{
  "node": {
    "id": "term:binder-degradation",
    "type": "Term",
    "label": "Binder degradation",
    "properties": {
      "id": "binder-degradation",
      "name": "Binder degradation",
      "section": "topic-aging",
      "definition": "Loss of the binder’s ability to hold particles to each other and to the foil, from swelling in electrolyte, repeated strain or heat. Particles that lose contact stop storing lithium, and the coating can delaminate from the foil.",
      "related": [
        "binder",
        "loss-of-active-material",
        "delamination"
      ],
      "url": "https://lemonergy.com/learn/glossary/binder-degradation/",
      "mentions": [
        "electrolyte",
        "swelling",
        "coating"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:1552",
      "source": "term:binder-degradation",
      "target": "topic:topic-aging",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:1553",
      "source": "term:binder-degradation",
      "target": "term:binder",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:1554",
      "source": "term:binder-degradation",
      "target": "term:loss-of-active-material",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:1555",
      "source": "term:binder-degradation",
      "target": "term:delamination",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/binder-degradation/electrolyte",
      "source": "term:binder-degradation",
      "target": "term:electrolyte",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/binder-degradation/swelling",
      "source": "term:binder-degradation",
      "target": "term:swelling",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/binder-degradation/coating",
      "source": "term:binder-degradation",
      "target": "term:coating",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-aging",
      "type": "Topic",
      "label": "Aging and degradation",
      "properties": {
        "id": "topic-aging",
        "name": "Aging and degradation",
        "lede": "Why a cell loses capacity and gains resistance, and the mechanisms behind it.",
        "context": "Separate mechanisms, observations and fitted models.",
        "example": "Capacity loss and resistance rise can have different causes; a film-growth curve cannot identify both.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/battery-aging/",
        "lesson_label": "Open aging"
      }
    },
    {
      "id": "term:binder",
      "type": "Term",
      "label": "Binder",
      "properties": {
        "id": "binder",
        "name": "Binder",
        "section": "topic-components",
        "definition": "A polymer that holds electrode particles to each other and to the foil — typically PVDF for positive electrodes and CMC with SBR for graphite. It stores no charge, so cell designers use as little as the electrode needs.",
        "related": [
          "active-material",
          "conductive-additive",
          "slurry",
          "pvdf",
          "nmp",
          "paa"
        ],
        "lesson": "fundamentals/cell-architecture/#composite",
        "example": {
          "title": "Balance coating functions",
          "text": "Increasing binder fraction at fixed coating mass leaves less mass for active material and conductive additive. Adhesion and capacity are separate design considerations."
        },
        "url": "https://lemonergy.com/learn/glossary/binder/",
        "mentions": [
          "electrode",
          "graphite",
          "cmc",
          "sbr"
        ]
      }
    },
    {
      "id": "term:loss-of-active-material",
      "type": "Term",
      "label": "Loss of active material",
      "properties": {
        "id": "loss-of-active-material",
        "name": "Loss of active material",
        "abbr": "LAM",
        "section": "topic-aging",
        "definition": "The degradation mode in which electrode material becomes unable to store lithium: particles crack and lose electronic contact, structures collapse, or transition metals dissolve. It is tracked separately for each electrode.",
        "related": [
          "particle-cracking",
          "transition-metal-dissolution",
          "loss-of-lithium-inventory",
          "capacity-fade"
        ],
        "url": "https://lemonergy.com/learn/glossary/loss-of-active-material/",
        "mentions": [
          "electrode",
          "aging-mechanism"
        ]
      }
    },
    {
      "id": "term:delamination",
      "type": "Term",
      "label": "Delamination",
      "properties": {
        "id": "delamination",
        "name": "Delamination",
        "section": "topic-aging",
        "definition": "Separation of the electrode coating from its current collector, or of layers within a cell, which cuts the electronic path to part of the electrode. It is caused by poor adhesion, binder degradation, gas pockets or repeated swelling.",
        "related": [
          "binder-degradation",
          "coating",
          "swelling",
          "loss-of-active-material",
          "electrode-peel-test"
        ],
        "url": "https://lemonergy.com/learn/glossary/delamination/",
        "mentions": [
          "electrode",
          "binder",
          "current-collector",
          "electronic-path"
        ]
      }
    },
    {
      "id": "term:electrolyte",
      "type": "Term",
      "label": "Electrolyte",
      "properties": {
        "id": "electrolyte",
        "name": "Electrolyte",
        "section": "topic-electrolytes",
        "definition": "The ion-conducting medium between the electrodes. In a liquid-electrolyte cell it fills the pores of both electrodes and the separator, so it is not a separate structural layer.",
        "related": [
          "lithium-salt",
          "carbonate-solvent",
          "electrolyte-additive",
          "ionic-conductivity",
          "solid-electrolyte",
          "ionic-liquid-electrolyte"
        ],
        "lesson": "fundamentals/cell-architecture/#electrolyte",
        "example": {
          "title": "Ions and electrons",
          "text": "Electrolyte carries ions between electrodes; the external circuit carries electrons. The two paths serve different roles."
        },
        "url": "https://lemonergy.com/learn/glossary/electrolyte/",
        "mentions": [
          "separator"
        ]
      }
    },
    {
      "id": "term:swelling",
      "type": "Term",
      "label": "Swelling",
      "properties": {
        "id": "swelling",
        "name": "Swelling",
        "section": "topic-aging",
        "definition": "Growth in a cell’s thickness, reversibly as the electrodes expand on charge and irreversibly as gas and SEI accumulate. Packs allow for it with compression pads, and a sudden swell in service is a warning sign.",
        "related": [
          "gas-generation",
          "pouch-cell",
          "silicon-anode",
          "stack-pressure",
          "compression-pad",
          "swelling-test"
        ],
        "url": "https://lemonergy.com/learn/glossary/swelling/",
        "mentions": [
          "sei"
        ]
      }
    },
    {
      "id": "term:coating",
      "type": "Term",
      "label": "Coating",
      "properties": {
        "id": "coating",
        "name": "Coating",
        "section": "topic-manufacturing",
        "definition": "Applying slurry to the moving foil at a controlled wet thickness, usually with a slot die, often on both sides. Coating weight per area must be held within about one percent across the web, because every downstream property depends on it.",
        "related": [
          "slot-die",
          "areal-loading",
          "drying",
          "electrode-manufacturing"
        ],
        "lesson": "fundamentals/cell-production/#electrodes",
        "example": {
          "title": "Wet and dry thickness differ",
          "text": "Wet coating includes solvent. Dry thickness also depends on retained solids and resulting structure."
        },
        "url": "https://lemonergy.com/learn/glossary/coating/",
        "mentions": [
          "slurry"
        ]
      }
    }
  ]
}