Numerous mcasuremcnts have been made of the pH, Eh, and the potential of a silver-silver sulfide electrode in sodium sulficlo and sodium polysulf?de solutions. By suitably ostimating the second dissociation constant of hydrogen sulfide and various activity coefficients, it has been possiblo to derive a consistent model for the distribution of the polysulfide and sulfide species, Sp2, S,-“, S,-2...

DOI: 10.1002/aenm.201602923 suffer from safety problems arising from lithium anode and fast capacity fading due to the insulating nature of sulfur, the dissolution-induced polysulfide shuttle reaction, and large volume changes.[4–6] To address these issues, carbonaceous material[7,8] and conducting polymers[9] have been used to trap the high-order polysulfides in the cathodes; protective layers...

The success of the rechargeable Li-S cell is limited in part by the dissolution of lithium-polysulfide in the electrolyte. Remarkably, it is found that removal of the conventional membrane separator in a Li-S cell improves sulfur utilization and cycling performance, whether the sulfur is initially contained in the cathode or electrolyte. An optimized cell design yields discharge capacities as h...

(PPN)2C 16S18 was obtained by the addition of PPN+C1_ to a methanolic extract of Na2C4Sv, de­ rived from the reaction of C6S80 2 and NaOMe. Centrosymmetric C 16Si84consists of thiophene units unsymmetrically fused to two 1,4-dithiin rings. Solutions of C 16S]84~ convert to C8S82~ with heating. When C4S* (x ~ 8) is reduced by Na/NH3 followed by extraction and crystallization, one ob­ tains the b...

The potential of cesium polysulfide-flux reactions for the synthesis of chalcogenogallates was investigated by using X-ray diffraction and Raman spectroscopy. An investigation of possible factors influencing the product formation revealed that only the polysulfide content x in the Cs2Sx melts has an influence on the crystalline reaction product. From sulfur-rich melts (x > 7), CsGaS3 is formed,...

We report the first preparation of a supramolecular polysulfide polymer using metal-ligand interactions. The was prepared by introducing 2,2’-bipyridine (bpy) at both ends linear sulfur and linking bpy with Cu2+. molecular weight higher than obtained via conventional polymerization. Disassembly re-assembly polymers were controlled de-metalation Cu2+ from complex between re-formation addition ch...