title: Synthesis of three-dimensionally interconnected sulfur-rich polymers for cathode materials of high-rate lithium-sulfur batteries.
abstract: Elemental sulfur is one of the most attractive cathode active materials in lithium batteries because of its high theoretical specific capacity. Despite the positive aspect, lithium-sulfur batteries have suffered from severe capacity fading and limited rate capability. Here we report facile large-scale synthesis of a class of organosulfur compounds that could open a new chapter in designing cathode materials to advance lithium-sulfur battery technologies. Porous trithiocyanuric acid crystals are synthesized for use as a soft template, where the ring-opening polymerization of elemental sulfur takes place along the thiol surfaces to create three-dimensionally interconnected sulfur-rich phases. Our lithium-sulfur cells display discharge capacity of 945 mAh g(-1) after 100 cycles at 0.2 C with high-capacity retention of 92%, as well as lifetimes of 450 cycles. Particularly, the organized amine groups in the crystals increase Li(+)-ion transfer rate, affording a rate performance of 1210, mAh g(-1) at 0.1 C and 730 mAh g(-1) at 5 C.
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
authors.forename: Hoon
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
authors.forename: Joungphil
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
authors.forename: Hyungmin
authors.initials: H
authors.lastname: Ahn
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
authors.forename: Onnuri
authors.initials: O
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.|Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
authors.forename: Moon Jeong
authors.initials: MJ
authors.lastname: Park