Synthesis of three-dimensionally interconnected sulfur-rich polymers for cathode materials of high-rate lithium-sulfur batteries
SCIE
SCOPUS
- Title
- Synthesis of three-dimensionally interconnected sulfur-rich polymers for cathode materials of high-rate lithium-sulfur batteries
- Authors
- Kim, H; Lee, J; Ahn, H; Kim, O; Park, MJ
- Date Issued
- 2015-06
- Publisher
- Nature Publishing Group
- 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 945mAhg(-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 mAhg (-1) at 0.1 C and 730mAhg(-1) at 5 C.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/35572
- DOI
- 10.1038/NCOMMS8278
- ISSN
- 2041-1723
- Article Type
- Article
- Citation
- Nature Communications, vol. 6, 2015-06
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