CS–CNTs homojunctions prepared by in situ growth of carbon nanotubes on the surface of porous carbon spheres for lithium–sulfur batteries

Abstract

Lithium-sulfur battery is expected to become a new generation of commercial battery owing to its ultra-high theoretical specific capacity, low-cost, and environmental benign. However, the inherent insulation of sulfur and the shuttle effect of lithium polysulfide between electrodes limit the application of lithium-sulfur battery. In order to solve these problems, we focus on the design of carbon-sulfur composite structure. Herein, CS-CNTs homojunctions featured with the carbon nanotubes (CNTs) in situ grown on carbon sphere (CS) is designed and synthesized by simple polymerization and heat treatment. The composites of CS with interconnected pore networks and CNTs with high conductivity not only offer a conductive framework to promote fast electron transmission, but also provide a larger space to load sulfur and effectively capture polysulfides. The CS-CNTs@S cathode shows better electrochemical performance compared with CS-CPs@S and CS@S. The first discharge specific capacity is 1053 mAh g −1 at 0.1 C. After 200 cycles, the specific capacity still remains at 427 mAh g −1 .

3D interconnected N-doped graphene architecture encapsulated with oxygen-deficient TiO2 nanotube array: synergism of oxygen vacancy and carbon materials on enhanced sulfur conversion and catalytic activity of TiO2 nanotube array in Li–S batteries

“…A possible solution to alleviate this issue is to merge sulfur, an insulating material, with a carbon-based substance that has excellent conductivity. This carbon-based substance can include graphene, 29,30 carbon nanotubes, [31][32][33][34][35] and mesoporous or microporous carbons. 36,37 This effective technique involves the encapsulation of sulfur within porous carbon.…”

A lamellar V2O3@C composite for aluminium-ion batteries displaying long cycle life and low-temperature tolerance

“…Below 200 1C, the weight loss (7.7%) is ascribed to the removal of adsorbed water. The loss between 200 1C and 400 1C is attributed to the carbon combustion,17,18 indicating a carbon content of 12.54%. When the temperature is higher than 400 1C, the mass increase is caused by the oxidation of V 2 O 3 to V 2 O 5 (Fig.S2c, ESI †) 19.…”