Existing sodium-ion battery technologies face challenges related to low specific capacity and limited yield, hindering their commercial viability. There is a need for an efficient, cost-effective cathode material that delivers high energy density and prolonged cycle life for better full-cell performance.
This invention presents a new, efficient sodium-ion battery storage system utilizing chemically sodiated zirconium doped ammonium vanadium oxide as a cathode material. This novel battery technology offers a low-cost, high-energy-density solution with excellent cyclic stability, addressing the limitations of current sodium-ion battery technologies.
- Simple Synthesis: Single-step, low-temperature process using inexpensive materials like table salt and vanadium pentoxide, making it more cost-effective compared to traditional methods.
- High Energy Density: Achieves 220 Wh kg⁻¹ based on the total active mass of anode and cathode, comparable to commercial lithium-ion batteries.
- Superior Performance: Delivers high reversible storage capacity, excellent rate capability, and sustained 83% of initial capacity after 90 cycles with an average Coulombic efficiency of 99.58%.
- Versatility: The process can also be adapted for lithium-ion battery applications.
A 2032 type coin-cell was constructed in an argon-filled glove-box with pre-activated anode materials. Galvanostatic charge-discharge testing at 200 mA g⁻¹ over 1.25 V to 3.7 V showed a specific discharge capacity of 176 mAh g⁻¹ (cathode-based) and a nominal voltage of 2.5 V. The energy density was 440 Wh kg⁻¹ (cathode-based) and 220 Wh kg⁻¹ (total active mass). It retained 83% of initial capacity after 90 cycles with an average Coulombic efficiency of 99.58% and exhibited excellent rate capability.
The technology is in the prototype stage, with successful lab-scale demonstration of the full-cell performance. Galvanostatic charge-discharge testing of prototype at 200 mA g⁻¹ over 1.25 V to 3.7 V showed a specific discharge capacity of 176 mAh g⁻¹ (cathode-based) and a nominal voltage of 2.5 V. The energy density was 440 Wh kg⁻¹ (cathode-based) and 220 Wh kg⁻¹ (total active mass).
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This sodium-ion full cell battery technology provides a more sustainable and cost-effective alternative to lithium-ion batteries. It supports the transition to renewable energy sources and promotes the development of greener, more efficient energy storage solutions.
Battery Manufacturing, Energy storage solutions, Renewable energy sector
Energy storage, Electric Vehicles, Renewable energy integration
201921017610
525606