{
  "patent_number": "US 11271251",
  "country": "US",
  "title": "How a Two-Layer Coating Protects Lithium Battery Anodes",
  "original_title": "Battery cell with anode protective layer",
  "summary": "This patent describes a lithium battery cell design that uses two special protective layers on the anode to stop harmful growths called dendrites and make the battery last longer and work better, especially in solid-state batteries.",
  "what_it_does": "This patent describes a specific design for a lithium battery cell, focusing on its anode. The anode has an \"anode current collector\" (like a metal sheet) covered by two distinct \"ad-layers\" (thin coatings). The first ad-layer sits directly on the current collector and is designed to let lithium ions pass through while blocking electrical current, using materials like amorphous carbon or graphene oxide (Claim 1). The second ad-layer, which is also conductive to lithium ions, acts as a protective shield, often made from metal oxide or nitride derivatives (Claim 2). These layers work together to prevent \"dendrites,\" which are tiny, tree-like metal growths that can damage the battery and cause it to fail. For example, a battery built with these layers could maintain over 99.9% \"coulombic efficiency\" for 2000 charge/discharge cycles (Claim 13).",
  "what_it_does_not_cover": [
    "Battery cells that do not include both a first ad-layer that is electrically insulating and a second ad-layer that is a protective layer, as described in Claim 1.",
    "Anode protective layers that are not conductive to lithium ions, as both the first and second ad-layers are specified to be (Claim 1).",
    "Battery cells using liquid electrolytes, as the separator is specified to be a solid polymer, ceramic, or a combination thereof (Claim 1).",
    "Protective layers made from materials outside the specific groups listed for the first ad-layer (amorphous carbon, boron nitride, graphene oxide) or the second ad-layer (metal oxide, nitride, phosphide derivatives) (Claim 1, 2).",
    "Battery designs where the protective layers are not positioned between the anode current collector and the solid-state separator."
  ],
  "filed": "2018-06-07",
  "granted": "2022-03-08",
  "expires": "2038-06-07",
  "status": "active",
  "holder": "Robert Bosch",
  "holder_url": "https://patentbrief.org/company/robert-bosch",
  "inventors": [
    {
      "name": "Ram Subbaraman",
      "url": "https://patentbrief.org/inventor/ram-subbaraman"
    },
    {
      "name": "Sondra Hellstrom",
      "url": "https://patentbrief.org/inventor/sondra-hellstrom"
    },
    {
      "name": "Abdul-Kader Srouji",
      "url": "https://patentbrief.org/inventor/abdul-kader-srouji"
    },
    {
      "name": "Ingo KERKAMM",
      "url": "https://patentbrief.org/inventor/ingo-kerkamm"
    },
    {
      "name": "John F. Christensen",
      "url": "https://patentbrief.org/inventor/john-f-christensen"
    }
  ],
  "times_cited": 0,
  "tags": [
    "consumer_electronics",
    "automotive",
    "energy",
    "materials",
    "semiconductors"
  ],
  "abstract": "A lithium battery cell having one or more protective layers between the anode current collector and a solid state separator. The protective layers prevent dendrite propagation through the battery cell and improve coulombic efficiency by reducing deleterious side reactions.",
  "url": "https://patentbrief.org/patent/us/11271251/battery-cell-with-anode-protective-layer",
  "markdown_url": "https://patentbrief.org/patent/us/11271251/battery-cell-with-anode-protective-layer/md",
  "google_patents_url": "https://patents.google.com/patent/US11271251",
  "relatedPatents": [
    {
      "patentNumber": "10566652",
      "countryCode": "US",
      "title": "How a Hybrid Layer Stops Metal Growths in Lithium Batteries",
      "url": "https://patentbrief.org/patent/us/10566652/lithium-metal-battery-with-hybrid-electrolyte-system"
    },
    {
      "patentNumber": "11145922",
      "countryCode": "US",
      "title": "Boosting Solid-State Batteries with a Capacitor Interlayer",
      "url": "https://patentbrief.org/patent/us/11145922/solid-state-battery-having-a-capacitor-assisted-interlayer"
    },
    {
      "patentNumber": "10593988",
      "countryCode": "US",
      "title": "Improving Lithium Battery Life with a Built-in Lithium Source",
      "url": "https://patentbrief.org/patent/us/10593988/electrochemical-cell-for-lithium-based-batteries"
    },
    {
      "patentNumber": "11239459",
      "countryCode": "US",
      "title": "Making Solid-State Battery Electrodes That Don't Swell and Crack",
      "url": "https://patentbrief.org/patent/us/11239459/low-expansion-composite-electrodes-for-all-solid-state-batteries"
    },
    {
      "patentNumber": "11094998",
      "countryCode": "US",
      "title": "Making Safer Battery Separators with Ceramic Coatings",
      "url": "https://patentbrief.org/patent/us/11094998/ceramic-coated-separators-for-lithium-containing-electrochemical-cells-and-metho"
    }
  ]
}