ZIF-derived twisted wedge-shaped CoS2/NC nanoporous architectures pinned to graphene foam as negative electrode for lithium and sodium-ion batteries

Abstract

• A novel wedge-shaped CoS 2 /NC@NPG nanoporous structure is developed. • The waved wrinkles on porous carbon framework facilitate ion transmission. • ZIF-L and N -doped porous graphene construct 3D conductive network. • The composite exhibits remarkable rate performance for LIBs/SIBs. 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 negative electrode 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. This work would provide an efficient and concise approach for designing three-dimensional porous structure and self-supporting complex combining transition metal sulfides and carbon matrix for serving as advanced energy storage material.