Cobalt and Nitrogen Co-Doped Nano-Porous Carbon: Synthesis and Application for Lithium-Sulfur Battery

Abstract

S@C-Co-N nanoporous carbon co-doped with cobalt and nitrogen as the cathode of lithium-sulfur battery are prepared. The synthetic route is carried out via the carbonization of metal organic frameworks polyhedron ZIF-67, followed by the heat treatment with sulfur. The SEM images suggest that C-Co-N composite maintains almost the same size and polyhedron shape of ZIF-67. The XRD pattern confirms the existence of cobalt element. As cathode for lithium-sulfur battery, the S@C-Co-N composite delivers a reversible capacity of 916.6 mAh•g −1 at the initial cycle and 460.5 mAh•g −1 after 500 cycles at 0.5 C, with a capacity fading of 0.09% per cycle.

Recent Progress on Zeolitic Imidazolate Frameworks and Their Derivatives in Alkali Metal–Chalcogen Batteries

“…ZIF‐67, which is composed of Co atoms and organic linkers, is a suitable precursor for producing carbon frameworks embedded with Co nanoparticles. [ 41,106–110 ] For instance, Dong et al. prepared a ZIF‐67‐derived sulfur host containing Co‐ and N‐doped graphitic carbon (Co‐N‐C).…”

“…ZIF-67, which is composed of Co atoms and organic linkers, is a suitable precursor for producing carbon frameworks embedded with Co nanoparticles. [41,[106][107][108][109][110] For instance, Dong et al prepared a ZIF-67-derived sulfur host containing Co-and N-doped graphitic carbon (Co-N-C). [106] Benefiting from the unique catalytic capability of Co-N-C species, the as-prepared Li-S batteries with a sulfur content of 70 wt% had excellent rate capability (565 mAh g −1 at 5.0 C) and stable cyclic performance for 500 cycles at 1.0 C. Similarly, Yuan et al fabricated a sulfur host based on Co nanoparticles and graphitic carbon nanocages through annealing ZIF-67 under an Ar/H 2 atmosphere.…”