High-Performance Lithium-Sulfur Batteries With an IPA/AC Modified Separator

Abstract

To inhibit the polysulfide-diffusion in lithium sulfur (Li-S) batteries and improve the electrochemical properties, the commercial polypropylene (PP) was decorated by an active carbon (AC) coating with lots of electronegative oxygenic functional group of –OH. Owing to the strong adsorption of AC and the electrostatic repulsion between the –OH and negatively charged polysulfide ions, the Li-S batteries demonstrated a high initial discharge capacity of 1,656 mAh g−1 (approximately 99% utilization of sulfur) and the capacity can still remain at 830 mAh g−1 after 100 cycles at 0.2 C. Moreover, when the rate was increased to 1 C, the batteries could also possess a discharge capacity of 1,143 mAh g−1. The encouraging cycling stability make clear that this facile approach can successfully restrain the shuttle effect of polysulfides and make further progress to the practical application of Li-S batteries.

Mechanistic understanding of the role separators playing in advanced lithium‐sulfur batteries

“…To maximize the inhibition effect of the separator on polysulfide migration, several materials have been developed with the combination of ion‐trap, charge‐shield, and ion‐sieve effects . Huang et al prepared a GO‐coated Celgard separator.…”

Geometrical engineering of a SPAN–graphene composite cathode for practical Li–S batteries

“…First, sulfur is poorly conductive (5 Â 10 À30 S cm À1 ), limiting the rate capability of Li-S batteries. 7,12 Second, redox reactions resulting from the shuttling of lithium poly-suldes (LiPs) lead to active-material loss; [13][14][15] and third, the huge volume expansion of the active material upon the formation of Li 2 S compromises battery stability. 16,17 However, researchers have attempted to resolve these challenges using strategies such as the embedment of sulfur in mesoporous carbon, 18,19 the encapsulation of sulfur cores in porous carbon shells, 20 engineering the nano/microstructure of the cathode substrate, [21][22][23] and wrapping of elemental sulfur with graphene.…”

A Typha Angustifolia-Like MoS2/Carbon Nanofiber Composite for High Performance Li-S Batteries

“…In view of such a serious situation, tremendous efforts have been made to suppress polysulfide shuttling with physical confinement and chemical absorption by constructing various kinds of nanostructures, such as the non-polar porous carbon (Rehman et al, 2016;Guo et al, 2018), graphene (Yin et al, 2016), carbon nanotubes (Yang et al, 2018), as well as the polar metal oxides (Gu et al, 2016;Song et al, 2018), metal sulfides (He et al, 2019;Lin et al, 2019), metal carbide (Chen et al, 2018;Dong et al, 2018;Song et al, 2019), metal nitride (Jiao et al, 2019;Wang et al, 2019), etc. Accordingly, LiPSs shuttling has alleviated to some extent.…”