{
  "node": {
    "id": "term:half-cell",
    "type": "Term",
    "label": "Half-cell",
    "properties": {
      "id": "half-cell",
      "name": "Half-cell",
      "section": "topic-testing",
      "definition": "A test cell with the electrode under study against lithium metal, so the measured potential is that electrode’s alone. It is how a new material’s capacity and voltage are first measured, usually in coin-cell format.",
      "related": [
        "coin-cell",
        "full-cell",
        "electrode-potential",
        "lithium-metal-anode"
      ],
      "url": "https://lemonergy.com/learn/glossary/half-cell/",
      "mentions": [
        "electrode"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:2691",
      "source": "term:half-cell",
      "target": "topic:topic-testing",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:2692",
      "source": "term:half-cell",
      "target": "term:coin-cell",
      "type": "relatedTo",
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        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
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      "id": "edge:2693",
      "source": "term:half-cell",
      "target": "term:full-cell",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:2694",
      "source": "term:half-cell",
      "target": "term:electrode-potential",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:2695",
      "source": "term:half-cell",
      "target": "term:lithium-metal-anode",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
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      "id": "edge:mentions/half-cell/electrode",
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      "target": "term:electrode",
      "type": "mentions",
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      "id": "topic:topic-testing",
      "type": "Topic",
      "label": "Testing methods",
      "properties": {
        "id": "topic-testing",
        "name": "Testing methods",
        "lede": "The measurements and test procedures that characterise a cell or pack, from capacity and pulse tests to abuse and environmental tests.",
        "context": "Record specimen, state, instrument, temperature and timing.",
        "example": "Resistance immediately after a current step can differ from a ten-second value because slower polarization contributes.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/",
        "lesson_label": "Open capacity measurements"
      }
    },
    {
      "id": "term:coin-cell",
      "type": "Term",
      "label": "Coin cell",
      "properties": {
        "id": "coin-cell",
        "name": "Coin cell",
        "aka": [
          "button cell",
          "CR2032"
        ],
        "section": "topic-chemistries",
        "definition": "A small disc-shaped cell in a crimped steel case. Besides powering watches and key fobs, it is the standard laboratory format for testing a new electrode material against lithium metal.",
        "related": [
          "half-cell",
          "testing",
          "lithium-metal-anode"
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        "mentions": [
          "electrode"
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      "id": "term:full-cell",
      "type": "Term",
      "label": "Full cell",
      "properties": {
        "id": "full-cell",
        "name": "Full cell",
        "section": "topic-testing",
        "definition": "A test cell with both a real positive and a real negative electrode, as in a product. It is the only configuration that shows lithium inventory loss, since the lithium supply is finite.",
        "related": [
          "half-cell",
          "loss-of-lithium-inventory",
          "three-electrode-cell"
        ],
        "url": "https://lemonergy.com/learn/glossary/full-cell/",
        "mentions": [
          "electrode",
          "negative-electrode"
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      "id": "term:electrode-potential",
      "type": "Term",
      "label": "Electrode potential",
      "properties": {
        "id": "electrode-potential",
        "name": "Electrode potential",
        "section": "topic-electrochemistry",
        "definition": "The potential of an electrode relative to a reference, which for lithium-ion work is lithium metal in the same electrolyte, written as V vs Li/Li⁺. Graphite sits near 0.1 V and layered oxides near 3.7–4.3 V on this scale.",
        "unit": "V vs Li/Li⁺",
        "related": [
          "standard-potential",
          "cell-voltage",
          "reference-electrode",
          "half-reaction"
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        "lesson": "labs/battery-materials-lab/#battery-materials-lab",
        "url": "https://lemonergy.com/learn/glossary/electrode-potential/",
        "mentions": [
          "electrode",
          "graphite",
          "electrolyte"
        ]
      }
    },
    {
      "id": "term:lithium-metal-anode",
      "type": "Term",
      "label": "Lithium metal anode",
      "properties": {
        "id": "lithium-metal-anode",
        "name": "Lithium metal anode",
        "section": "topic-components",
        "definition": "A negative electrode made of lithium metal itself. It stores about ten times more charge per gram than graphite, which is the main attraction of solid-state cells, but it is reactive and prone to uneven deposits.",
        "related": [
          "lithium-metal-battery",
          "dendrite",
          "solid-state-battery",
          "anode-free"
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        "lesson": "fundamentals/solid-state-cell-production/#why",
        "url": "https://lemonergy.com/learn/glossary/lithium-metal-anode/",
        "mentions": [
          "electrode",
          "negative-electrode",
          "graphite"
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      }
    },
    {
      "id": "term:electrode",
      "type": "Term",
      "label": "Electrode",
      "properties": {
        "id": "electrode",
        "name": "Electrode",
        "section": "topic-components",
        "definition": "A solid conductor where the cell’s reaction happens, in contact with the electrolyte. A lithium-ion cell has a negative electrode and a positive electrode, each a porous coating on a metal foil.",
        "related": [
          "negative-electrode",
          "positive-electrode",
          "porous-electrode",
          "current-collector"
        ],
        "lesson": "fundamentals/cell-anatomy/#components",
        "example": {
          "title": "Two transport paths",
          "text": "Electrons need connected solid paths to the collector; ions need electrolyte paths to reaction sites. More of one constituent displaces others at fixed volume."
        },
        "url": "https://lemonergy.com/learn/glossary/electrode/",
        "mentions": [
          "electrolyte",
          "coating"
        ]
      }
    }
  ]
}