{
  "node": {
    "id": "term:power-cell-energy-cell",
    "type": "Term",
    "label": "Power cell and energy cell",
    "properties": {
      "id": "power-cell-energy-cell",
      "name": "Power cell and energy cell",
      "section": "topic-applications",
      "definition": "Two design points of the same chemistry: a power cell has thin, porous electrodes and many tabs for high current and fast charging; an energy cell has thick, dense electrodes for maximum watt-hours. A hybrid car wants the first, a long-range car the second.",
      "related": [
        "specific-power",
        "specific-energy",
        "areal-loading",
        "cell-design"
      ],
      "url": "https://lemonergy.com/learn/glossary/power-cell-energy-cell/",
      "mentions": [
        "fast-charging"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:3196",
      "source": "term:power-cell-energy-cell",
      "target": "topic:topic-applications",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:3197",
      "source": "term:power-cell-energy-cell",
      "target": "term:specific-power",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3198",
      "source": "term:power-cell-energy-cell",
      "target": "term:specific-energy",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3199",
      "source": "term:power-cell-energy-cell",
      "target": "term:areal-loading",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3200",
      "source": "term:power-cell-energy-cell",
      "target": "term:cell-design",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/power-cell-energy-cell/fast-charging",
      "source": "term:power-cell-energy-cell",
      "target": "term:fast-charging",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; not a causal claim"
      }
    },
    {
      "id": "edge:3202",
      "source": "term:power-cell-energy-cell",
      "target": "reference:inl-ev-tests",
      "type": "cites",
      "properties": {
        "sourceFile": "wiki-references.json",
        "scope": "direct technical reference"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-applications",
      "type": "Topic",
      "label": "Applications and market",
      "properties": {
        "id": "topic-applications",
        "name": "Applications and market",
        "lede": "Where batteries are used, and the terms used to buy, size and compare them.",
        "context": "Start with mission energy, peak power and operating conditions.",
        "example": "20 kWh total energy and a ten-second 100 kW peak constrain different design aspects.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/capacity-and-c-rate/",
        "lesson_label": "Open energy and power"
      }
    },
    {
      "id": "term:specific-power",
      "type": "Term",
      "label": "Specific power",
      "properties": {
        "id": "specific-power",
        "name": "Specific power",
        "aka": [
          "power density"
        ],
        "section": "topic-ratings",
        "definition": "Deliverable power per unit mass, in watts per kilogram; power density is the same per litre. A cell is designed for energy or for power, rarely both: thin electrodes give power, thick ones give energy.",
        "unit": "W/kg",
        "related": [
          "power",
          "specific-energy",
          "ragone-plot",
          "areal-loading",
          "power-cell-energy-cell"
        ],
        "url": "https://lemonergy.com/learn/glossary/specific-power/",
        "mentions": []
      }
    },
    {
      "id": "term:specific-energy",
      "type": "Term",
      "label": "Specific energy",
      "properties": {
        "id": "specific-energy",
        "name": "Specific energy",
        "aka": [
          "gravimetric energy density"
        ],
        "section": "topic-ratings",
        "definition": "Stored energy per unit mass, in watt-hours per kilogram. Commercial lithium-ion cells range from about 160 Wh/kg for LFP to around 270 Wh/kg for high-nickel chemistries; at pack level the figure drops by a quarter or more.",
        "unit": "Wh/kg",
        "related": [
          "energy-density",
          "cell-to-pack-ratio",
          "specific-capacity",
          "ragone-plot"
        ],
        "lesson": "fundamentals/capacity-and-c-rate/#energy",
        "url": "https://lemonergy.com/learn/glossary/specific-energy/",
        "mentions": []
      }
    },
    {
      "id": "term:areal-loading",
      "type": "Term",
      "label": "Areal loading",
      "properties": {
        "id": "areal-loading",
        "name": "Areal loading",
        "aka": [
          "mass loading",
          "areal capacity"
        ],
        "section": "topic-components",
        "definition": "How much active material, or capacity, an electrode carries per square centimetre of foil, typically 2–5 mAh/cm². Higher loading raises energy density but lengthens the ion path, which limits fast charging.",
        "unit": "mAh/cm², mg/cm²",
        "related": [
          "coating",
          "energy-density",
          "fast-charging",
          "tortuosity"
        ],
        "example": {
          "title": "Convert mass and area",
          "text": "200 mg active material over 20 cm² gives 10 mg/cm² loading. State whether the measurement includes one or both coated sides."
        },
        "url": "https://lemonergy.com/learn/glossary/areal-loading/",
        "mentions": [
          "milliampere-hour",
          "electrode",
          "active-material"
        ]
      }
    },
    {
      "id": "term:cell-design",
      "type": "Term",
      "label": "Cell design",
      "properties": {
        "id": "cell-design",
        "name": "Cell design",
        "section": "topic-manufacturing",
        "definition": "Choosing the chemistry, electrode loadings, porosities, N/P ratio, separator, electrolyte volume and format that together meet an energy, power, life, safety and cost target. Each choice trades against the others: thicker electrodes raise energy and lower power.",
        "related": [
          "np-ratio",
          "areal-loading",
          "porosity",
          "energy-density",
          "specific-power"
        ],
        "url": "https://lemonergy.com/learn/glossary/cell-design/",
        "mentions": [
          "electrode",
          "separator",
          "electrolyte"
        ]
      }
    },
    {
      "id": "term:fast-charging",
      "type": "Term",
      "label": "Fast charging",
      "properties": {
        "id": "fast-charging",
        "name": "Fast charging",
        "section": "topic-charging",
        "definition": "Charging intended to replenish a specified amount of energy or state of charge in a short time. There is no universal C-rate threshold: performance depends on cell chemistry, temperature, starting state and power limits. High current can increase heating and lithium-plating risk, requiring appropriate limits.",
        "related": [
          "lithium-plating",
          "c-rate",
          "cc-cv-charging",
          "dc-fast-charging",
          "thermal-management",
          "mscc"
        ],
        "url": "https://lemonergy.com/learn/glossary/fast-charging/",
        "mentions": [
          "state-of-charge"
        ]
      }
    },
    {
      "id": "reference:inl-ev-tests",
      "type": "Reference",
      "label": "Battery Test Manual For Electric Vehicles, Revision 3",
      "properties": {
        "title": "Battery Test Manual For Electric Vehicles, Revision 3",
        "publisher": "Idaho National Laboratory",
        "url": "https://inldigitallibrary.inl.gov/sites/sti/sti/6492291.pdf",
        "type": "Test manual",
        "scope": "Performance characterization, pulse resistance/power, life testing and reference performance tests; historical 2015 edition.",
        "year": 2015,
        "authors": [
          "Jon P. Christopherson"
        ],
        "accessed": "2026-10-27"
      }
    }
  ]
}