title: Synergistically Enhanced Polysulfide Chemisorption Using a Flexible Hybrid Separator with N and S Dual-Doped Mesoporous Carbon Coating for Advanced Lithium-Sulfur Batteries.
abstract: Because of the outstanding high theoretical specific energy density of 2600 Wh kg(-1), the lithium-sulfur (Li-S) battery is regarded as a promising candidate for post lithium-ion battery systems eligible to meet the forthcoming market requirements. However, its commercialization on large scale is thwarted by fast capacity fading caused by the Achilles' heel of Li-S systems: the polysulfide shuttle. Here, we merge the physical features of carbon-coated separators and the unique chemical properties of N and S codoped mesoporous carbon to create a functional hybrid separator with superior polysulfide affinity and electrochemical benefits. DFT calculations revealed that carbon materials with N and S codoping possess a strong binding energy to high-order polysulfide species, which is essential to keep the active material in the cathode side. As a result of the synergistic effect of N, S dual-doping, an advanced Li-S cell with high specific capacity and ultralow capacity degradation of 0.041% per cycle is achieved. Pushing our simple-designed and scalable cathode to a highly increased sulfur loading of 5.4 mg cm(-2), the Li-S cell with the functional hybrid separator can deliver a remarkable areal capacity of 5.9 mAh cm(-2), which is highly favorable for practical applications.
authors.affiliation: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V. , D-01171 Dresden, Germany.
authors.forename: Juan
authors.initials: J
authors.lastname: Balach
authors.affiliation: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V. , D-01171 Dresden, Germany.
authors.forename: Harish K
authors.initials: HK
authors.lastname: Singh
authors.affiliation: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V. , D-01171 Dresden, Germany.
authors.forename: Selina
authors.initials: S
authors.lastname: Gomoll
authors.affiliation: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V. , D-01171 Dresden, Germany.
authors.forename: Tony
authors.initials: T
authors.lastname: Jaumann
authors.affiliation: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V. , D-01171 Dresden, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Klose
authors.affiliation: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V. , D-01171 Dresden, Germany.
authors.forename: Steffen
authors.initials: S
authors.lastname: Oswald
authors.affiliation: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V. , D-01171 Dresden, Germany.
authors.forename: Manuel
authors.initials: M
authors.lastname: Richter
authors.affiliation: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V. , D-01171 Dresden, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Eckert
authors.affiliation: Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V. , D-01171 Dresden, Germany.
authors.forename: Lars
authors.initials: L
authors.lastname: Giebeler
keywords: DFT calculation; hybrid separator; lithium−sulfur battery; mesoporous carbon coating; nitrogen/sulfur codoped; polysulfide adsorption