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

Abstract

The practical applications of SiO₂ anode material are limited by large volume changes and poor electronic conductivity. To reduce the effects of these problems, a carbon-coated coaxial cable-like ZnO@SiO₂@C composite material was prepared. ZnO has a certian electronic conductivity and an electrochemical activity, and the carbon layer can alleviate the volume variation of SiO₂, effectively improving the electronic conductivity and structural stability. At the same time, the carbon layer acts as a barrier to prevent direct contact between SiO₂ and the electrolyte, thus promoting the formation of stable solid electrolyte interface films. Carbon-coated coaxial cable-like ZnO@SiO₂@C exhibits excellent electrochemical properties, with a discharge specific capacity of 480.3 mAh g^-1 after 500 cycles at a current density of 1 A g^-1. The carbon-coated coaxial cable-like structure presents a potential application for alloying anode materials.