Well-dispersed sulfur anchored on interconnected polypyrrole nanofiber network as high performance cathode for lithium-sulfur batteries

Abstract

a b s t r a c tPreparation of novel sulfur/polypyrrole (S/PPy) composite consisting well-dispersed sulfur particles anchored on interconnected PPy nanowire network was demonstrated. In such hybrid structure, the asprepared PPy clearly displays a three-dimensionally cross-linked and hierarchical porous structure, which was utilized in the composite cathode as a conductive network trapping soluble polysulfide intermediates and enhancing the overall electrochemical performance of the system. Benefiting from this unique structure, the S/PPy composite demonstrated excellent cycling stability, resulting in a discharge capacity of 931 mAh g À1 at the second cycle and retained about 54% of this value over 100 cycles at 0.1 C. Furthermore, the S/PPy composite cathode exhibits a good rate capability with a discharge capacity of 584 mAh g À1 at 1 C.

Flexible S/DPAN/KB Nanofiber Composite as Binder-Free Cathodes for Li-S Batteries

“…On the other hand, PAN shows a typical type II isotherm which is generally observed in nonporous materials. 36 The BET surface area of PAN obtained by N 2 adsorption analysis is low, 1.26 m 2 g −1 . In the case of S/PAN/KB and S/DPAN/KB, the surface areas are around 21.39 m 2 g −1 and 94.73 m 2 g −1 , the BJH mean pore diameters are 3.711 nm and 3.717 nm, respectively.…”

Microwave absorption properties of double‐layer nanocomposites based on polypyrrole/natural rubber

“…The CH 3 asymmetric stretching in FTIR of both samples is observed at 1260 and 2961 cm −1 . In S 3 sample, the characteristic peak at around 1540 cm −1 can be related to the pyrrole ring fundamental vibrations due to the incorporation of PP and NR …”

Enhanced cycle performance of Li/S battery with the reduced graphene oxide/activated carbon functional interlayer

“…The S/PPy composites were prepared in accordance with our previous reports [29,30] . For sulfur electrodes, the S/PPy composite, super-P and polyvinylidene fluoride (PVDF) at a mass ratio of 8:1:1 were dissolved in N-methyl-2-pyrrolidone (NMP) to form a slurry.…”