Carbon-Coated Coaxial Cable-like ZnO@SiO₂@C for High-Performance Lithium-Ion Battery Anode Materials

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Silicon dioxide (SiO₂) is a promising anode material for batteries.
• Its practical application is hindered by significant volume changes during cycling and poor electronic conductivity.
• These issues lead to capacity fading and reduced battery lifespan.

Purpose of the Study:

• To engineer a composite material that mitigates the drawbacks of SiO₂ anodes.
• To enhance the electrochemical performance and structural stability of SiO₂-based anodes.
• To explore the potential of a novel carbon-coated coaxial cable-like structure for alloying anode materials.

Main Methods:

• Preparation of a carbon-coated coaxial cable-like ZnO@SiO₂@C composite material.
• Characterization of the material's structure and electrochemical properties.
• Evaluation of cycling stability and specific capacity at a defined current density.

Main Results:

• The ZnO@SiO₂@C composite demonstrated improved electronic conductivity and structural integrity.
• The carbon coating effectively buffered SiO₂ volume expansion and prevented direct electrolyte contact.
• The material achieved a high discharge specific capacity of 480.3 mAh g^-1 after 500 cycles at 1 A g^-1.

Conclusions:

• The developed carbon-coated coaxial cable-like ZnO@SiO₂@C material significantly enhances the electrochemical performance of SiO₂ anodes.
• This innovative structure offers a viable strategy for developing high-performance alloying anode materials for next-generation batteries.
• The improved stability and conductivity pave the way for practical applications of SiO₂ in energy storage devices.