A Porous Carbon Polyhedron/Carbon Nanotube Based Hybrid Material as Multifunctional Sulfur Host for High‐Performance Lithium‐Sulfur Batteries. Issue 13 (10th July 2019)

• Record Type: Journal Article
• Authors: Ren, Juan; Song, Zhicui; Zhou, Xuemei; Chai, Yuru; Lu, Xiaoli; Zheng, Qiaoji; Xu, Chenggang; Lin, Dunmin
• Is Part Of: ChemElectroChem. Volume 6:Issue 13(2019)
• Page Start: 3410
• Page End: 3419
• Publication Date: 2019-07-10
• Subjects: metal-organic frameworks -- carbon polyhedrons -- resorcinol-formaldehyde polymer -- carbon nanotubes -- lithium-sulfur batteries; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201900744
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: To develop high‐performance lithium‐sulfur (Li−S) batteries, designing and exploring an advanced sulfur cathode with a conductive and polar robust framework is highly significant to suppress the "shuttle effect" of polysulfides and enhance the utilization of active sulfur. Herein, a multifunctional conductive nanohybrid, which acts as a sulfur host, is rationally constructed by inserting/intertwining carbon nanotubes (CNTs) onto Co‐embedded N‐doped porous dual carbon polyhedrons derived from a resorcinol‐formaldehyde (RF) polymer layer enwrapping ZIF‐67 metal‐organic frameworks (MOFs) (Co, N−C@RFC/CNTs). The porous carbon polyhedrons can accommodate a high amount of sulfur owing to their large inner void space; the RF coating carbon layer and the CNTs effectively increase the conductivity and build a network for providing smooth ions/e − pathways; In addition, the polar Co particles and electronegative N heteroatoms synergistically strengthen the chemical adsorption of polysulfides and accelerate the redox reaction of the sulfur cathode. Benefiting from these advantages, the as‐fabricated Co, N−C@RFC/CNTs/S cathode delivers a high reversible capacity of 1373.7 mAh g −1 at 0.1 C, an impressive rate performance with 659.2 mAh g −1 at 2.0 C, and an outstanding cycling stability with an ultralow capacity decay rate of 0.041 % per cycle for 500 cycles at 1.0 C. This work provides a facile and high‐efficiency approach to fabricating excellent‐performance storage materials based on an MOF precursor. Abstract : A multifunctional conductive nanohybrid that serves as a sulfur host in Li−S batteries is rationally constructed by inserting/intertwining carbon nanotubes onto Co‐embedded N‐doped porous dual carbon polyhedrons derived from a resorcinol‐formaldehyde (RF) polymer layer enwrapping ZIF‐67 metal‐organic frameworks (Co, N−C@RFC/CNTs). The as‐fabricated Co, N−C@RFC/CNTs/S cathode delivers a high reversible capacity of 1373.7 mAh g −1 at 0.1 C and an outstanding cycling stability with an ultralow capacity decay rate of 0.041 % per cycle for 500 cycles at 1.0 C.