{
  "case_study_id": "case_study_02_battery_cathodes_interface_readiness",
  "title": "Better Battery Cathodes Through Interface-Aware and Build-Ready Screening",
  "slug": "battery-cathodes-interface-readiness",
  "generated_on": "2026-04-08",
  "description": "FluxMateria ran a local battery workflow that compared bulk ranking, interface readiness, battery-native scoring, and prototype handoff in one pass. The result was not one winner, but a set of distinct decision leaders for distinct engineering questions.",
  "public_scope": "Public packet with known material formulas, high-level metrics, and build recommendations. Implementation-specific workflow details, raw provenance, full build-sheet internals, and non-public generated variants are omitted.",
  "discovery_brief": {
    "objective": "Re-rank lithium cathode candidates using bulk properties, interface readiness, battery-native electrochemistry, and prototype-build readiness in one workflow.",
    "decision_layers": [
      "Bulk screening",
      "Interface and contact readiness",
      "Battery-native electrochemistry",
      "Prototype handoff"
    ],
    "key_question": "Would the same cathode remain the winner once interface risk, degradation, cycle life, manufacturability, and build readiness were considered together?"
  },
  "headline_metrics": {
    "runtime_seconds": 26.817,
    "curated_pool_size": 10,
    "bulk_winner": "LiNiO2",
    "interface_winner": "LiMnPO4",
    "hybrid_winner": "LiMn2O4",
    "battery_winner": "LiMnO2",
    "build_winner": "Li4Ti5O12"
  },
  "benchmark_summary": {
    "holdout_references": 6,
    "family_accuracy": 1.0,
    "capacity_mae_mAh_g": 0.812,
    "voltage_mae_V": 0.149,
    "transport_mae": 0.1427,
    "cycle_mae": 0.0642,
    "electrolyte_mae": 0.09,
    "interface_mae": 0.0883,
    "cost_mae": 0.0372,
    "manufacturing_mae": 0.0765,
    "energy_rank_spearman": 0.9429
  },
  "workflow_summary": [
    "Curated lithium-cathode baseline ranking",
    "Interface comparison against aluminum current-collector surfaces",
    "Battery-native electrochemistry scoring with calibration",
    "Prototype handoff and validation planning"
  ],
  "pipeline_summary": [
    {
      "step": 1,
      "label": "Curated candidate framing",
      "purpose": "Keep the comparison engineering-relevant and interpretable."
    },
    {
      "step": 2,
      "label": "Bulk engineering screen",
      "purpose": "Establish the bulk-only answer before interface and battery-native correction."
    },
    {
      "step": 3,
      "label": "Interface and contact pass",
      "purpose": "Re-rank for interface readiness instead of assuming bulk strength is sufficient."
    },
    {
      "step": 4,
      "label": "Battery-native electrochemistry pass",
      "purpose": "Bring transport, degradation, cycle-life, electrolyte/coating fit, and manufacturing into one ranking layer."
    },
    {
      "step": 5,
      "label": "Calibration and uncertainty",
      "purpose": "Attach benchmark support, confidence, and recommended next experiments to the shortlist."
    },
    {
      "step": 6,
      "label": "Prototype handoff",
      "purpose": "Separate the highest-upside candidate from the best immediate build package."
    }
  ],
  "timing_context": {
    "fluxmateria_local_runtime_seconds": 26.817,
    "public_claim": "FluxMateria compressed the computational decision layer into about 27 seconds locally while leaving real-world build and validation in the lab.",
    "conventional_workflow_context": [
      "Configuration-heavy DFT surface relaxations can take about 24 hours each, and many-configuration searches can stretch into days or weeks.",
      "Conventional lifetime and durability validation remains time-consuming and can run for years under accelerated protocols."
    ]
  },
  "final_shortlist": [
    {
      "candidate_id": "FM-BAT-01",
      "formula": "LiMnO2",
      "family_label": "Layered oxide",
      "role": "Top battery-native candidate",
      "specific_capacity_mAh_g": 285.49,
      "voltage_surrogate_V": 3.95,
      "battery_readiness_score": 77.7,
      "prototype_handoff_priority_score": 79.5,
      "prototype_handoff_label": "immediate_prototype_candidate",
      "recommended_electrolyte_family": "standard_carbonate",
      "recommended_surface_coating": "Li3PO4",
      "dominant_degradation_modes": [
        "chemo_mechanical_cracking",
        "transition_metal_dissolution",
        "voltage_window_stress"
      ],
      "recommended_next_experiments": [
        "post_cycle_xrd_sem_crack_screen",
        "icp_oes_transition_metal_dissolution_screen",
        "electrolyte_coating_ab_screen"
      ],
      "why_it_ranked": "Best overall balance of energy, voltage, calibrated battery-native score, and prototype-readiness without collapsing back to the bulk-only conclusion."
