High Specific Capacity Amorphous Vanadium-Nickel Composite Lithium-Ion Battery Anode.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Amorphous vanadium pentoxide-tellurium dioxide (V2O5-TeO2) glasses show promise for lithium-ion battery anodes.
• However, these materials suffer from significant capacity loss and poor retention in the initial cycles.

Purpose of the Study:

• To enhance the electrochemical performance of V2O5-TeO2 based glasses for lithium-ion battery anodes.
• To address the issues of initial capacity loss and low capacity retention.

Main Methods:

• Incorporation of nickel oxide/nickel selenide (NiO/NiSe) into the V2O5-TeO2 glass system.
• Electrochemical characterization including specific capacity, capacity retention, and electrochemical impedance spectroscopy.
• Density functional theory (DFT) simulations to investigate electronic properties and lithium adsorption.

Main Results:

• The V5+ content decreased significantly, while V4+ and V3+ content increased, indicating a redox transformation.
• Initial specific capacity rose from 699.8 to 1048.5 mAh/g.
• Electrochemical impedance decreased from 648 to 242 Ω, and conductivity increased by 12.5%.

Conclusions:

• NiO/NiSe incorporation effectively mitigates initial capacity loss and improves capacity retention in V2O5-TeO2 anodes.
• The modified semiconductor material exhibits enhanced lithium storage properties due to improved conductivity and reduced impedance.
• This study presents a novel strategy for optimizing glass-based materials for advanced lithium-ion batteries.