Seo, Seung-Deok Choi, Changhoon Park, Dongjoo Lee, Dong-Yeop Park, Sangbaek Kim, Dong-Wan 2024-01-19T16:03:39Z 2024-01-19T16:03:39Z 2021-09-02 2020-11-15 1385-8947 https://pubs.kist.re.kr/handle/201004/117845 Two-dimensional (2D) nanosheets are promising interlayers for enhancing the electrical conductivity and hindering the lithium polysulfide (LPS) shuttling in lithium-sulfur batteries (LSB). However, their dense 2D nature limits the electrolyte infusion and lithium ion transport, thereby decreasing the rate performance. Herein, we demonstrate that three-dimensional (3D) crumpled carbon nanosheets (CCNSs) decorated with a few nanometers of cobalt heterostructures (CoxSy) that are based on a 2D zeolitic imidazolate framework can improve both the LPS adsorption as well as the ion conduction of LSB interlayer. The method is simple and scalable; the 3D composites are fabricated by post-annealing of 2D metal organic frameworks, which are synthesized by a solution process at room temperature without surfactant. Interestingly, the assembly and polarity of cobalt heterostructures can be further manipulated by the annealing condition; this provides a scientific evidence for the nanostructural and compositional combination of polar compounds. Consequently, CoS/Co9S8@CCNS exhibits the best performance with a discharge capacity of 911 mA h g(-1) at 0.2C after 100 cycles (150% more than commercial sulfur cell) and the long-term cyclability of 600 mA h g(-1) at 1C after 500 cycles. This is attributed to efficient charge transfer as well as effective LPS adsorption and effective catalytic conversion; further, this is achieved by the synergetic effects of well-distributed polar compounds comprising few nanometers in size and optimal polarity on a highly conductive N-doped carbon nanosheet. English ELSEVIER SCIENCE SA TRAPPING-DIFFUSION-CONVERSION RATIONAL DESIGN GRAPHENE OXIDE PERFORMANCE POLYSULFIDES SEPARATOR CATHODE ZIF-67 HETEROSTRUCTURES NANOPARTICLES Metal-organic-framework-derived 3D crumpled carbon nanosheets with self-assembled CoxSy nanocatalysts as an interlayer for lithium-sulfur batteries Article 10.1016/j.cej.2020.125959 1 CHEMICAL ENGINEERING JOURNAL, v.400 CHEMICAL ENGINEERING JOURNAL 400 scie scopus 000569900100008 2-s2.0-85086729667 Engineering, Environmental Engineering, Chemical Engineering Article TRAPPING-DIFFUSION-CONVERSION RATIONAL DESIGN GRAPHENE OXIDE PERFORMANCE POLYSULFIDES SEPARATOR CATHODE ZIF-67 HETEROSTRUCTURES NANOPARTICLES 2D-ZIF nanosheets Cobalt sulfide catalyst Lithium polysulfide adsorption Lithium-sulfur batteries Carbon nanosheets