Nano-Silicon-Carbon Composite Material, and Preparation Method and Application Thereof

Abstract

Provides are a nano-silicon-carbon composite material, and a preparation method and application thereof. The nano-silicon-carbon composite material includes silicon nanoparticles, closed pores, and a turbostratic graphite three-dimensional network structure; the closed pores have a pore volume inaccessible to N2, and the closed pores includes closed micropores; the turbostratic graphite three-dimensional network structure includes ultra-large interlayer spacing turbostratic graphite, and an interlayer spacing of the ultra-large interlayer spacing turbostratic graphite is 0.40 to 0.55 nm; and the silicon nanoparticles and the closed pores are dispersed in the turbostratic graphite three-dimensional network structure. The nano-silicon-carbon composite material effectively alleviates the volume expansion of silicon in a charge-discharge cycle, thereby improving the cycling stability of an electrode, and shows excellent electrochemical performance when applied to a lithium ion secondary battery.

Dependencies are inferred from the claim text.