Fluoride-Ion Battery Patents

Fluoride-ion battery patents cover fluoride-electrolyte innovations; conversion-electrode innovations; interface and cell-design innovations; and IP strategy — with IP held by automotive research institutes, national labs and universities, and electrolyte/materials groups. WHY FLUORIDE-ION BATTERIES: a FLUORIDE-ION BATTERY (FIB) is a BEYOND-LITHIUM chemistry where the charge carrier is the FLUORIDE ANION (F-) shuttling between two electrodes, instead of a metal CATION like Li+; because fluoride reactions can be MULTI-ELECTRON via metal-fluoride CONVERSION chemistry (broadly, metal + xF- <-> metal-fluoride, transferring several electrons per metal atom), FIBs have a very high THEORETICAL ENERGY DENSITY — potentially EXCEEDING lithium-ion — while using ABUNDANT, NON-FLAMMABLE materials, which is exactly why they attract interest as a next-generation high-energy storage chemistry; the original work relied on SOLID-STATE fluoride electrolytes (fluoride-conducting ceramics) that only carry F- at HIGH TEMPERATURE (well above room temperature), which made practical cells impractical, so a key breakthrough was demonstrating a ROOM-TEMPERATURE LIQUID fluoride electrolyte (a dissolved fluoride salt with anion-stabilizing chemistry) that conducts F- at room temperature and finally opened the door to room-temperature FIB cells; the brutal CHALLENGES are honest and severe — the fluoride ELECTROLYTE must conduct F- well at ROOM TEMPERATURE and be electrochemically and chemically STABLE; the CONVERSION electrodes undergo huge VOLUME CHANGE during fluorination/defluorination and suffer poor REVERSIBILITY and cycle life; and the INTERFACES between electrode and electrolyte must be stabilized; FIB is EARLY-STAGE R&D, far LESS MATURE than lithium-ion, so demonstrated REVERSIBILITY, room-temperature CYCLING, and CYCLE LIFE are the real questions, not just theoretical energy density. MAJOR PLAYERS: HONDA RESEARCH INSTITUTE, the CALIFORNIA INSTITUTE OF TECHNOLOGY (CALTECH) and NASA's JET PROPULSION LABORATORY (JPL) collaboration, and TOYOTA / TOYOTA RESEARCH INSTITUTE, plus university and electrolyte/materials groups. Electrolyte, electrodes/conversion, interfaces/cell, and FTO are the core FIB patent domains. (Note: ELECTROLYTES and ELECTRODES (composition), CELLS (device), and PROCESSES are §101-RESILIENT — so claim electrolytes, electrodes, cells, and processes.)

Fluoride-electrolyte innovations; solid-state-electrolyte innovations; room-temperature-liquid-electrolyte innovations; and fluoride-conductor innovations represent core fluoride-ion-battery patent domains — and the fluoride electrolyte is the foundational, MAKE-OR-BREAK, §101-resilient capability, because a battery that cannot move F- at room temperature simply does not work. FLUORIDE-ELECTROLYTE PATENTS: the MAKE-OR-BREAK — SOLID-STATE FLUORIDE ELECTROLYTE (fluoride-conducting solids such as DOPED METAL FLUORIDES and TYSONITE-TYPE structures (e.g., rare-earth fluoride lattices) where dopants create fluoride vacancies that let F- hop through the lattice; the historic limitation is that these conduct F- well only at ELEVATED TEMPERATURE, so raising room-temperature CONDUCTIVITY is the central problem), ROOM-TEMPERATURE LIQUID ELECTROLYTE (a dissolved FLUORIDE SALT in an organic solvent with ANION STABILIZATION — solvent/salt/additive chemistry that keeps F- mobile and the electrolyte stable at ROOM TEMPERATURE — the breakthrough that made room-temperature FIBs conceivable), CONDUCTIVITY (raising fluoride-ion conductivity at room temperature, the gating metric), and STABILITY WINDOW (electrochemical and chemical stability so the electrolyte survives the strongly reducing/oxidizing conversion electrodes without decomposing); fluoride-electrolyte methods are core, high-value, DISTINCTIVE composition IP, §101-resilient (solid-state fluoride conductors, room-temperature liquid fluoride electrolytes, conductivity, and stability windows are the central, contested, defensible IP, since the electrolyte is literally what decides whether F- can shuttle at room temperature at all — the make-or-break). SOLID-STATE-ELECTROLYTE PATENTS: doped-metal-fluoride and tysonite-type fluoride conductors with higher room-temperature conductivity; solid-state-electrolyte methods are high-value composition IP, §101-resilient (the solid conductor is the classic fluoride electrolyte path). ROOM-TEMPERATURE-LIQUID-ELECTROLYTE PATENTS: fluoride salts in solvents with anion stabilization for room-temperature F- conduction; room-temperature-liquid-electrolyte methods are high-value composition IP, §101-resilient (the liquid electrolyte is the room-temperature breakthrough). FLUORIDE-CONDUCTOR PATENTS: materials and formulations that maximize F- mobility and stability; fluoride-conductor methods are high-value composition IP, §101-resilient (fluoride conduction is the crux). Fluoride-electrolyte, solid-state-electrolyte, room-temperature-liquid-electrolyte, and fluoride-conductor are the highest-value core IP because the fluoride electrolyte is exactly what determines whether an FIB can operate at room temperature.

