{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp09_archetype_breadth150_20260804","cell_id":"negative_space_design__chemistry_materials","arm":"BREADTH_PROBE_ONE_SHOT","candidate_id":"negative_space_design__chemistry_materials__P1","proposal_index":1,"version":0,"title":"Protected Electrolyte Corridors in Thick Porous Electrodes","problem":"In a thick, high-solid-loading porous battery electrode, active particles, conductive additive, and binder can occupy nearly every available region while leaving only tortuous, poorly connected electrolyte pathways. The electrochemically active material is present, but parts of it are difficult to reach during a charge or discharge pulse because solid content crowds the transport field.","actors":["Electrode materials scientist","Electrode process engineer","Electrochemical test technician","Cell safety and reliability reviewer"],"observable_state":"Cross-sectional imaging shows a dense electrode with long or constricted through-thickness pore paths; during rate testing, polarization rises and reaction or state-of-charge changes concentrate nearer the separator while material nearer the current collector remains less utilized.","consequence":"Uneven ionic access produces a nonuniform reaction front, increases polarization, and leaves some active material unavailable during the intended operating interval; attempts to add more active solid can therefore increase nominal loading without proportionally increasing usable output under that interval.","affected_objective":"Make a thick electrode's existing active-material volume electrochemically accessible during a specified charge or discharge interval while retaining electronic connectivity, mechanical integrity, and safety context.","intervention":"Pattern the coating with periodic, through-thickness zones from which active particles and binder are deliberately omitted, creating electrolyte-filled corridors between load-bearing active-material ribs. Define channel width, spacing, and termination explicitly; prevent calendering or later coating steps from closing or filling them; retain ordinary distributed microporosity within the ribs; and mark the corridors as intentional transport structures rather than cracks. Test whether the bounded absence makes ionic access to the surrounding positive material more uniform.","structural_mapping":[{"archetype_element":"Omission Candidate","domain_realization":"Selected coating lanes omit active particles and binder while preserving conductive and mechanically supporting material in the neighboring electrode ribs."},{"archetype_element":"Attention Competition Map","domain_realization":"A through-thickness transport map identifies where active solid, binder, and conductive additive compete with electrolyte volume and constrict ion paths."},{"archetype_element":"Protected Empty Space","domain_realization":"Aligned electrolyte corridors are reserved against slurry intrusion, calendering closure, and later filler deposition."},{"archetype_element":"Positive Form Relationship","domain_realization":"Each corridor is dimensioned in relation to adjacent active-material ribs so the empty lane serves their ionic access rather than becoming unused volume."},{"archetype_element":"Absence Boundary","domain_realization":"Specified channel width, pitch, depth, edge setback, and termination distinguish the designed void from uncontrolled cracking or delamination."},{"archetype_element":"Meaning-of-Absence Check","domain_realization":"Imaging, wetting tests, and mechanical inspection determine whether the void reads physically as a connected electrolyte pathway rather than a dry pocket, coating defect, or separator-threatening gap."},{"archetype_element":"Clarity or Effect Test","domain_realization":"Matched-loading patterned and unpatterned electrodes are compared for channel persistence, through-thickness wetting, polarization, and reaction-uniformity indicators."},{"archetype_element":"Accessibility and Recoverability Guardrail","domain_realization":"Required separator support, edge insulation, current-collector adhesion, electronic continuity, and standard safety controls remain intact; the pattern is confined to removable laboratory coupons."}],"mechanism_mapping":[{"mechanism_slug":"architectural_void","role":"Uses deliberately unoccupied, connected coating volume to organize electrolyte movement and the relation among surrounding active-material regions.","counterfactual_removal":"If the corridors are filled with the same electrode solids, the intervention loses its protected transport absence and becomes the ordinary dense coating."},{"mechanism_slug":"margin_and_gutter_system","role":"Applies a repeated pitch and width rule to keep active-material ribs separated by consistent transport gutters across the electrode.","counterfactual_removal":"Without the spacing rule, voids become irregular defects whose relation to adjacent active material and transport distance cannot be controlled."