A novel embedded KVO₃/NC anode for high-performance lithium-ion batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Vanadium-based metallic salts suffer from low electronic conductivity, hindering their use as anode materials in lithium-ion batteries.
• Developing advanced anode materials is crucial for improving battery performance and energy density.

Purpose of the Study:

• To synthesize and characterize a novel embedded anode material, KVO3/NC, for enhanced lithium-ion battery applications.
• To improve the electronic conductivity and electrochemical performance of vanadium-based anode materials.

Main Methods:

• Sol-gel synthesis to create KVO3 particles in situ on N-doped carbon (KVO/NC).
• Electrochemical testing to evaluate cycling stability and rate performance.
• Ex situ and in situ characterizations to understand storage mechanisms.

Main Results:

• KVO/NC composite exhibits three distinct lithium-ion storage sites.
• Achieved ultra-high cycling stability (289 mAh/g at 5000 cycles at 10C).
• Demonstrated superior rate performance (249 mAh/g at 15C, 221 mAh/g at 20C).

Conclusions:

• KVO/NC shows practical potential as a high-energy-density, long-cycle-life anode material for lithium-ion batteries.
• The in situ growth on N-doped carbon effectively enhances conductivity and electrochemical properties.
• Coupling with LiFePO4 cathode yields competitive energy density (391 Wh/kg at 0.1C).