H_0.92K_0.08TiNbO₅ Nanowires Enabling High-Performance Lithium-Ion Uptake

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Potassium hexatitanate niobium oxide (HTiNbO₅) is known for its redox activity, photocatalysis, and environmental friendliness.
• One-dimensional nanostructures are desirable for energy storage applications due to their high surface area and efficient ion transport.

Purpose of the Study:

• To synthesize one-dimensional H_0.92K_0.08TiNbO₅ nanowires.
• To evaluate their performance as anode materials for lithium-ion batteries.

Main Methods:

• Electrospinning followed by an ion-exchange reaction for nanowire synthesis.
• Electrochemical testing (charge-discharge cycling, cyclic voltammetry) to assess battery performance.
• In situ X-ray diffraction and ex situ transmission electron microscopy to investigate the lithium storage mechanism.

Main Results:

• H_0.92K_0.08TiNbO₅ nanowires with a uniform diameter of ~150 nm were successfully synthesized.
• Initial charge capacity of 144.1 mA h g^-1 at 0.5 C, with a reversible capacity of 123.7 mA h g^-1 after 150 cycles (85.84% retention).
• High lithium-ion diffusion coefficient (1.97 × 10^-11 cm² s^-1) and proven structural stability during cycling.

Conclusions:

• The synthesized H_0.92K_0.08TiNbO₅ nanowires exhibit excellent electrochemical performance for lithium-ion batteries.
• The unique morphology and stable phase formation contribute to high capacity and long cycle life.
• These nanowires represent a viable alternative anode material for high-performance rechargeable batteries.