{
    "title": "Barium-Titanate Ultra-Capacitor",
    "inventor_name": "Richard Weir & Carl Nelson",
    "publication_year": 2006,
    "device_name": "EEStor Ultra-Capacitor",
    "goal": "Provide a high-energy-density, low-cost, lightweight energy-storage device that can charge in minutes and replace conventional batteries in vehicles and grid storage.",
    "problem_addressed": "Heavy, expensive, slow-charging chemical batteries (lead-acid, lithium-ion) that limit electric-vehicle range and increase system cost.",
    "concept_summary": "A solid-state ultracapacitor built as a parallel-plate capacitor whose dielectric is a ceramic barium-titanate material sandwiched between thousands of thin metal foils. The structure stores electrostatic energy at very high voltage, delivering high power density, fast charge/discharge, and long cycle life.",
    "detailed_description": null,
    "category": "Electromagnetism & Magnetism",
    "principles": [
        "Parallel-plate capacitor geometry",
        "High-dielectric-constant ceramic (barium titanate) as dielectric",
        "Solid-state electrostatic energy storage"
    ],
    "scientific_domains": [
        "Electrical Engineering",
        "Materials Science"
    ],
    "mechanisms_of_action": [
        "Electrostatic charge accumulation on metal plates",
        "Dielectric polarization of barium-titanate layers"
    ],
    "materials": [
        "Barium titanate (BaTiO_3) ceramic",
        "Thin metal foils (aluminum or copper)",
        "Ceramic binder / encapsul material"
    ],
    "energy_sources": [],
    "inputs": [
        "Electrical energy (charging voltage up to ~10x typical ultracapacitor voltage)"
    ],
    "outputs": [
        "Electrical energy (discharge) with high power capability"
    ],
    "claimed_performance": "Weight 400 lb, energy capacity 52 kWh, charge in minutes, up to 1 million charge cycles with no degradation, projected cost $3,200 (low-volume) dropping to $2,100 (high-volume).",
    "experimental_evidence": "Tested up to a million cycles with no material degradation compared to lead-acid batteries (as reported by EEStor).",
    "replication_status": null,
    "keywords": [
        "ultracapacitor",
        "barium titanate",
        "solid-state capacitor",
        "high-energy density",
        "fast charge",
        "EEStor"
    ],
    "related_technologies": [
        "Supercapacitor",
        "Solid-state battery",
        "Electrical storage unit (ESU)"
    ],
    "controversy_level": "high",
    "confidence_score": 0.7,
    "practicability_score": 0.5,
    "fringe_score": 0.6,
    "evidence_strength": 0.4,
    "risk_score": 0.2,
    "trl_estimate": 4,
    "source_urls": [
        "http://thefraserdomain.typepad.com/energy/2006/01/eestor_ultracap.html",
        "http://abcnews.go.com/Technology/Story?id=3547157&page=1",
        "http://www.impactlab.com/modules.php?name=News&file=article&sid=12931",
        "http://www.businessweek.com/the_thread/dealflow/archives/2005/09/kleiner_perkins_1.html",
        "http://www.treehugger.com/files/2006/03/eestor_capacito_1.php"
    ],
    "organizations": [
        "EEStor Inc.",
        "Kleiner Perkins Caufield & Byers",
        "Feel Good Cars",
        "ZENN Motor Co."
    ],
    "applications": [
        "Low-speed electric vehicles",
        "Full-speed electric vehicles",
        "Hybrid-electric plug-in vehicles",
        "Military power systems",
        "Backup power",
        "Large-scale utility storage for intermittent renewables"
    ],
    "limitations": [
        "No independent third-party verification of performance claims",
        "Manufacturing of defect-free barium-titanate layers at scale",
        "Very high operating voltage may require special infrastructure"
    ],
    "open_questions": [
        "Can mass production achieve the claimed dielectric quality and defect-free stacking?",
        "What is the true energy density achievable in a commercial device?",
        "Will the device meet automotive safety and certification standards?"
    ],
    "red_flags": [
        "Claims of >400-fold improvement over existing ultracapacitors without published data",
        "Potential over-unity implications raised by skeptics",
        "Lack of peer-reviewed or independently replicated test results"
    ],
    "evidence_quotes": [
        "The product weighs 400 pounds and delivers 52 kilowatt-hours.",
        "The EEStor technology has been tested up to a million cycles with no material degradation compared to lead acid batteries that optimistically have 500 to 700 recharge cycles.",
        "It's a parallel plate capacitor with barium titanate as the dielectric.",
        "The batteries fully charge in minutes as opposed to hours.",
        "EEStor is instead creating better nonconductive material for use between the metal sheets, using a chemical compound called barium titanate."
    ]
}