Novel N-H-V-O Based Electrode Material for Secondary Batteries

Novel Triclinic Crystal Structure Ammonium Vanadium Bronze-Based Dual-Purpose Cathode Material for Lithium and Sodium Batteries

This technology involves the synthesis of a novel (NH4)2V7O16 vanadium bronze material with a triclinic (P-1) crystal structure, which is used as a cathode active material for lithium or sodium-ion batteries to improve ion intercalation and diffusion characteristics.

Existing (NH4)2V7O16 materials have been difficult to analyze in terms of crystal structure. In particular, sodium-ion batteries have faced limitations in achieving structural stability and cycle life due to the larger ionic volume and lower electrode potential of sodium compared to lithium.

This technology utilizes a hydrothermal synthesis method reacting NH4VO3 with LiBH4 to produce a novel triclinic (NH4)2V7O16 with lattice parameters of a=6.1480Å, b=6.1434Å, and c=18.0309Å, which is then formulated as an electrode active material by mixing it with conductive agents and binders in an 8:1:1 ratio. It can be applied to the development of next-generation sodium-ion energy storage systems and lithium-ion battery cathodes, allowing for the use of a single material for both battery systems while reducing dependence on lithium resources.

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Key Features:

• Electrode material for secondary batteries containing (NH4)2V7O16 with a triclinic (P-1) crystal structure and specific lattice parameters
• Working electrode for lithium-ion batteries containing (NH4)2V7O16, carbon, and polyvinylidene fluoride (PVDF) mixed in an 8:1:1 weight ratio
• Electrolyte for sodium-ion batteries composed of 1M NaPF6 dissolved in an EC:DEC solution with 2 wt% FEC added, used with a Na metal counter electrode
• A process involving dropping LiBH4 into an aqueous NH4VO3 solution and maintaining it in an autoclave at 200 to 300 °C for 12 to 18 hours

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