{
  "patent_number": "US 12266789",
  "country": "US",
  "title": "How to Make Lithium-Sulfur Batteries Last Longer Using Polymer Coatings",
  "original_title": "Positive electrode active material for lithium-sulfur battery, preparation method thereof and lithium-sulfur battery comprising same",
  "summary": "A new way to coat sulfur battery cores with a special polymer to prevent them from degrading, helping them hold a charge for more cycles.",
  "what_it_does": "This patent describes a way to improve lithium-sulfur batteries by wrapping the sulfur-based core of the battery's positive electrode in a protective shell. The shell is made of a specific material called a polythiophene acetic acid-polyethylene glycol graft copolymer. This shell acts like a sponge that traps lithium polysulfides, which are chemical byproducts that usually leak out and kill the battery's performance. By keeping these chemicals locked inside the shell, the battery stays efficient and lasts through more charge-discharge cycles.",
  "what_it_does_not_cover": [
    "Does not cover batteries that do not use a core-shell structure for the active material.",
    "Does not cover batteries using shell materials other than the specific polythiophene acetic acid-polyethylene glycol graft copolymer.",
    "Does not cover standard lithium-ion batteries that use metal oxides instead of sulfur compounds in the positive electrode."
  ],
  "filed": "2021-08-04",
  "granted": "2025-04-01",
  "expires": null,
  "status": "active",
  "holder": "Seoul National University R&DB Foundation",
  "holder_url": "https://patentbrief.org/company/seoul-national-university-rdb-foundation",
  "inventors": [
    {
      "name": "Chan Yeong KOONG",
      "url": "https://patentbrief.org/inventor/chan-yeong-koong"
    },
    {
      "name": "Kwonnam Sohn",
      "url": "https://patentbrief.org/inventor/kwonnam-sohn"
    },
    {
      "name": "Jong-Chan Lee",
      "url": "https://patentbrief.org/inventor/jong-chan-lee"
    },
    {
      "name": "Soohyun KIM",
      "url": "https://patentbrief.org/inventor/soohyun-kim"
    },
    {
      "name": "Kihyun Kim",
      "url": "https://patentbrief.org/inventor/kihyun-kim"
    },
    {
      "name": "Daun JEONG",
      "url": "https://patentbrief.org/inventor/daun-jeong"
    }
  ],
  "times_cited": 0,
  "tags": [
    "energy",
    "materials",
    "semiconductors"
  ],
  "abstract": "The present disclosure relates to a positive electrode active material, a preparation method thereof, and a lithium-sulfur battery including the same, more particularly to a positive electrode active material including a particulate structure of a core-shell structure which comprises a core part and a shell part covering the whole surface or a part of the surface of the core part, wherein the core part comprises a sulfur compound, and the shell part comprises a polythiophene acetic acid-polyethylene glycol graft copolymer. The positive electrode active material of the present disclosure has excellent electrochemical reactivity and adsorbs lithium polysulfide to improve capacity and lifetime characteristics of the lithium-sulfur battery.",
  "url": "https://patentbrief.org/patent/us/12266789/merlin-engine",
  "markdown_url": "https://patentbrief.org/patent/us/12266789/merlin-engine/md",
  "google_patents_url": "https://patents.google.com/patent/US12266789",
  "relatedPatents": []
}