{
  "node": {
    "id": "term:paa",
    "type": "Term",
    "label": "Polyacrylic acid",
    "properties": {
      "id": "paa",
      "name": "Polyacrylic acid",
      "abbr": "PAA",
      "section": "topic-components",
      "definition": "A water-based binder with many carboxyl groups that bond strongly to silicon surfaces, used in silicon-rich negative electrodes where CMC/SBR cannot hold the swelling particles together.",
      "related": [
        "binder",
        "silicon-anode",
        "cmc"
      ],
      "url": "https://lemonergy.com/learn/glossary/paa/",
      "mentions": [
        "swelling",
        "sbr"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:3461",
      "source": "term:paa",
      "target": "topic:topic-components",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:3462",
      "source": "term:paa",
      "target": "term:binder",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3463",
      "source": "term:paa",
      "target": "term:silicon-anode",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3464",
      "source": "term:paa",
      "target": "term:cmc",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/paa/swelling",
      "source": "term:paa",
      "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/paa/sbr",
      "source": "term:paa",
      "target": "term:sbr",
      "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-components",
      "type": "Topic",
      "label": "Cell components and electrode materials",
      "properties": {
        "id": "topic-components",
        "name": "Cell components and electrode materials",
        "lede": "What a cell is physically made of — active materials, binders, additives, foils and tabs — and how its electrodes are put together.",
        "context": "Connect each material with its function.",
        "example": "Electrons travel through additive, foil and tab; ions use electrolyte and separator pathways.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/cell-anatomy/",
        "lesson_label": "Open cell anatomy"
      }
    },
    {
      "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:silicon-anode",
      "type": "Term",
      "label": "Silicon anode",
      "properties": {
        "id": "silicon-anode",
        "name": "Silicon anode",
        "aka": [
          "silicon-graphite",
          "SiOx"
        ],
        "section": "topic-components",
        "definition": "A negative electrode that uses silicon, which alloys with lithium and stores roughly ten times more charge per gram than graphite but swells by up to 300 %. Today it is blended into graphite at a few percent to limit the swelling.",
        "related": [
          "graphite",
          "alloying",
          "particle-cracking",
          "swelling",
          "self-healing-binder"
        ],
        "example": {
          "title": "Read the mixture basis",
          "text": "A silicon-containing electrode may be a blend rather than pure silicon. A silicon percentage needs a clear mass basis."
        },
        "url": "https://lemonergy.com/learn/glossary/silicon-anode/",
        "mentions": [
          "electrode",
          "negative-electrode"
        ]
      }
    },
    {
      "id": "term:cmc",
      "type": "Term",
      "label": "Carboxymethyl cellulose",
      "properties": {
        "id": "cmc",
        "name": "Carboxymethyl cellulose",
        "abbr": "CMC",
        "section": "topic-components",
        "definition": "A water-soluble cellulose derivative used with SBR as the binder system for graphite electrodes. It thickens the aqueous slurry and disperses the particles; SBR supplies the elasticity.",
        "related": [
          "binder",
          "sbr",
          "slurry",
          "pvdf"
        ],
        "url": "https://lemonergy.com/learn/glossary/cmc/",
        "mentions": [
          "graphite"
        ]
      }
    },
    {
      "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:sbr",
      "type": "Term",
      "label": "Styrene–butadiene rubber",
      "properties": {
        "id": "sbr",
        "name": "Styrene–butadiene rubber",
        "abbr": "SBR",
        "section": "topic-components",
        "definition": "A rubber latex that gives graphite coatings their flexibility and adhesion to copper, used at about 1–2 % together with CMC. The pair lets negative electrodes be made with water instead of NMP.",
        "related": [
          "cmc",
          "binder",
          "pvdf",
          "nmp"
        ],
        "url": "https://lemonergy.com/learn/glossary/sbr/",
        "mentions": [
          "graphite"
        ]
      }
    }
  ]
}