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

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.

10aelectrocatalysis10agraphene10alithium-sulfur battery10amechanical exfoliation10apolyvalent interaction1 aKumar, Subramani1 aKrishnamoorthy, Kothandam uhttps://library.ncl.res.in/content/concurrent-polyvalent-interaction-and-electrocatalysis-improve-lithium-sulfur-battery02395nas a2200289 4500008004100000245015800041210006900199260000800268490000700276520133300283653002501616653003201641653002701673653001701700653002401717100003801741700003401779700001601813700002201829700001801851700001901869700002001888700001801908700003001926700001901956856013001975 2025 eng d00aHeteroatom-synergistic effect on anchoring polysulfides in chalcone-linked nanographene covalent organic frameworks for high-performance Li―S batteries0 aHeteroatomsynergistic effect on anchoring polysulfides in chalco cAPR0 v123 a

Lithium-sulfur (Li & horbar;S) batteries are an attractive option for future energy storage devices because they offer higher theoretical specific capacity, energy density, and cost-effectiveness than commercial lithium-ion batteries. However, the practical applications of Li & horbar;S batteries are significantly limited by the shuttle effect caused by intermediate lithium polysulfides (LiPSs) and slow redox kinetics. In this study, the molecular engineering of chalcone-linked, sp(2)-bonded nanographene-type covalent organic frameworks (COFs) as sulfur hosts is reported to enhance interactions with LiPSs, thereby effectively suppressing the shuttle effect. The developed sulfur-hosting cathode material demonstrated outstanding battery performance, surpassing most reported materials by achieving a specific capacity of 1228 mA h g(-1) at 0.5C, with 80% retention after 500 cycles and an average Coulombic Efficiency (C.E.) of 99%. Additionally, the mechanisms of sulfur immobilization, the subsequent conversion into lithium polysulfides (LiPSs), and their binding energies with COFs are investigated using density functional theory (DFT) calculations. These findings offer valuable insights into the structure-property relationships essential for developing more efficient sulfur-hosting cathodes.

10aanion-pi interaction10acovalent organic frameworks10alithium-sulfur battery10ananographene10apolysulfide shuttle1 aRanjeesh, Kayaramkodath, Chandran1 aJavaregowda, Bharathkumar, H.1 aGaber, Safa1 aBhauriyal, Preeti1 aKumar, Sushil1 aSkorjanc, Tina1 aFinsgar, Matjaz1 aHeine, Thomas1 aKrishnamoorthy, Kothandam1 aShetty, Dinesh uhttps://library.ncl.res.in/content/heteroatom-synergistic-effect-anchoring-polysulfides-chalcone-linked-nanographene-covalent02361nas a2200289 4500008004100000022001400041245014100055210006900196260000800265300001100273490000800284520134700292653002501639653001401664653002601678653003001704653002701734653002001761653002601781100002201807700002201829700002001851700002101871700002201892700002801914856012901942 2025 eng d a1381-514800aMethoxyl-containing hyper-crosslinked polymer from largely bio-based biphenyl methyl ether and its application in lithium-sulfur battery0 aMethoxylcontaining hypercrosslinked polymer from largely biobase cFEB a1061390 v2073 a

A new biphenyl methyl ether viz 2,2 `,3,3 `-tetramethoxy-5,5 `-bis(methoxymethyl)-1,1 `-biphenyl (TBMB) was synthesized starting from vanillin via three-step reaction sequence. The self-polycondensation of TBMB by employing two Bronsted acid catalysts, viz, p- toluenesulfonic acid (PTSA) and trifluoromethanesulfonic acid (TFSA) led to the formation of organic hyper-crosslinked polymers (HCPs) containing built-in methoxyl groups. HCPs were characterized by FTIR, solid state 13 C NMR, XPS, XRD, TGA, BET, and FESEM analysis techniques. HCPs synthesized using PTSA (HCP-PTSA) and TFSA (HCP-TFSA) exhibited a Brunauer-Emmett-Teller (BET) surface area of 480 +/- 5 and 590 +/- 4 m2/g, respectively and consisted of hierarchical pore structures with both micropores and mesopores. HCP-TFSA was evaluated as an active coating layer on conventional polypropylene (PP) separator in lithium-sulfur batteries to suppress the polysulfide shuttling on account of the ability of methoxyl groups to anchor soluble polysulfide species via coordination. The significant polysulfide adsorption capacity and improved cycling stability with a capacity of 617.2 mAh g- 1 at 0.5C and 99% capacity retention highlighted the potential of porous HCP containing built-in methoxyl groups in the development of attractive lithium-sulfur battery systems.

10aActive coating layer10abio-based10aBiphenyl methyl ether10aHyper-crosslinked polymer10alithium-sulfur battery10aMethoxyl groups10aSelf-polycondensation1 aWale, Apparav, K.1 aDas, Anoushka, K.1 aPatil, Nita, R.1 aShelke, Manjusha1 aAmbade, Ashootosh1 aWadgaonkar, Prakash, P. uhttps://library.ncl.res.in/content/methoxyl-containing-hyper-crosslinked-polymer-largely-bio-based-biphenyl-methyl-ether-and