{
  "node": {
    "id": "term:migration",
    "type": "Term",
    "label": "Migration",
    "properties": {
      "id": "migration",
      "name": "Migration",
      "section": "topic-transport",
      "definition": "Movement of ions driven by an electric field rather than a concentration difference. In the electrolyte both migration and diffusion carry lithium; the transference number says how much of the current the lithium ions carry by migration.",
      "related": [
        "diffusion",
        "transference-number",
        "ionic-conductivity"
      ],
      "url": "https://lemonergy.com/learn/glossary/migration/",
      "mentions": [
        "electrolyte"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:2083",
      "source": "term:migration",
      "target": "topic:topic-transport",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:2084",
      "source": "term:migration",
      "target": "term:diffusion",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:2085",
      "source": "term:migration",
      "target": "term:transference-number",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:2086",
      "source": "term:migration",
      "target": "term:ionic-conductivity",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/migration/electrolyte",
      "source": "term:migration",
      "target": "term:electrolyte",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
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      "id": "edge:2088",
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      "target": "reference:iupac-green",
      "type": "cites",
      "properties": {
        "sourceFile": "wiki-references.json",
        "scope": "direct technical reference"
      }
    }
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    {
      "id": "topic:topic-transport",
      "type": "Topic",
      "label": "Transport and modelling",
      "properties": {
        "id": "topic-transport",
        "name": "Transport and modelling",
        "lede": "How ions move, and the equations and models that describe a cell.",
        "context": "Specify phase, direction and boundaries.",
        "example": "The same concentration difference across 10 μm gives ten times the gradient across 100 μm; at equal D, first-law flux magnitude is ten times greater.",
        "lesson_url": "https://lemonergy.com/learn/transport/ficks-first-law/",
        "lesson_label": "Open diffusion"
      }
    },
    {
      "id": "term:diffusion",
      "type": "Term",
      "label": "Diffusion",
      "properties": {
        "id": "diffusion",
        "name": "Diffusion",
        "section": "topic-transport",
        "definition": "The net movement of a species from where it is concentrated to where it is scarce, driven by random thermal motion. In a cell lithium diffuses through the electrolyte in the pores and, far more slowly, through the solid particles themselves.",
        "related": [
          "ficks-first-law",
          "diffusion-coefficient",
          "solid-state-diffusion",
          "concentration-gradient",
          "migration"
        ],
        "lesson": "transport/ficks-first-law/#in-a-cell",
        "url": "https://lemonergy.com/learn/glossary/diffusion/",
        "mentions": [
          "electrolyte"
        ]
      }
    },
    {
      "id": "term:transference-number",
      "type": "Term",
      "label": "Transference number",
      "properties": {
        "id": "transference-number",
        "name": "Transference number",
        "abbr": "t₊",
        "section": "topic-electrochemistry",
        "definition": "The fraction of the ionic current carried by the lithium ion rather than by the anion, about 0.3–0.4 in liquid electrolytes. A low value lets concentration gradients build up under load; single-ion solid electrolytes have a value near 1.",
        "unit": "—",
        "related": [
          "ionic-conductivity",
          "concentration-polarization",
          "solid-electrolyte",
          "migration"
        ],
        "url": "https://lemonergy.com/learn/glossary/transference-number/",
        "mentions": []
      }
    },
    {
      "id": "term:ionic-conductivity",
      "type": "Term",
      "label": "Ionic conductivity",
      "properties": {
        "id": "ionic-conductivity",
        "name": "Ionic conductivity",
        "abbr": "σ",
        "section": "topic-electrochemistry",
        "definition": "How readily an electrolyte carries ions, in siemens per centimetre. Liquid carbonate electrolytes reach about 10 mS/cm at room temperature; the best sulfide solid electrolytes match that, while polymers fall far short unless heated.",
        "unit": "mS/cm",
        "related": [
          "electrolyte",
          "solid-electrolyte",
          "transference-number",
          "siemens"
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        "url": "https://lemonergy.com/learn/glossary/ionic-conductivity/",
        "mentions": []
      }
    },
    {
      "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": "reference:iupac-green",
      "type": "Reference",
      "label": "Quantities, Units and Symbols in Physical Chemistry, 3rd edition, 2nd printing",
      "properties": {
        "title": "Quantities, Units and Symbols in Physical Chemistry, 3rd edition, 2nd printing",
        "publisher": "IUPAC",
        "url": "https://media.iupac.org/publications/books/gbook/IUPAC-GB3-2ndPrinting-Online-22apr2011.pdf",
        "type": "Technical reference",
        "scope": "Physical-chemistry notation, thermodynamics, electrochemistry and transport quantities.",
        "year": 2011,
        "accessed": "2026-10-27"
      }
    }
  ]
}