{
  "node": {
    "id": "term:lipf6",
    "type": "Term",
    "label": "Lithium hexafluorophosphate",
    "properties": {
      "id": "lipf6",
      "name": "Lithium hexafluorophosphate",
      "abbr": "LiPF₆",
      "section": "topic-electrolytes",
      "definition": "The lithium salt in nearly every commercial electrolyte, chosen for conductivity, aluminium passivation and cost rather than stability: it decomposes above about 60 °C and reacts with water to form HF.",
      "related": [
        "lithium-salt",
        "hydrofluoric-acid",
        "lifsi",
        "dry-room",
        "aluminium-foil"
      ],
      "url": "https://lemonergy.com/learn/glossary/lipf6/",
      "mentions": [
        "electrolyte",
        "passivation"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:3408",
      "source": "term:lipf6",
      "target": "topic:topic-electrolytes",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:3409",
      "source": "term:lipf6",
      "target": "term:lithium-salt",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3410",
      "source": "term:lipf6",
      "target": "term:hydrofluoric-acid",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3411",
      "source": "term:lipf6",
      "target": "term:lifsi",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3412",
      "source": "term:lipf6",
      "target": "term:dry-room",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3413",
      "source": "term:lipf6",
      "target": "term:aluminium-foil",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/lipf6/electrolyte",
      "source": "term:lipf6",
      "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/lipf6/passivation",
      "source": "term:lipf6",
      "target": "term:passivation",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    },
    {
      "id": "edge:3416",
      "source": "term:lipf6",
      "target": "reference:xu-electrolytes",
      "type": "cites",
      "properties": {
        "sourceFile": "wiki-references.json",
        "scope": "direct technical reference"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-electrolytes",
      "type": "Topic",
      "label": "Electrolytes and separators",
      "properties": {
        "id": "topic-electrolytes",
        "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.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/cell-anatomy/",
        "lesson_label": "Open cell anatomy"
      }
    },
    {
      "id": "term:lithium-salt",
      "type": "Term",
      "label": "Lithium salt",
      "properties": {
        "id": "lithium-salt",
        "name": "Lithium salt",
        "aka": [
          "LiPF₆",
          "LiFSI"
        ],
        "section": "topic-electrolytes",
        "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.",
        "related": [
          "electrolyte",
          "carbonate-solvent",
          "dry-room",
          "hydrofluoric-acid"
        ],
        "url": "https://lemonergy.com/learn/glossary/lithium-salt/",
        "mentions": [
          "lipf6"
        ]
      }
    },
    {
      "id": "term:hydrofluoric-acid",
      "type": "Term",
      "label": "Hydrofluoric acid",
      "properties": {
        "id": "hydrofluoric-acid",
        "name": "Hydrofluoric acid",
        "abbr": "HF",
        "section": "topic-safety",
        "definition": "Formed when LiPF₆ electrolyte meets water, or when a fluorinated cell burns. Inside a cell traces of it attack the positive electrode and SEI; in a fire it is the most dangerous component of the vented gas.",
        "related": [
          "lithium-salt",
          "off-gas",
          "transition-metal-dissolution",
          "dry-room"
        ],
        "url": "https://lemonergy.com/learn/glossary/hydrofluoric-acid/",
        "mentions": [
          "electrode",
          "positive-electrode",
          "electrolyte",
          "sei",
          "lipf6"
        ]
      }
    },
    {
      "id": "term:lifsi",
      "type": "Term",
      "label": "Lithium bis(fluorosulfonyl)imide",
      "properties": {
        "id": "lifsi",
        "name": "Lithium bis(fluorosulfonyl)imide",
        "abbr": "LiFSI",
        "section": "topic-electrolytes",
        "definition": "A salt with higher conductivity and far better thermal and moisture stability than LiPF₆, increasingly blended with it or used in fast-charge and lithium-metal electrolytes. Its drawback is corrosion of aluminium at high voltage unless LiPF₆ is also present.",
        "related": [
          "lipf6",
          "lithium-salt",
          "litfsi",
          "fast-charging"
        ],
        "url": "https://lemonergy.com/learn/glossary/lifsi/",
        "mentions": []
      }
    },
    {
      "id": "term:dry-room",
      "type": "Term",
      "label": "Dry room",
      "properties": {
        "id": "dry-room",
        "name": "Dry room",
        "section": "topic-manufacturing",
        "definition": "A production room whose air is kept extremely dry — dew points around −30 °C to −60 °C — so that no moisture reaches the cell while the electrolyte goes in. Water would react with the salt LiPF₆ to form hydrofluoric acid.",
        "related": [
          "dew-point",
          "vacuum-drying",
          "electrolyte-filling",
          "lithium-salt"
        ],
        "lesson": "fundamentals/cell-production/#assembly",
        "url": "https://lemonergy.com/learn/glossary/dry-room/",
        "mentions": [
          "electrolyte",
          "hydrofluoric-acid",
          "lipf6"
        ]
      }
    },
    {
      "id": "term:aluminium-foil",
      "type": "Term",
      "label": "Aluminium foil",
      "properties": {
        "id": "aluminium-foil",
        "name": "Aluminium foil",
        "section": "topic-components",
        "definition": "The positive current collector, typically 10–15 µm thick. A thin passive film keeps it stable at the high potential of the positive electrode, where copper would corrode.",
        "related": [
          "current-collector",
          "copper-foil",
          "passivation"
        ],
        "example": {
          "title": "Keep normalization consistent",
          "text": "Active-material capacity can remain unchanged while a heavier foil lowers a finished electrode’s capacity per unit total mass."
        },
        "url": "https://lemonergy.com/learn/glossary/aluminium-foil/",
        "mentions": [
          "electrode",
          "positive-electrode"
        ]
      }
    },
    {
      "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:passivation",
      "type": "Term",
      "label": "Passivation",
      "properties": {
        "id": "passivation",
        "name": "Passivation",
        "section": "topic-aging",
        "definition": "The formation of a surface film that slows further reaction. In lithium-ion cells, the SEI passivates the graphite negative electrode.",
        "related": [
          "sei",
          "aluminium-foil",
          "formation"
        ],
        "lesson": "fundamentals/battery-aging/#sei",
        "url": "https://lemonergy.com/learn/glossary/passivation/",
        "mentions": [
          "electrode",
          "negative-electrode",
          "graphite"
        ]
      }
    },
    {
      "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"
      }
    }
  ]
}