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ۼ : 15-06-15 10:35
[15.06]ڹ - Synthesis of Three-Dimensionally Interconnected Sulfur-Rich Polymers for Cathode Materials of High-Rate Lithium-Sulfur Batteries
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ȸ : 1,477  

Synthesis of Three-Dimensionally Interconnected Sulfur-Rich Polymers for Cathode Materials of High-Rate Lithium-Sulfur Batteries

Hoon Kim, Joungphil Lee, Hyungmin Ahn, Onnuri Kim, Moon Jeong Park*

Elemental sulfur is one of the most attractive cathode active materials in lithium batteries by taking advantage of high theoretical specific capacity. Despite the positive aspect, lithiumsulfur batteries have suffered from severe capacity fading and limited rate capability. Here we report a facile large-scale synthesis of new class of organosulfur compounds that could open a new chapter in designing cathode materials to advance lithiumsulfur battery technologies. Porous trithiocyanuric acid crystals were 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 lithiumsulfur cells showed discharge capacity of 945mAh/g 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 increased Li+-ion transfer rate, affording the best rate performance of 1210mAh/g at 0.1 C and 730mAh/g at 5 C.

 

Ȳ Ҵ 1673 mAh/g̶ ̷ 뷮 Ƭ ͸ ް ִ ع ϳ̴. ̷ ұ ϰ Ŭ ̳ ū 뷮Ҹ ̰ / ǿ δٴ ġ ؿԴ. ̿ , ٰ trithiocyanuric acid soft-template Ͽ ǥ鿡 ġ thiol group Ȳ ȯ չ ο -Ȳ ڸ ռϿ. Ư, Ȳ 3 ä -Ȳ ο ν Ƭ-Ȳ Ư ʷ ־. ȭ -Ȳ ع ϴ Ƭ-Ȳ 945 mAh/g 450Ŭ ̻ Ͽ. ó Ŀ´̼ǽ(Nature Communications) 6 12 ¶ Ǿ.


 
 

Total 77
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