Sodium-Ion Battery Patents

Sodium-ion battery patents cover cathode-chemistry innovations (layered oxide, Prussian blue, polyanionic); hard-carbon anode innovations; electrolyte and cell innovations; and pack/system innovations — with IP held by the lithium-battery giants entering Na-ion, dedicated sodium-ion specialists, and research-spinout companies. MAJOR SODIUM-ION PATENT HOLDERS: CATL (large estate): first-generation sodium-ion cells (Prussian-white cathode + hard carbon anode, ~160 Wh/kg first gen), the 'AB battery' pack architecture mixing Na-ion and Li-ion cells in one pack, and second-generation higher-energy designs. NATRON ENERGY: Prussian-blue-analogue chemistry on BOTH electrodes for very high power and extremely long cycle life (tens of thousands of cycles), fast charge, targeting data-center/industrial backup. FARADION (now Reliance): layered-transition-metal-oxide cathodes (Na-Ni-Mn-Mg-Ti O3/P2), hard carbon anodes, and a 'shorting'/zero-volt safe-transport feature; foundational European Na-ion IP. TIAMAT (France): polyanionic NVPF (Na3V2(PO4)2F3) cathode for high power and long life, cylindrical cells. OTHERS: HiNa Battery (China, Cu-Fe-Mn-based oxide, CAS spinout), BYD, Northvolt (hard carbon + Prussian white), Altris (Prussian-white, Sweden), KPIT/Sodion, and major cell makers adding Na-ion lines. Cathode chemistry and hard-carbon anode are the core sodium-ion patent domains.

Layered-transition-metal-oxide cathode innovations; Prussian-blue-analogue innovations; polyanionic cathode innovations; and cathode-stability and synthesis innovations represent core sodium-ion cathode patent domains — and the cathode chemistry choice defines a sodium-ion company's energy, power, and cost profile. LAYERED-OXIDE PATENTS: O3- and P2-type sodium transition-metal oxides (NaNiMnO, plus Fe, Cu, Ti, Mg dopants — Faradion, HiNa), composition tuning for capacity and air/moisture stability, suppression of phase transitions and voltage hysteresis, and surface coatings. PRUSSIAN-BLUE-ANALOGUE PATENTS: Prussian white/blue (sodium iron/manganese hexacyanoferrate) with controlled vacancies and low water content (water is the historic failure mode), high-rate and ultra-long-cycle designs (Natron, Altris), and synthesis routes. POLYANIONIC PATENTS: NVPF (Na3V2(PO4)2F3), NaVPO4F, fluorophosphates and pyrophosphates with stable open frameworks, high voltage, and long life (Tiamat), and carbon-coating for conductivity. STABILITY / SYNTHESIS PATENTS: air-stable and low-cost cathode synthesis, vacancy/water control (PBAs), dopant strategies, and scalable manufacturing. Cathode chemistry is the highest-value sodium-ion IP because it sets the fundamental energy/power/cost/lifetime trade-off and is where the major players have staked distinct positions (CATL/Northvolt/Altris on PBA, Faradion/HiNa on layered oxide, Tiamat on polyanionic).

Hard-carbon anode innovations; electrolyte and additive innovations; cell-design and current-collector innovations; and pack/system innovations represent additional sodium-ion patent domains — and the hard-carbon anode is a distinct, high-value sodium-ion-specific domain (graphite does not store sodium well). HARD-CARBON ANODE PATENTS: non-graphitizable 'hard carbon' for sodium storage (sloping + plateau capacity), precursor selection and pyrolysis (biomass, sugar, resin, anthracite-derived), pore-structure and closed-pore engineering for high capacity and low first-cycle loss (initial Coulombic efficiency is a key challenge), surface treatment, and low-cost scalable production. ELECTROLYTE PATENTS: sodium-salt electrolytes (NaPF6, NaFSI, NaClO4 in carbonate/ether solvents), additives for solid-electrolyte-interphase SEI stability, and wide-temperature (notably good cold-temperature) and non-flammable formulations. CELL / COLLECTOR PATENTS: aluminum current collectors on BOTH electrodes (sodium does not alloy with aluminum, unlike lithium — so no copper is needed, a real cost saver), zero-volt safe storage/transport, and cylindrical/prismatic/pouch designs. PACK / SYSTEM PATENTS: mixed Na-ion/Li-ion packs (CATL AB battery), BMS adapted for sodium-ion voltage curves, and thermal/safety systems leveraging sodium-ion's better thermal stability. The hard-carbon anode (capacity, initial efficiency, cost) and the all-aluminum-collector cell design are the most distinctive sodium-ion-specific IP.

Sodium-ion battery startup IP strategy must navigate CATL's large first/second-gen estate, Faradion layered-oxide patents (now Reliance), Natron and Altris Prussian-blue patents, Tiamat polyanionic patents, extensive lithium-ion prior art (much cell/pack engineering transfers), and a landscape where sodium-ion's appeal is cost/abundance/safety (cheap, cobalt/lithium-free, safe, good cold performance) rather than energy density; understand that the cathode chemistry family (layered oxide vs. PBA vs. polyanionic) is where the major players hold distinct, defensible positions, that the hard-carbon anode (capacity + initial Coulombic efficiency + cost) is a high-value sodium-ion-specific domain, and that the all-aluminum-collector cell is a structural cost advantage worth protecting; identify whitespace in air-stable low-cost cathodes, high-capacity high-efficiency hard carbon, and wide-temperature electrolytes. SODIUM-ION STARTUP IP STRATEGY: CATHODE CHEMISTRY + HARD-CARBON ANODE ARE THE IP: the cathode family (layered oxide, Prussian blue, polyanionic) and the hard-carbon anode are where sodium-ion value and freedom-to-operate concentrate — patent your specific composition, synthesis, and structure; HARD CARBON IS A DISTINCT HIGH-VALUE DOMAIN: graphite doesn't store sodium, so a high-capacity, high-initial-efficiency, low-cost hard carbon (precursor + pyrolysis + closed-pore structure) is both essential and patentable whitespace; PLAY THE COST/ABUNDANCE/SAFETY ANGLE, NOT ENERGY DENSITY: sodium-ion wins on cheap, cobalt/lithium-free, safe (no thermal runaway), all-aluminum-collector, cold-temperature — protect those structural advantages; AIR-STABLE CATHODES AND WIDE-TEMP ELECTROLYTES ARE OPEN: moisture/air-stable PBAs and layered oxides, and non-flammable wide-temperature electrolytes, are active terrain; WHEN TO PATENT: NOVEL MATERIAL/CELL WITH MEASURED PERFORMANCE: file once a material/cell shows measured results (specific capacity mAh/g + energy density Wh/kg + cycle life + initial Coulombic efficiency + cost $/kWh + low-temp retention) vs. layered-oxide or PBA baselines — measured energy density, cycle life, initial Coulombic efficiency, cost per kWh, and cold-temperature performance are the critical sodium-ion IP metrics; KEY FTO CHECKLIST: CATL Prussian-white + hard carbon, AB battery mixed pack; Faradion O3/P2 layered oxide Na-Ni-Mn-Mg-Ti zero-volt; Natron/Altris Prussian-blue-analogue both-electrode high-power; Tiamat polyanionic NVPF Na3V2(PO4)2F3; HiNa Cu-Fe-Mn oxide; hard carbon precursor/pyrolysis closed-pore initial-Coulombic-efficiency; NaPF6/NaFSI electrolyte SEI additive wide-temp; aluminum current collector both electrodes; lithium-ion cell/pack prior art.