}],"causal_chain":["A dense thick coating crowds electrolyte pathways with active particles, binder, and conductive additive.","Crowded, tortuous paths impose uneven ionic access across the electrode thickness during the specified operating interval.","Deliberately omitted coating lanes create bounded, connected negative space that remains available to electrolyte.","The corridors shorten lateral transport distance from bulk electrolyte to active material in neighboring ribs while ordinary micropores carry ions within each rib.","More even ionic access should produce a more uniform reaction front and reduce transport-associated polarization if transport crowding is the operative limitation.","Matched controls test whether the designed absence, rather than reduced active mass or an unrelated process change, accounts for the observed difference."],"baseline":"A composition-matched electrode coated continuously at the same footprint and target active mass, using the ordinary drying and calendering process and relying only on its distributed stochastic porosity.","nearest_rivals":["Increase uniform porosity by reducing calendering pressure","Add a sacrificial pore former to create stochastic pores throughout the coating","Use a thinner continuous electrode with lower areal loading","Change electrolyte composition to increase ionic conductivity","Grade porosity or particle size continuously through the electrode thickness"],"remaining_contrastive_claim":"The candidate concentrates deliberately absent solid into bounded, connected transport corridors that are explicitly related to surrounding active ribs and protected from later filling. Unlike general porosity increases, thinner coatings, or electrolyte changes, its operative variable is the placement and preservation of empty volume rather than a uniform reduction of density or a change in chemistry.","authority_safety":{"decision_authority":"The laboratory principal investigator and designated electrode-process owner may authorize coupon fabrication and electrochemical testing under the institution's existing cell-assembly and materials-safety procedures; the safety reviewer may veto the pattern if it compromises separator support or containment.","authorized_first_step":"Fabricate only small laboratory coupons of the existing approved electrode chemistry, using a removable masking or patterned-coating step, and inspect them before any cell assembly.","excluded_actions":["Production-line changes","Scale-up beyond laboratory coupons","Substitution of an unapproved active material, binder, solvent, electrolyte, or separator","Bypassing dry-room, ventilation, personal-protective-equipment, formation, or cell-containment procedures","Cycling a coupon with visible delamination, loose particles, sharp channel edges, or inadequate separator support"],"halt_rollback":"Stop if channels collapse, remain dry, cause particle shedding or delamination, create separator-support concerns, or materially increase initial impedance. Return to the continuous-coating baseline, quarantine affected cells, and dispose of or recover materials under the existing laboratory procedure."},"negative_tests":{"strongest_counterevidence":"Through-thickness imaging or spatially resolved electrochemical measurements show that the baseline electrode is already uniformly wetted and utilized, while its polarization is instead explained by electronic resistance, interfacial kinetics, or active-material diffusion.","problem_falsifier":"At the specified operating interval, a thickness-matched continuous electrode shows no meaningful through-thickness gradient in electrolyte access, potential, reaction state, or utilization relative to a thin reference.","intervention_falsifier":"At matched active mass and chemistry, persistent wetted corridors do not change the transport-associated gradient or polarization relative to the continuous control, or any apparent change disappears after accounting for mass, thickness, compression, and contact resistance.","risks":["The corridors reduce volumetric active-material density without resolving the limiting transport process.","Calendering, electrolyte wetting, or cycling closes or fills the protected voids.","Channel edges concentrate mechanical stress and initiate cracking or delamination.","Large voids weaken separator support or promote nonuniform current distribution.","Corridors wet poorly and become trapped-gas pockets rather than transport paths.","Patterning changes coating thickness, compression, adhesion, or conductive connectivity, confounding attribution.","A visually clean channel pattern is mistaken for functional evidence before electrochemical validation."]},"next_evidence_step":"Prepare three patterned and three continuous 1-square-centimeter coupons from one approved slurry batch at matched active mass and overall thickness. Before cycling, use cross-sectional imaging and a wetting tracer or equivalent established laboratory method to verify that the corridors remain open and electrolyte-accessible. Assemble only the laboratory's standard contained test cells, apply one predefined low-rate/high-rate pulse sequence, and compare impedance plus a through-thickness utilization indicator. Proceed no further unless the voids persist, wet correctly, and show a transport-linked difference without loss of adhesion or separator support.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not assessed against other proposals because runtime isolation prohibits inspecting them; this candidate was derived solely from the supplied archetype and domain card.","revision_record":{"parent_version":null,"progress_targets_addressed":[],"conceptual_changes":[],"operational_changes":[],"evidence_changes":[],"claim_changes":[]}}