This invention introduces an ε-VOPO₄-based lithium-ion cathode that achieves its full theoretical capacity of 305 mAh/g with 98% coulombic efficiency. Using a novel slurry formulation and scalable electrode production method, it delivers high-capacity, stable, and cost-effective energy storage with simplified dual-voltage operation.
Lithium-ion batteries power nearly every modern device, from electric vehicles to grid storage. Yet current cathode materials are constrained by structural degradation, low practical capacity, and expensive manufacturing processes. Leading options such as LCO, LFP, and NMC are limited in either energy density or cost-effectiveness, while reliance on cobalt and nickel creates supply chain vulnerabilities. A breakthrough cathode material is needed to combine high capacity, cycling stability, and scalable, low-cost manufacturing.
This invention introduces a cathode material based on the epsilon polymorph of vanadyl phosphate (ε-VOPO₄), synthesized solvothermally from H₂VOPO₄. The 3D tunnel crystal structure enables reversible intercalation of two lithium ions per vanadium atom, supporting a theoretical capacity of 305 mAh/g. Voltage plateaus at ~4.0 V and ~2.5 V provide dual-mode operation. Niobium particle surface modification enhances cycling stability, while a proprietary slurry formulation and electrode fabrication method improve electrode integrity and manufacturing scalability. Demonstrated in coin cell prototypes, the system achieves 98% coulombic efficiency with superior energy density compared to conventional cathodes.
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• High specific capacity of 305 mAh/g, surpassing LCO, LFP, and NMC cathodes
• Two-electron redox reaction enhances charge storage capability
• 98% coulombic efficiency supports long cycle life and high energy retention
• Improved cycling stability through niobium particle modification
• Dual voltage plateaus enable simplified dual-mode power systems
• Enhanced safety and thermal stability due to phosphate chemistry
• Cost-effective production—cobalt- and nickel-free composition reduces material risk
• Proprietary slurry improves electrode quality and scalability
• High-energy-density batteries for electric vehicles and drones
• Cost-effective stationary energy storage for grid applications
• Dual-mode power systems for medical and defense electronics
• Consumer electronics needing longer run times in compact designs
• Lithium-ion component manufacturing for integration into global supply chains
• US Utility Patent Application 18/447,267 – Filed August 9, 2023
• US Published Application US 2024/0006611 A1 – Published March 5, 2024
Lab validation – Coin cell prototypes demonstrated full theoretical capacity, dual-voltage operation, and long-term cycling stability. TRL ~4.
This technology is available for licensing.
Ideal for adoption by battery manufacturers, EV suppliers, and grid storage providers seeking next-generation cathode materials that combine energy density, safety, and cost-effectiveness with scalable production.
Prototype performance data, cycling stability results, and slurry formulation details available upon request.