01960nas a2200193   4500008004100000245010500041210006900146260000800215490000600223520124600229653002101475653001301496653002701509653002701536653002701563100002101590700003001611856012501641       2022                        eng d00aConcurrent polyvalent interaction and electrocatalysis to improve lithium-sulfur battery performance0 aConcurrent polyvalent interaction and electrocatalysis to improv  cFEB0 v53 a<p>
	Batteries with improved efficiency are desired. Li-S batteries are attractive due to their high specific capacity and energy density. However, sluggish sulfur redox reaction and polysulfide dissolution are significant challenges in Li-S batteries. In this work, we report graphene with doped layer to electrocatalyze the sluggish sulfur redox reaction. The doped layer comprises heteroatoms such as either N or N and S. The doped layer also comprises cations of Ni. We have chosen a ``doped layer on graphene'' over ``doped graphene'' to avoid defects in the basal plane of graphene. We found the doped layer comprising graphene (DLC-G) to electrocatalyze the polysulfide redox reaction. However, the interaction between the doped layer and polysulfide is still weak, hence the dissolution is not suppressed. To circumvent the polysulfide dissolution, graphene with cationic layer was prepared. We found that cations in the layer electrostatically attract the polysulfides due to the polyvalent interaction. Thus, the dissolution is suppressed. While using this material in the Li-S batteries, the specific capacity, energy density and power density were found to be 1345 mAh g(-1), 782 Wh kg(-1) and 4437 W kg(-1), respectively.</p>
10aelectrocatalysis10agraphene10alithium-sulfur battery10amechanical exfoliation10apolyvalent interaction1 aKumar, Subramani1 aKrishnamoorthy, Kothandam  uhttps://library.ncl.res.in/content/concurrent-polyvalent-interaction-and-electrocatalysis-improve-lithium-sulfur-battery