Large-scale synthesis of ordered mesoporous carbon fiber and its application as cathode material for lithium–sulfur batteries

Abstract

Guo, Z. (2015). Large-scale synthesis of ordered mesoporous carbon fiber and its application as cathode material for lithium-sulfur batteries. Carbon, 81 782-787.Large-scale synthesis of ordered mesoporous carbon fiber and its application as cathode material for lithium-sulfur batteries AbstractA novel type of one-dimensional ordered mesoporous carbon fiber has been prepared via the electrospinning technique by using resol as the carbon source and triblock copolymer Pluronic F127 as the template. Sulfur is then encapsulated in this ordered mesoporous carbon fibers by a simple thermal treatment. The interwoven fibrous nanostructure has favorably mechanical stability and can provide an effective conductive network for sulfur and polysulfides during cycling. The ordered mesopores can also restrain the diffusion of long-chain polysulfides. The resulting ordered mesoporous carbon fiber sulfur (OMCF-S) composite with 63% S exhibits high reversible capacity, good capacity retention and enhanced rate capacity when used as cathode in rechargeable lithium-sulfur batteries. The resulting OMCF-S electrode maintains a stable discharge capacity of 690 mAh/g at 0.3 C, even after 300 cycles. ABSTRACT:A novel type of one-dimensional ordered mesoporous carbon fiber has been prepared via the electrospinning technique by using resol as the carbon source and triblock copolymer Pluronic F127 as the template. Sulfur is then encapsulated in this ordered mesoporous carbon fibers by a simple thermal treatment. The interwoven fibrous nanostructure has favorably mechanical stability and can provide an effective conductive network for sulfur and polysulfides during cycling. The ordered mesopores can also restrain the diffusion of long-chain polysulfides. The resulting ordered mesoporous carbon fiber sulfur (OMCF-S) composite with 63% S exhibits high reversible capacity, good capacity retention and enhanced rate capacity when used as cathode in rechargeable lithium-sulfur batteries. The resulting OMCF-S electrode maintains a stable discharge capacity of 690 mAh/g at 0.3 C, even after 300 cycles.

Polyurethane-derived N-doped porous carbon with interconnected sheet-like structure as polysulfide reservoir for lithium–sulfur batteries

“…First, the interconnected sheet-like structure and macropores are beneficial for the permeability of the electrolyte and provide shortened channels for the mass transport of lithium ions [39,46]. Second, meso/micropores produced by the activation process are very important to confine sulfur and polysulfides and all macro/meso/micropores are effective to buffer the large volume change during lithiation and delithiation [35,47,48]. Third, N-doping has a great positive effect for good electrochemical performances of the NPC-S composite.…”

One-pot self-assembly of graphene/carbon nanotube/sulfur hybrid with three dimensionally interconnected structure for lithium–sulfur batteries

“…In recent years, extensive research had been conducted to address these issues by the optimization of the electrolytes [7,8], and the combination of sulfur with conductive polymers [9], metal oxides [10e12] or carbon matrix [13,14]. In particular, carbon materials are effective candidates to enhance the utilization of sulfur and restrict the diffusion of polysulfides during the discharge/ charge process because of their high specific surface area, porous structure and excellent conductivity.…”

Fabrication of ultrafine manganese oxide-decorated carbon nanofibers for high-performance electrochemical capacitors

“…When increasing the Mn dosage from 0.09 to 1.36 wt%, the surface area and pore volume decrease from 1507 m 2 g -1 and 1.129 cm 3 g -1 for 0.025MnOn-CNF to 1366 m 2 g -1 and 0.961 cm 3 g -1 for 0.500MnOn-CNF (Table S1). In spite of this, it is noteworthy to mention that our fabricated MnOn-CNF composites exhibit the extremely high surface area and porosity, nearly 10 times of those reported [9][10][11][12][13]. Moreover, all MnOn-CNF composites show a similar pore size around 4.0 nm (Fig.…”

“…To replace such ``low efficient'' preparations, pyrolysis of electrospun fibers within metal and carbon precursors proves to be effective to construct evenly dispersed metal oxides firmly attached onto the carbon nanofibers [9][10]. However, the resulting composites often possess an extremely low surface area and porosity, though some pore-forming reagents, including surfactants and silica assistants, are often involved [11][12][13], which largely limits the power capacity. Facile fabrication of high-performance ultrafine metal oxide-carbon nanofiber composites still remains challenging.…”