Novel sustainable nitrogen, iodine-dual-doped hierarchical porous activated carbon as a superior host material for high performance lithium-sulfur batteries. (25th October 2018)

• Record Type: Journal Article
• Authors: Ren, Juan; Zhou, Yibei; Guo, Meichen; Zheng, Qiaoji; Lin, Dunmin
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 43(2018)
• Page Start: 20022
• Page End: 20032
• Publication Date: 2018-10-25
• Subjects: Activated porous carbon -- N, I-dual doping -- Chemical adsorption -- Lithium-sulfur batteries; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.09.045
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Lithium-sulfur (Li-S) batteries exhibit great potential for next-generation high energy density energy storage. However, the insulativity of sulfur and the "shuttle effect" of polysulfides result in low utilization efficiency of active sulfur, fast capacity decay and inferior cycling stability, which pose the key challenge to their practical applications. Herein, a N, I-dual-doped hierarchical porous activated carbon (NIWFC) is successfully prepared for advanced Li-S batteries by the simple one-pot pyrolysis and hydrothermal processes. The obtained NIWFC owns interconnected porous framework with desirable specific surface area (2088.56 m 2 g −1 ) and large volume space (1.106 cm 3 g −1 ), which can accommodate high content of active sulfur and immobilize polysulfides through physical confinement. Moreover, the existence of N and I heteroatoms could effectively strengthen the chemical adsorption to polysulfides and create more active sites to enhance sulfur utilization. Attributed to these merits, impregnating sulfur into NIWFC (NIWFC/S) as cathode of Li-S batteries achieves a high initial discharge capacity of 1284.1 mAh g −1 at 0.1 C (remaining at 916.7 mAh g −1 after 100 cycles) and the outstanding cycling stability with a low capacity fading rate of 0.061% per cycle over 350 cycles at 1.0 C. This work provides a facile and cost-effective strategy to design a novel sustainable N, I-dual-doped porous carbon for high performance Li-S batteries and various energy storage fields. Graphical abstract: A novel sustainable N, I-dual-doped hierarchical porous activated carbon (NIWFC) is rationally designed and successfully fabricated by the facile pyrolysis and hydrothermal processes for the advanced lithium-sulfur (Li-S) batteries. Highlights: A novel N, I-dual-doped porous carbon is designed and successfully fabricated. The porous NIWFC material displays the strong adsorbability for polysulfides. The as-prepared NIWFC/S cathode exhibits remarkable electrochemical performance.