Conversion-electrode innovations; interface innovations; cell-design innovations; and reversibility innovations represent additional fluoride-ion-battery patent domains — and the conversion electrodes (the energy) and the interfaces/cell (the durability) turn the fluoride electrolyte into a working, cyclable battery. CONVERSION-ELECTRODE PATENTS: the ENERGY — METAL AND METAL-FLUORIDE CONVERSION ELECTRODES (electrodes that store charge by CONVERSION — a metal taking up fluoride to form a metal-fluoride and releasing it on the reverse — which transfers MULTIPLE ELECTRONS per metal atom and is the source of FIB's high theoretical ENERGY DENSITY), CORE-SHELL / NANOSTRUCTURED DESIGNS (nanostructured, core-shell, or buffered electrode architectures that accommodate the huge VOLUME CHANGE of fluorination/defluorination, maintain electrical contact, and improve REVERSIBILITY and cycle life), HIGH-ENERGY-DENSITY COUPLES (selecting the metal/metal-fluoride couples and cathode/anode pairings that maximize voltage and capacity), and REVERSIBILITY (the central electrode problem — making conversion reversible enough to cycle many times without capacity fade); conversion-electrode methods are core, high-value, DISTINCTIVE composition/device IP, §101-resilient (metal/metal-fluoride conversion electrodes, core-shell/nanostructured volume-change management, high-energy-density couples, and reversibility are core, contested, defensible IP, since the conversion electrode is where FIB's energy-density advantage lives — and where its reversibility/cycle-life problem is hardest). INTERFACE & CELL-DESIGN PATENTS: the DURABILITY — ELECTRODE-ELECTROLYTE INTERFACE STABILIZATION (managing the interface where fluoride transfers, including passivation and side-reaction control so the electrolyte and electrode do not degrade each other), COATINGS (protective or functional coatings on electrodes/particles to stabilize the interface and buffer volume change), FULL-CELL ARCHITECTURE (assembling anode, electrolyte, and cathode into a working cell with stable contact, managed volume change, and practical packaging), and CYCLE LIFE (the device-level outcome — getting from a few cycles toward a practically useful cycle life); interface and cell-design methods are core, high-value, DISTINCTIVE device/process IP, §101-resilient (interface stabilization, coatings, full-cell architecture, and volume-change/cycle-life management are core, contested, defensible IP, since the interfaces and cell design are where reversibility and durability are won or lost). CELL-DESIGN PATENTS: full-cell architectures that manage volume change and stabilize interfaces; cell-design methods are high-value device IP, §101-resilient (the cell turns materials into a battery). REVERSIBILITY PATENTS: electrode/interface designs that make conversion reversible across many cycles; reversibility methods are high-value IP, §101-resilient (reversibility is the central cycle-life problem). Conversion-electrode, interface, cell-design, and reversibility are the highest-value IP because the conversion electrode sets the energy density and the interfaces/cell decide whether that energy can be cycled.

