Zif-Derived Twisted Wedge-Shaped Cos2/Nc Nanoporous Architectures Pinned to Graphene Foam as Anode for Lithium and Sodium-Ion Batteries

Abstract

To explore more efficient ways to deal with deteriorating environmental problems, lithium-ion and sodium-ion batteries are expected to serve as advanced energy storage equipment for green energy. Herein, ZIF-L derived CoS 2 with N-doped porous carbon framework carried by three-dimensional (3D) N-doped porous graphene (CoS 2 /NC@NPG) is prepared by a facile method in deionized water, followed by carbonization and vulcanization. The composite delivers remarkable rate performance as anode for lithium-ion batteries (527 mAh/g at 10 A/g) and sodium-ion batteries (386 mAh/g at 10 A/g). The excellent performance is mainly ascribed to the abundant wrinkles with active sites on the rough surface of twisted wedge-shaped carbon frame, which is related with excellent rate capability. The porous carbon framework derived from ZIF-L and NPG supporter provides fast ion channels and improved conductivity. The carbon coating where CoS 2 uniformly distributed in can accommodate the volume expansion during the cycling, thereby boosting the capacity storage and cyclic stability.

Keywords: CoS2, N-doped carbon, lithium-ion/sodium-ion batteries, wedge-shaped porous framework