Nanopolyhedron Co–C/Cores triggered carbon nanotube in-situ growth inside carbon aerogel shells for fast and long-lasting lithium–sulfur batteries

Boosting Polysulfide Transformation by NiCo2S4 Hollow Dodecahedra@Nitrogen-Doped Carbon Core/Shell Nanostructures as Cathodes for Lithium–Sulfur Batteries

“…Recently, nanostructure engineering technologies have given rise to numerous methods for synthesizing materials with unique nanostructures. Metal–organic frameworks (MOFs) have a substantial specific surface area, high porosity, and customizable composition, acting as the precursor to synthesize TMCs with unique structures and pores. − Zeolite imidazolium frameworks (ZIFs), a branch of MOFs, have gained much attention owing to their simple synthesis, low cost, and specific dodecahedron structure. − By ion exchange and hydrothermal reaction, ZIFs can transform into TMCs with high surface area, hierarchical porosity, and unique nanostructure . Among TMCs, transition metal sulfides possess excellent theoretical specific capacity, structural stability, and excellent electrical conductivity, which have been explored as potential LSBs electrode materials .…”

In Situ Transformation of LDH into NiCo2S4-NiS2 Nano-heterostructures on Hollow Carbon Boxes to Promote Sulfur Electrochemistry for High-Performance Lithium–Sulfur Batteries

“…In this work, the NiCo 2 S 4 -CoS 2 nano-heterostructures (NiCo 2 S 4 -CoS 2 NH) and NiCo 2 S 4 -NiS 2 nano-heterostructures (NiCo 2 S 4 -NiS 2 NH) on hollow carbon boxes have been synthesized via ion exchange and on-site transformation of the morphologically controllable ZIF-67 precursor, to demonstrate the aforementioned strategy. Reasonable density design of porous materials can ensure the accommodation capability of sulfur species and higher energy density under high sulfur loading. − The “sealed” hollow carbon box can act as a sulfur container to astrict sulfur species and accommodate the volume variation during the electrochemical process, while the NiCo 2 S 4 -CoS 2 and NiCo 2 S 4 -NiS 2 nano-heterostructure on hollow carbon boxes can efficiently either provide effective adsorption of the soluble LiPS or act as catalytic sites at the electrode and electrolyte interface, which then can promote the quick transformation of LiPS even under harsh electrolyte conditions with the help of electronic feeding from the carbon matrix. The obtained sulfur cathode (S/NiCo 2 S 4 -NiS 2 NH@C) delivers a high capacity of 1207 mAh g –1 at 0.2C, outstanding rate performances (880 and 756 mAh g –1 at 1 and 2C), a long-term cyclability with a capacity retention of 60.23% at 1C after 450 cycles, and a high initial areal capacity of 6.09 mAh cm –2 (0.1C), with a high sulfur loading of 5.0 mg cm –2 under an E/S ratio of 8.0 mL g –1 .…”

Conversion of LiPSs Accelerated by Pt‐Doped Biomass‐Derived Hyphae Carbon Nanobelts as Self‐Supporting Hosts for Long‐Lifespan Li–S Batteries

“…[13] Hence, it remains challenging to achieve fast reaction kinetics of LiPSs with high S-loading cathodes for the practical applications of LSBs.Recently, integrating compounds, which combine the advantages from each component and introduce synergistic effects, have been widely adopted to achieve multiple functionalities required for sulfur hosts. [14,15] Song et al [16] synthesized a hybrid VO 2 -VN heterodimensional structure with a high S loading of 13 mg cm À2 , and the cell maintained a capacity of ~400 mAh g À1 over 20 cycles at 0.05 C, which was ascribed to the boosted reaction kinetics of LiPSs and improved electronic/ionic conductivity in the hybrid composite.Similar to the concept of integrating compounds, biological selfassembly nanotechnology can fabricate advanced multifunctional materials by a bottom-up method [17] and enable multidimensional building blocks with hierarchical ordering across various scales, providing multiple functionalities within one material. Rhizopus, a representative of the self-assembled biomaterials, has unique structures and functionalities.…”

“…Recently, integrating compounds, which combine the advantages from each component and introduce synergistic effects, have been widely adopted to achieve multiple functionalities required for sulfur hosts. [14,15] Song et al [16] synthesized a hybrid VO 2 -VN heterodimensional structure with a high S loading of 13 mg cm À2 , and the cell maintained a capacity of ~400 mAh g À1 over 20 cycles at 0.05 C, which was ascribed to the boosted reaction kinetics of LiPSs and improved electronic/ionic conductivity in the hybrid composite.…”