    },
    {
      "candidate_id": "FM-BAT-02",
      "formula": "Li4Ti5O12",
      "family_label": "Titanate spinel",
      "role": "Top immediate build candidate",
      "specific_capacity_mAh_g": 233.52,
      "voltage_surrogate_V": 1.55,
      "battery_readiness_score": 75.5,
      "prototype_handoff_priority_score": 88.3,
      "prototype_handoff_label": "immediate_prototype_candidate",
      "recommended_electrolyte_family": "standard_carbonate",
      "recommended_surface_coating": "TiO2",
      "dominant_degradation_modes": [
        "chemo_mechanical_cracking",
        "impedance_growth",
        "manageable_interphase_risk"
      ],
      "recommended_next_experiments": [
        "half_cell_voltage_profile_and_dQdV",
        "rate_capability_and_pulse_power_screen"
      ],
      "why_it_ranked": "Not the highest-energy option, but the strongest immediate build package because its cycle-life, degradation, and confidence profile are unusually favorable."
    },
    {
      "candidate_id": "FM-BAT-03",
      "formula": "LiMnPO4",
      "family_label": "Olivine phosphate",
      "role": "Top interface-corrected candidate",
      "specific_capacity_mAh_g": 170.87,
      "voltage_surrogate_V": 4.1,
      "battery_readiness_score": 72.1,
      "prototype_handoff_priority_score": 84.4,
      "prototype_handoff_label": "immediate_prototype_candidate",
      "recommended_electrolyte_family": "standard_carbonate",
      "recommended_surface_coating": "Li3PO4",
      "dominant_degradation_modes": [
        "chemo_mechanical_cracking",
        "transition_metal_dissolution",
        "impedance_growth"
      ],
      "recommended_next_experiments": [
        "rate_capability_and_pulse_power_screen",
        "icp_oes_transition_metal_dissolution_screen",
        "post_cycle_xrd_sem_crack_screen"
      ],
      "why_it_ranked": "The clearest proof that interface analysis changed the engineering conclusion: it moved from bulk rank 9 to interface rank 1."
    },
    {
      "candidate_id": "FM-BAT-04",
      "formula": "LiMn2O4",
      "family_label": "Spinel oxide",
      "role": "Top hybrid candidate",
      "specific_capacity_mAh_g": 148.22,
      "voltage_surrogate_V": 4.117,
      "battery_readiness_score": 72.5,
      "prototype_handoff_priority_score": 79.2,
      "prototype_handoff_label": "immediate_prototype_candidate",
      "recommended_electrolyte_family": "standard_carbonate",
      "recommended_surface_coating": "AlPO4",
      "dominant_degradation_modes": [
        "transition_metal_dissolution",
        "chemo_mechanical_cracking",
        "voltage_window_stress"
      ],
      "recommended_next_experiments": [
        "icp_oes_transition_metal_dissolution_screen",
        "electrolyte_coating_ab_screen",
        "post_cycle_xrd_sem_crack_screen"
      ],
      "why_it_ranked": "The best compromise between bulk and interface ranking, which is why it emerged as the top hybrid candidate."
    },
    {
      "candidate_id": "FM-BAT-05",
      "formula": "LiNiO2",
      "family_label": "Layered oxide",
      "role": "Top bulk-only candidate",
      "specific_capacity_mAh_g": 274.51,
      "voltage_surrogate_V": 3.85,
      "battery_readiness_score": 73.6,
      "prototype_handoff_priority_score": 73.8,
      "prototype_handoff_label": "immediate_prototype_candidate",
      "recommended_electrolyte_family": "standard_carbonate",
      "recommended_surface_coating": "LiNbO3",
      "dominant_degradation_modes": [
        "chemo_mechanical_cracking",
        "voltage_window_stress",
        "lithium_inventory_loss"
      ],
      "recommended_next_experiments": [
        "post_cycle_xrd_sem_crack_screen",
        "electrolyte_coating_ab_screen",
        "icp_oes_transition_metal_dissolution_screen"
      ],
      "why_it_ranked": "Still wins if the problem is framed only as bulk energy density, but it no longer survives as the obvious all-around answer."
    },
    {
      "candidate_id": "FM-BAT-06",
      "formula": "LiCoO2",
      "family_label": "Layered oxide",
      "role": "High-energy comparator",
      "specific_capacity_mAh_g": 273.84,
      "voltage_surrogate_V": 3.95,
      "battery_readiness_score": 74.8,
      "prototype_handoff_priority_score": 74.7,
      "prototype_handoff_label": "immediate_prototype_candidate",
      "recommended_electrolyte_family": "standard_carbonate",
      "recommended_surface_coating": "LiNbO3",
      "dominant_degradation_modes": [
        "chemo_mechanical_cracking",
        "voltage_window_stress",
        "lithium_inventory_loss"
      ],
      "recommended_next_experiments": [
        "post_cycle_xrd_sem_crack_screen",
        "electrolyte_coating_ab_screen",
        "icp_oes_transition_metal_dissolution_screen"
      ],
      "why_it_ranked": "Useful high-energy reference point for the shortlist, even though it does not dominate the build-handoff lane."
