TiNb2O7 Lithium Secondary Battery Anode Material and Manufacturing Method Thereof

TNO Anode Material with Carbon-Doped Porous Structure via Controlled Calcination (550–800°C) Sol-Gel Synthesis

This technology precisely controls the calcination temperature between 550°C and 800°C during the manufacturing of TiNb2O7 (TNO) anode materials to simultaneously achieve a crystalline and porous structure while doping the interior with carbon (C).

Conventional TiNb2O7-based anode materials suffer from low electron/ion conductivity and lithium-ion diffusion coefficients, leading to poor cycle stability and rate capability. Furthermore, existing synthesis processes are complex and delicate, making mass production difficult.

This technology uses a sol-gel method to react Ti and Nb sources to create a base precursor, which is then calcined between 550°C and 800°C to synthesize a porous TNO anode with a pore volume of 0.114–0.120 cm³/g and 0.09–0.42 wt% carbon doping. Applicable to fast-charging EV cells, high-safety graphite-alternative anodes, and industrial AGV batteries, it enables conductivity enhancement and pore formation in a single calcination step without requiring a separate carbon coating process.

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Key Features:

• Preparing a base solution by injecting and stirring titanium butoxide and niobium ethoxide into ethylene glycol under a nitrogen atmosphere
• Adding an acetone and distilled water initiator to the base solution for a sol-gel reaction, followed by washing and drying to produce spherical base precursors
• Calcining the base precursors in an atmospheric environment at 550°C to 800°C for 2 hours to obtain a crystalline TiNb2O7 structure
• Porous TiNb2O7 structure with a total pore volume of 0.114–0.120 cm³/g and carbon content of 0.09–0.42 wt%, controlled by the calcination temperature

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This invention was developed with support from the Ministry of Science and ICT for research on the correlation between the physical properties of atomic-level controlled metal nanoclusters and their photoelectrochemical behavior.

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