Yoon, Hyunseok Park, Dongjoo Song, Hee Jo Park, Sangbaek Kim, Dong-Wan 2024-01-19T14:31:50Z 2024-01-19T14:31:50Z 2022-01-25 2021-06 2168-0485 https://pubs.kist.re.kr/handle/201004/116880 Lithium-sulfur batteries (LSBs) are considered as a potential candidate for replacing lithium-ion batteries (LIBs), owing to their high theoretical energy density and low cost. However, the practical development of LSBs is considerably impeded, owing to the shuttling effect caused by soluble lithium polysulfide. Herein, we report porous cobalt disulfide (CoS2) nanosheets vertically grown on activated cellulose-derived carbon nanofibers (CoS2/ACCF) as an excellent interlayer for LSBs. The vertically arranged two-dimensional (2D) CoS2 nanosheets maximized the reactive surface area exposed to the electrolyte. In addition, each CoS2 nanosheet has a unique porous and crystalline structure comprising numerous nanograins encapsulated by carbon, which induces excellent electrical conductivity and stability. Benefiting from its novel architecture, CoS2/ACCF provides superior high-rate performance (815 mA h g(-1) at 2C) in LSBs. Furthermore, electrochemical impedance spectroscopy studies proved that CoS2/ACCF accelerated the interfacial reaction kinetics through highly exposed active sites on vertical 2D nanosheets, resulting reversible and stable long-term cycling performance (982 mA h g(-1) after 100 cycles at 0.1C and 580 mA h g(-1) after 500 cycles at 1C). Therefore, this work suggests a new strategy to design an effective interlayer through a facile and cost-effective method for the commercialization of LSBs. English American Chemical Society Vertically Aligned Sulfiphilic Cobalt Disulfide Nanosheets Supported on a Free-Standing Carbon Nanofiber Interlayer for High-Performance Lithium-Sulfur Batteries Article 10.1021/acssuschemeng.1c01494 1 ACS Sustainable Chemistry & Engineering, v.9, no.25, pp.8487 - 8496 ACS Sustainable Chemistry & Engineering 9 25 8487 8496 N scie scopus 000669547700016 2-s2.0-85110139948 Chemistry, Multidisciplinary Green & Sustainable Science & Technology Engineering, Chemical Chemistry Science & Technology - Other Topics Engineering Article EFFICIENT HYDROGEN POLYSULFIDES ELECTROCATALYSTS HETEROSTRUCTURES NANOPARTICLES CONVERSION HYDROXIDE ARRAYS cobalt disulfide vertical nanosheet carbon nano fiber interlayer lithium-sulfur battery