Fluoride-ion battery startup IP strategy must navigate the electrolyte-electrodes-cell-and-process-are-§101-resilient (FIB IP is ELECTROLYTE + ELECTRODE (composition), CELL (device), and PROCESS IP — strongly §101-RESILIENT — so electrolyte, conversion-electrode, interface, and cell claims are strong), the fluoride-electrolyte-is-the-make-or-break (the battery does not work unless F- moves at ROOM TEMPERATURE and the electrolyte is stable, so solid-state fluoride conductors, ROOM-TEMPERATURE LIQUID fluoride electrolytes, conductivity, and stability windows are the single most decisive IP — without the electrolyte there is no FIB), the conversion-electrode-is-the-energy-and-the-reversibility-problem (metal/metal-fluoride CONVERSION electrodes deliver MULTI-ELECTRON, high THEORETICAL ENERGY DENSITY — the whole reason for FIB — but suffer huge VOLUME CHANGE and poor REVERSIBILITY, so core-shell/nanostructured designs and reversible couples are a high-value, defensible frontier), the interfaces-and-cell-decide-durability (electrode-electrolyte INTERFACE stabilization, coatings, and full-cell architecture managing volume change are where CYCLE LIFE is won — claimable device/process IP), the high-energy-density-from-abundant-non-flammable-materials-is-the-architectural-advantage (FIB's defining promise is very high energy density (potentially exceeding lithium-ion) from ABUNDANT, NON-FLAMMABLE materials — a genuine differentiator, though it is a PROMISE that depends on solving reversibility and room-temperature cycling), the room-temperature-operation-was-the-key-unlock (early FIBs only worked at HIGH TEMPERATURE on solid electrolytes; the ROOM-TEMPERATURE LIQUID electrolyte was the breakthrough, so room-temperature operation and its electrolyte chemistry are central, defensible IP), the early-stage-vs-lithium-is-the-honest-competition (be honest: FIB is EARLY-STAGE R&D, far LESS MATURE than lithium-ion — it promises higher energy density and safer, abundant materials but has NOT proven long cycle life or reversibility at scale, so demonstrated room-temperature CYCLING, REVERSIBILITY, and CYCLE LIFE matter as much as patents, and lithium remains the mature incumbent), the composition-is-the-dominant-defensible-IP (electrolyte and electrode COMPOSITION are the strongest, most defensible FIB IP — the materials are the moat), the volume-change-management-is-a-clean-place-to-differentiate (core-shell/nanostructured/buffered electrode designs that survive fluorination volume change are a concrete, claimable differentiator), the electrolyte-vs-electrode-vs-cell-business-models (a startup can focus on the ELECTROLYTE (materials), the ELECTRODES/active materials, or full CELLS — different IP and capital needs), the incumbent-and-FTO (Honda Research Institute, Caltech/JPL, and Toyota / Toyota Research Institute hold significant early FIB IP, so a startup needs a genuinely novel electrolyte/electrode/cell edge and FTO), and the demonstrated-room-temperature-cycling-reversibility-energy-density-and-cycle-life-decide (FIB is proven by demonstrated room-temperature CYCLING, REVERSIBILITY, ENERGY DENSITY, and CYCLE LIFE — so demonstrated, honest data versus lithium are decisive, more than patents alone), and a landscape where electrolyte, electrodes/conversion, interfaces/cell, and process are the durable assets; understand that the fluoride electrolyte is the make-or-break and the conversion electrode is both the energy and the reversibility problem, so the durable startup IP is in room-temperature fluoride electrolytes (solid or liquid), reversible conversion electrodes with managed volume change, and stable interfaces/cells — with a working room-temperature electrolyte or a reversible high-energy electrode often the real moat, and that §101-resilient electrolyte/electrode/cell IP, demonstrated reversibility/cycle-life, and FTO matter as much as patents; identify whitespace in room-temperature fluoride conductors, volume-change-tolerant electrodes, and interface stabilization. FLUORIDE-ION BATTERY STARTUP IP STRATEGY: