Accurate determination of optimal sulfur content in mesoporous carbon hosts for high-capacity stable lithium-sulfur batteries

Freestanding carbon nanofoam papers with tunable porosity as lithium–sulfur battery cathodes

“…Prior studies with mesoporous carbons have shown that partial sulfur fillings lead to improved performance. [27][28][29] Upon identifying S@CNFP-40/500-6 h as a pore-solid architecture that balances sulfur utilization and electrode specific capacity, we cycled additional cells for 100 cycles demonstrating good capacity retention and high coulombic efficiency (>95%). The role of pore structure in transport and concentration polarization are further exacerbated at higher rates.…”

“…1,[19][20][21][22][23][24] Melt-infiltration is a common approach to load sulfur into these porous hosts, but such methods rely on capillary action and require time to produce uniform and conformal distributions of sulfur. 5,12,17,20,[25][26][27][28][29] These sulfur-carbon composites are often prepared in powder form and mixed with carbon black, binder, and solvent, then cast as a slurry onto a foil current collector. 5,9,12,17,19,20,[26][27][28][29][30][31] The resulting electrodes have suboptimal conductivity and mechanical strength, impeding rate capability and hindering the use of thicker electrodes to achieve high areal capacity.…”

“…5,12,17,20,[25][26][27][28][29] These sulfur-carbon composites are often prepared in powder form and mixed with carbon black, binder, and solvent, then cast as a slurry onto a foil current collector. 5,9,12,17,19,20,[26][27][28][29][30][31] The resulting electrodes have suboptimal conductivity and mechanical strength, impeding rate capability and hindering the use of thicker electrodes to achieve high areal capacity.…”

FeCoNi Ternary Nano-Alloys Embedded in a Nitrogen-Doped Porous Carbon Matrix with Enhanced Electrocatalysis for Stable Lithium–Sulfur Batteries

“…Although the carbonaceous materials with tailored pore structures, such as carbon nanotubes, − carbon nanospheres, − and porous carbons, − cannot merely supply a powerful conductive network but possess a high specific surface area (SSA) that can accommodate electrolyte, physically confine LiPS, and relieve the volume expansion of sulfur, the weak Van-Der-Waals force interaction between carbonaceous materials and LiPS is unable to restrain the shuttle of LiPS, hence deteriorating long-term cycling stability. Therefore, metal compounds with rich activity sites that can absorb LiPS chemically must be introduced.…”

Nano-sulfur confined in a 3D carbon nanotube/graphene network as a free-standing cathode for high-performance Li–S batteries

“…11,12 The reasonable design and construction carbon material with sulfur is an effective measure to solve the problems of lithium-sulfur batteries. Various sulfur/carbon composites, such as sulfur/graphene (S/G), 13,14 sulfur/carbon nanotubes (S/CNTs), 15,16 sulfur/microporous carbon, 17,18 sulfur/ mesoporous carbon, 19,20 and sulfur/carbon bers, 21,22 have been prepared, which exhibit a satisfactory effect on the improvement of the conductivity of sulfur and inhibit the "shuttle effect". Carbon materials with excellent electrical conductivity, a high specic area, and strong adsorption capability can offer a conductive framework that not only enhances the electric contact of sulfur but also effectively retards the dissolving of polysuldes in the electrolyte.…”