Intertwined Nitrogen‐Doped Carbon Nanotube Microsphere as Polysulfide Grappler for High‐Performance Lithium‐Sulfur Batteries

Abstract

A kind of yarn-like nitrogen-doped carbon nanotubes microsphere (NSCNT) is synthesized in one-step synthesis, and sulfur is added by melting immersion to form carbon nanotube microspheres/sulfur composites (NSCNT/S). The morphology, structure and electrochemical property of the obtained NSCNT/ S are explored by field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and electrochemical tests. The results show that NSCNT possesses a high N content and unique mesoporous carbon framework with large specific surface area of 1029 m 2 g À 1 , which can not only favor rapid electron and Li-ion transfer but also effectively mitigate dissolved polysulfides via strong chemical and physical adsorption. Due to the synergetic interaction of NSCNT, the NSCNT/S delivers a high initial discharge capacity of 1241.3 mAh g À 1 at 0.1 C and large rate capacity of 1175.5 mAh g À 1 at 1 C with ultralow capacity decay of 0.1 % per cycle and high areal mass loading of 3.1 mg cm À 2 . This eco-friendly NSCNT/S can offer an appealing improvement for the applications of high-performance lithium-sulfur batteries.

Customized Structure Design and Functional Mechanism Analysis of Carbon Spheres for Advanced Lithium–Sulfur Batteries

“…Additionally, the doped N atom in carbon lattice can increase the intrinsic electrical conductivity of CSs and change the electronic distribution, introducing more defects and active centers for the chemisorption of LiPSs. [327] And doping N in the carbon lattice can increase the conductivity of CS S , change the electron distribution, and create more active sites for the adsorption of LiPSs. The effect was more obvious after densely stacking N-doped hollow submicron CSs into the N-doped carbon comb.…”

A Review on Applications of Layered Phosphorus in Energy Storage

“…Carbon-based materials typified by conductive carbon black, carbon nanotubes, and graphene have obvious advantages in electronic conductivity. A carbon-based matrix may not only improve the electrical conductivity of the carbon/sulfur cathode, but can also reduce the loss of the intermediate products-soluble polysulfides by physical adsorption [108][109][110]. Metal oxide and metal sulfide having a strong chemical adsorption polysulfide can effectively reduce the loss of active substance, which can improve the cycle performance of LSBs [111][112][113].…”

Anion‐Doped Cobalt Selenide with Porous Architecture for High‐Rate and Flexible Lithium–Sulfur Batteries

“…More recently, heteroatom doping into carbon, like N‐graphene, N,P‐codoped carbon framework, has been proved to be a successful strategy to improve the interaction carbon with LiPSs. [ 28–31 ]…”