negative electrode active material of the present disclosure includes…",
  "path": "/patents/1313301",
  "publishedAt": "2022-03-17T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M4/38",
    "NIPPON STEEL CORPORATION"
  ],
  "textContent": "Provided is a negative electrode active material which is excellent in capacity, capacity retention ratio, and a coulombic efficiency when charging/discharging is repeated. The chemical composition of the alloy particles of the negative electrode active material of the present disclosure includes 0.50 to 3.00 mass % of oxygen, and alloy elements containing Sn: 13.0 to 40.0 at % and Si: 6.0 to 40.0 at %, with the balance being Cu and impurities. The structure of the alloy particles includes: one or more types selected from the group consisting of a phase having a D0structure, and a δ phase; one or more types selected from the group consisting of an ε phase and an η′ phase; and a SiOphase (x=0.50 to 1.70). The SiOphase (x=0.50 to 1.70) has a volume fraction of 5.0 to 60.0% and the η′ phase has a volume fraction of 0 to 60.0%.",
  "title": "NEGATIVE ELECTRODE ACTIVE MATERIAL, NEGATIVE ELECTRODE, AND BATTERY"
}