{
  "$type": "site.standard.document",
  "description": "Hard carbon with sieving closed-pore structure and its preparation method are disclosed. Biomass mixture such as cotton, farm biowaste, or a mixture with 70-90% cellulose, 9-20% hemicellulose, and 1-10% lignin, etc., is applied as the raw material. This mixture is subjected to calcination at…",
  "path": "/patents/1381425",
  "publishedAt": "2026-04-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M4/583",
    "Qi Xue"
  ],
  "textContent": "Hard carbon with sieving closed-pore structure and its preparation method are disclosed. Biomass mixture such as cotton, farm biowaste, or a mixture with 70-90% cellulose, 9-20% hemicellulose, and 1-10% lignin, etc., is applied as the raw material. This mixture is subjected to calcination at temperatures ranging from 300 to 600° C., resulting in a pre-carbonized precursor. The precursor is then washed with an alkaline solution. Finally, the precursor undergoes a second calcination at a temperature between 900 to 1400° C. to yield the hard carbon product with sieving closed-pore structure.",
  "title": "Hard Carbon with Sieving Closed-pore Structure as Anode Material for Sodium-ion Battery"
}