ZIF-8-derived Three-dimensional Silicon-carbon Network Composite for High-performance Lithium-ion Batteries

Lithium-ion batteries（LIBs） are widely applied to various portable electronic devices and new energy vehicles. However, the traditional graphite anode with low theoretical capacity（372 mAh/g） is unable to meet the need of the rapid development of economy and society. Herein, a zinc-based metallic organic framework（ZIF-8）derived three-dimensional network carbon coated silicon（Si@NC） composite was designed for lithium-ion battery.Firstly, the surface of nano-silicon was chemical modified; secondly, small size ZIF-8 was in situ grown on the silicon surface to form Si@ZIF-8; finally, the three-dimensional network Si@NC composite was obtained by carbonization. Results show that the three-dimensional network porous structure of the Si@NC composite not only limits the volume expansion of silicon, but greatly improves the conductivity of the materials, exhibiting excellent cycle stability and outstanding rate performance. As a result, a discharge specific capacity of 760 mAh/g is maintained at a high current density