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  "node": {
    "id": "term:electrolyte",
    "type": "Term",
    "label": "Electrolyte",
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      "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.",
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        "title": "Ions and electrons",
        "text": "Electrolyte carries ions between electrodes; the external circuit carries electrons. The two paths serve different roles."
      },
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      "label": "Electrolytes and separators",
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        "name": "Electrolytes and separators",
        "lede": "What sits between the electrodes: liquid, gel and solid electrolytes, their salts, solvents and additives, and the separator that keeps the electrodes apart.",
        "context": "Connect transport with electronic isolation.",
        "example": "Greater liquid uptake may improve wetting while changing mechanical behavior. Several properties define separator performance.",
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      "label": "Lithium salt",
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        "definition": "The dissolved salt that supplies the mobile lithium ions in a liquid electrolyte, almost always lithium hexafluorophosphate, LiPF₆, at about one mole per litre. It reacts with traces of water to form hydrofluoric acid, which is why cells are filled in a dry room.",
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      "id": "term:carbonate-solvent",
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      "label": "Carbonate solvent",
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        "aka": [
          "EC",
          "DMC",
          "EMC",
          "DEC"
        ],
        "section": "topic-electrolytes",
        "definition": "The organic liquids that dissolve the lithium salt: cyclic ethylene carbonate, which forms a stable SEI, blended with linear carbonates such as DMC or EMC to lower viscosity. All are flammable, which is a root of lithium-ion fire risk.",
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          "electrolyte",
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        "section": "topic-electrolytes",
        "definition": "A compound added to the electrolyte at a few percent to improve one property — vinylene carbonate and fluoroethylene carbonate build a tougher SEI, others suppress gassing or overcharge. Additive packages are among a cell maker’s closest secrets.",
        "related": [
          "electrolyte",
          "sei",
          "formation",
          "gas-generation",
          "libob"
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        "url": "https://lemonergy.com/learn/glossary/electrolyte-additive/",
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      "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:solid-electrolyte",
      "type": "Term",
      "label": "Solid electrolyte",
      "properties": {
        "id": "solid-electrolyte",
        "name": "Solid electrolyte",
        "section": "topic-electrolytes",
        "definition": "A solid ion conductor that replaces the liquid electrolyte in an all-solid-state cell. Oxide, sulfide, halide and polymer families each need a different production route.",
        "related": [
          "solid-state-battery",
          "electrolyte",
          "sintering",
          "stack-pressure",
          "ionic-conductivity",
          "superionic-conductor"
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        "lesson": "fundamentals/solid-state-cell-production/#families",
        "url": "https://lemonergy.com/learn/glossary/solid-electrolyte/",
        "mentions": []
      }
    },
    {
      "id": "term:ionic-liquid-electrolyte",
      "type": "Term",
      "label": "Ionic liquid electrolyte",
      "properties": {
        "id": "ionic-liquid-electrolyte",
        "name": "Ionic liquid electrolyte",
        "section": "topic-electrolytes",
        "definition": "An electrolyte based on a salt that is liquid at room temperature, with negligible vapour pressure and so no flammability. High viscosity, cost and poor graphite compatibility have confined it to niche cells.",
        "related": [
          "electrolyte",
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          "ionic-conductivity"
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        "url": "https://lemonergy.com/learn/glossary/ionic-liquid-electrolyte/",
        "mentions": [
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    {
      "id": "term:separator",
      "type": "Term",
      "label": "Separator",
      "properties": {
        "id": "separator",
        "name": "Separator",
        "section": "topic-electrolytes",
        "definition": "A porous, electronically insulating film between the electrodes. Electrons cannot cross it; ions move through the electrolyte in its pores.",
        "related": [
          "electrolyte",
          "ceramic-coated-separator",
          "separator-shutdown",
          "internal-short-circuit",
          "porosity"
        ],
        "lesson": "fundamentals/cell-architecture/#separator",
        "example": {
          "title": "Different conduction paths",
          "text": "A separator prevents direct electronic contact while permitting ionic transport through its electrolyte-filled structure."
        },
        "url": "https://lemonergy.com/learn/glossary/separator/",
        "mentions": []
      }
    },
    {
      "id": "lesson:fundamentals/cell-architecture/",
      "type": "Lesson",
      "label": "Lesson 1B · Cell architecture",
      "properties": {
        "url": "https://lemonergy.com/learn/fundamentals/cell-architecture/"
      }
    },
    {
      "id": "visual:porous",
      "type": "Visual",
      "label": "Porosity reduces effective transport",
      "properties": {
        "title": "Porosity reduces effective transport",
        "summary": "A Bruggeman relation approximates transport through a porous medium.",
        "readout": "At 40% porosity, D_eff is 25.298% of bulk diffusivity.",
        "formula": "D_eff = D εᵇ",
        "note": "An empirical pore-structure assumption; actual tortuosity must be characterized.",
        "software": {
          "status": "reference",
          "label": "Reference concept",
          "body": "The flux helper accepts a supplied diffusivity. It does not estimate porosity or tortuosity. The shown D_eff = D εᵇ relationship is an explicit teaching assumption.",
          "href": "../transport/ficks-first-law/"
        },
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      }
    },
    {
      "id": "reference:xu-electrolytes",
      "type": "Reference",
      "label": "Electrolytes and Interphases in Li-Ion Batteries and Beyond",
      "properties": {
        "title": "Electrolytes and Interphases in Li-Ion Batteries and Beyond",
        "publisher": "Chemical Reviews",
        "url": "https://doi.org/10.1021/cr500003w",
        "type": "Review article",
        "scope": "Electrolyte salts, solvents, additives and electrode interphases.",
        "year": 2014,
        "authors": [
          "Kang Xu"
        ],
        "accessed": "2026-10-27"
      }
    }
  ]
}