ELECTROLYTE, ELECTRODES, INTERFACES/CELL, AND PROCESS ARE THE IP: patent fluoride electrolytes, conversion electrodes, interfaces, and cells — composition + device + process claims (§101-resilient); ELECTROLYTE-ELECTRODES-CELL-AND-PROCESS-ARE-§101-RESILIENT: ELECTROLYTE + ELECTRODE (composition) + CELL (device) + PROCESS IP — strongly §101-RESILIENT; FLUORIDE-ELECTROLYTE-IS-THE-MAKE-OR-BREAK: F- must move at ROOM TEMPERATURE and be stable — solid-state fluoride conductors + ROOM-TEMPERATURE LIQUID electrolytes + conductivity + stability windows the single most decisive IP; CONVERSION-ELECTRODE-IS-THE-ENERGY-AND-THE-REVERSIBILITY-PROBLEM: metal/metal-fluoride CONVERSION delivers MULTI-ELECTRON high ENERGY DENSITY but huge VOLUME CHANGE + poor REVERSIBILITY — core-shell/nanostructured designs + reversible couples a high-value frontier; INTERFACES-AND-CELL-DECIDE-DURABILITY: INTERFACE stabilization + coatings + full-cell architecture managing volume change set CYCLE LIFE; HIGH-ENERGY-DENSITY-FROM-ABUNDANT-NON-FLAMMABLE-MATERIALS-IS-THE-ARCHITECTURAL-ADVANTAGE: very high energy density (potentially exceeding lithium-ion) from ABUNDANT, NON-FLAMMABLE materials — a genuine promise dependent on reversibility; ROOM-TEMPERATURE-OPERATION-WAS-THE-KEY-UNLOCK: early FIBs needed HIGH TEMPERATURE on solid electrolytes — the ROOM-TEMPERATURE LIQUID electrolyte was the breakthrough; EARLY-STAGE-VS-LITHIUM-IS-THE-HONEST-COMPETITION: FIB is EARLY-STAGE, far LESS MATURE than lithium — promises higher energy density + safe abundant materials but unproven cycle life/reversibility at scale, so demonstrated room-temperature CYCLING/REVERSIBILITY/CYCLE LIFE matter as much as patents; COMPOSITION-IS-THE-DOMINANT-DEFENSIBLE-IP: electrolyte + electrode COMPOSITION the strongest moat; VOLUME-CHANGE-MANAGEMENT-IS-A-CLEAN-PLACE-TO-DIFFERENTIATE: core-shell/nanostructured/buffered electrodes that survive fluorination volume change; ELECTROLYTE-VS-ELECTRODE-VS-CELL-BUSINESS-MODELS: focus on ELECTROLYTE materials, ELECTRODES/active materials, or full CELLS — a key choice; INCUMBENT-AND-FTO: Honda Research Institute/Caltech-JPL/Toyota-Toyota Research Institute hold early FIB IP — need a novel edge + FTO; DEMONSTRATED-ROOM-TEMPERATURE-CYCLING-REVERSIBILITY-ENERGY-DENSITY-AND-CYCLE-LIFE-DECIDE: proven by demonstrated room-temperature CYCLING + REVERSIBILITY + ENERGY DENSITY + CYCLE LIFE vs lithium — honest data decisive; WHEN TO PATENT: NOVEL ELECTROLYTE/ELECTRODE/CELL WITH DATA: file once it shows data (electrolyte room-temperature conductivity/stability + electrode reversibility/volume-change + cell cycle life) — composition + device + process claims; demonstrated room-temperature cycling, reversibility, energy density, and cycle life are the critical FIB IP metrics; KEY FTO CHECKLIST: Honda Research Institute/Caltech-JPL/Toyota-Toyota Research Institute + university and materials groups; electrolyte (SOLID-STATE fluoride conductor — doped metal fluorides/tysonite-type / ROOM-TEMPERATURE LIQUID fluoride salt + anion stabilization / conductivity / stability window — §101-resilient, the make-or-break); electrodes (metal/metal-fluoride CONVERSION / core-shell-nanostructured volume-change management / high-energy-density couples / REVERSIBILITY — §101-resilient, the energy + the reversibility problem); interfaces & cell (interface stabilization / coatings / full-cell architecture / cycle life — §101-resilient, the durability); reversibility; electrolyte + electrode + cell + process the §101-resilient strength; fluoride electrolyte the make-or-break; conversion electrode the energy + reversibility problem; interfaces + cell decide durability; high energy density from abundant + non-flammable materials the architectural advantage; room-temperature operation the key unlock; early-stage vs lithium the honest competition; composition the dominant defensible IP; volume-change management a clean place to differentiate; electrolyte vs electrode vs cell business models; incumbent + FTO; demonstrated room-temperature cycling + reversibility + energy density + cycle life decide.