    }
  ],
  "build_handoff_summary": {
    "top_build_candidate": {
      "formula": "Li4Ti5O12",
      "family_label": "Titanate spinel",
      "build_stage": "immediate_prototype_candidate",
      "build_recommendation": "Build a first controlled prototype now.",
      "headline_metrics": {
        "specific_capacity_mAh_g": 233.52,
        "voltage_surrogate_V": 1.55,
        "battery_readiness_score": 75.5,
        "prototype_handoff_priority_score": 88.3
      },
      "recommended_configuration": {
        "anode_family": "graphite",
        "electrolyte_family": "standard_carbonate",
        "separator_family": "polyolefin",
        "surface_coating": "TiO2"
      },
      "dominant_risks": [
        "chemo_mechanical_cracking",
        "impedance_growth",
        "manageable_interphase_risk"
      ],
      "top_validation_experiments": [
        "half_cell_voltage_profile_and_dQdV",
        "rate_capability_and_pulse_power_screen"
      ]
    }
  },
  "literature_context": [
    {
      "formula": "LiCoO2",
      "status": "historically validated commercial family",
      "interpretation": "FluxMateria converged on the canonical commercial layered-oxide lineage rather than implausible chemistry.",
      "references": [
        "https://www.nature.com/articles/s41467-020-16259-9"
      ]
    },
    {
      "formula": "LiMn2O4",
      "status": "well-established spinel family with known Mn-dissolution issues",
      "interpretation": "The pipeline recovered a real industrial manganese-spinel direction together with one of its best-known degradation liabilities.",
      "references": [
        "https://www.nature.com/articles/s41560-021-00815-8",
        "https://www.nature.com/articles/s41467-020-15355-0"
      ]
    },
    {
      "formula": "LiMnPO4",
      "status": "known high-voltage olivine family with transport and conductivity limits",
      "interpretation": "FluxMateria surfaced the same voltage-versus-transport tradeoff the literature has documented for years.",
      "references": [
        "https://www.osti.gov/pages/servlets/purl/1430487"
      ]
    },
    {
      "formula": "LiNiO2",
      "status": "known high-energy cobalt-light direction with structural and thermal challenges",
      "interpretation": "The bulk winner aligns with a major industry direction, but the literature also explains why pure LiNiO2 remains difficult in practice.",
      "references": [
        "https://www.osti.gov/pages/servlets/purl/1606408",
        "https://www.nature.com/articles/s41467-023-37775-4"
      ]
    },
    {
      "formula": "LiMnO2",
      "status": "historically known and newly relevant Ni/Co-free direction",
      "interpretation": "This is the most interesting convergence in the shortlist because the field has reopened LiMnO2 as a serious high-energy direction after earlier stability concerns.",
      "references": [
        "https://pubs.acs.org/doi/10.1021/acscentsci.4c00578"
      ]
    },
    {
      "formula": "Li4Ti5O12",
      "status": "best known as a zero-strain anode-class material",
      "interpretation": "The build-handoff result should be read as a strong stability and prototypeability signal, not as proof that the field missed an obvious next cathode.",
      "references": [
        "https://www.nature.com/articles/s41560-021-00829-2"
      ]
    }
  ],
  "key_findings": [
    "Bulk-only screening would have pushed the study toward LiNiO2.",
    "Interface analysis reopened LiMnPO4 and showed that the bulk-only conclusion was incomplete.",
    "Battery-native scoring elevated LiMnO2 once transport, degradation, cycle life, and manufacturability were considered together.",
    "Prototype handoff favored Li4Ti5O12 as the strongest immediate build candidate, showing that build-ready does not always mean highest-energy."
  ],
  "limitations": [
    "All values in this packet are computational predictions from FluxMateria, not lab measurements.",
    "The shortlisted materials are serious and useful engineering directions, but they are mostly known cathode families rather than proof of a brand-new chemistry class.",
    "The prototype-handoff recommendation is not a certification, safety sign-off, or manufacturing release decision."
  ],
  "next_steps": [
    "Build the top immediate prototype package around Li4Ti5O12 and run the first validation screen.",
    "Run the highest-information validation package on LiMnO2 to test whether its higher upside survives cell-level reality.",
    "Use the active-learning loop to feed early cycling, impedance, and dissolution data back into the ranking engine."
  ],
  "research_use_notice": "This public packet is for research and engineering evaluation only. It is not a manufacturing certification, safety sign-off, commercial qualification, or product release decision.",
  "access_note": "This public packet discloses formulas, headline metrics, dominant risks, and high-level build recommendations for known shortlist materials. Detailed build-sheet internals, raw result provenance, and non-public generated variants are not included."
}