This technology introduces a one-step niobium modification that forms a LiNbO₃ surface layer and incorporates Nb⁵⁺ into nickel-rich layered cathodes (e.g., NMC 811). By simultaneously stabilizing the surface and bulk, it achieves higher first-cycle efficiency, faster charge rates, and dramatically improved cycling stability through a simple, scalable wet-chemistry process.
Nickel-rich cathodes like NMC 811 offer high energy density but are plagued by rapid degradation due to Li/Ni mixing, oxygen loss, impurity formation, and particle cracking. Conventional solutions—such as surface coatings or bulk dopants—often compromise performance by adding resistance, lowering first-cycle efficiency, or requiring complex, costly, and hard-to-scale processes. These limitations hinder the fast-charge and long-life performance needed for electric vehicles and grid-scale batteries.
The invention introduces a dual-action “coat-and-dope” process using niobium ethoxide. At low sintering temperatures (300–800 °C, O₂), the process forms a thin LiNbO₃ surface coating, while higher-temperature processing drives Nb⁵⁺ into the lattice, creating a Li₃NbO₄ interphase. This simultaneous surface and bulk stabilization reduces Li/Ni disorder, oxygen loss, Ni–O impurity formation, particle cracking, and surface Li₂CO₃. At practical areal loadings (~15 mg cm⁻²), prototype cells demonstrate ~50% lower irreversible first-cycle loss, strong 2C rate capability (~156 mAh g⁻¹), and ~97% capacity retention after 100 cycles (2.8–4.4 V).
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• One-step, scalable wet-chemistry process reduces capital and production cost
• Improves first-cycle Coulombic efficiency with ~50% less irreversible loss
• Strong fast-charge performance with ≈156 mAh g⁻¹ at 2C
• ~97% capacity retention after 100 cycles (2.8–4.4 V window)
• Functions at high areal loadings (~15 mg cm⁻²) suitable for EV-grade cells
• Simultaneously stabilizes surface and bulk via Nb coating + substitution
• Reduces Li/Ni mixing, oxygen loss, Ni–O impurity formation, and particle cracking
• Uses native Li₂CO₃ to form protective LiNbO₃, minimizing surface contaminants
• Extended-range EV battery packs with higher cycle life and usable energy
• Grid and renewable storage requiring fast-response and durable performance
• High-power aerospace and eVTOL batteries under strict weight/energy limits
• Consumer electronics with fast-charge requirements and long service life
• Industrial tools, robotics, and material handling with high cycle demand
• US Provisional 63/092,755 – Filed 10/16/2020 (Converted)
• PCT/US21/55328 – Filed 10/16/2021, Published WO 2022/082080 (05/12/2022), Status: Nationalized
• US Utility Application 18/030,868 – Filed 04/07/2023, Published US 2024-0228324 A1 (07/21/2024), Status: Filed
• EP Patent Application EP21881250.1 – Published EP 4229007 (11/01/2023), Status: Filed
• CA Patent 3,195,433 – Published 04/12/2023, Status: Filed
• JP Application 2023-548540 – Published 04/13/2023, Status: Filed
• KR Application 10-2023-7016516 – Published 05/16/2023, Status: Filed
• CN Application 2021800848610 – Published CN 116569351 A (06/15/2023), Status: Filed
Lab validation – Coin cells demonstrated reduced first-cycle loss, fast-charge capability, and extended cycling performance at practical electrode loadings. TRL ~4.
This technology is available for licensing.
Attractive to EV manufacturers, fast-charge infrastructure suppliers, and grid storage developers seeking cathodes with higher efficiency, faster charging, and extended cycle life.
Performance validation data, niobium modification protocols, and high-loading cell results are available upon request.