Strongly Anchoring Polysulfides by Hierarchical Fe3O4/C3N4 Nanostructures for Advanced Lithium–Sulfur Batteries

Abstract

Li–S batteries have attracted considerable interest as next-generation energy storage devices owing to high energy density and the natural abundance of sulfur. However, the practical applications of Li–S batteries are hampered by the shuttle effect of soluble lithium polysulfides (LPS), which results in low cycle stability. Herein, a functional interlayer has been developed to efficiently regulate the LPS and enhance the sulfur utilization using hierarchical nanostructure of C3N4 (t-C3N4) embedded with Fe3O4 nanospheres. t-C3N4 exhibits high surface area and strong anchoring of LPS, and the Fe3O4/t-C3N4 accelerates the anchoring of LPS and improves the electronic pathways. The combination of these materials leads to remarkable battery performance with 400% improvement in a specific capacity and a low capacity decay per cycle of 0.02% at 2 C over 1000 cycles, and stable cycling at 6.4 mg cm−2 for high-sulfur-loading cathode.

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

“…Carbon materials, conducting polymers and transition metal oxides (TMOs) are the most widely used electrode materials in SCs [10][11][12]. Particularly, TMOs, such as CoO [13,14], Co 3 O 4 [15], NiO [16] and Fe 3 O 4 [17], deliver much higher specific capacitance than that of carbon materials and conductive polymers benefiting from the multiple reversible faradaic redox reactions.…”

Fast‐Charging Lithium–Sulfur Batteries Enabled via Lean Binder Content

“…The Li + diffusion coefficient can be estimated using the Randles–Sevcik equation (detailed in Figure S7, Supporting Information). [ 30–32 ] In the case of Li–S cell with X1C3, the slopes of oxidation peaks current ( O 1) versus v 1/2 plot increased by 149% and 180% compared with that for the chitosan and XNBR, respectively. The slopes of reduction peak current versus v 1/2 plots increased by 157%( R 1) and 182%( R 2) compared with that for the chitosan, and 469%( R 1) and 368%( R 2) compared with that for the XNBR.…”

The Synergy of La2O3 Nanoparticles and Graphene for Advanced Li‐S Batteries

“…Polar metal‐based oxides (PMOs) are a much‐used catalyst in Li−S batteries that often supported onto conductive carbon to propose effective charge transfer and mitigate the leakage of polysulfide [17,18,19,20,21,22] . However, the poor conductivity of PMOs slows down the redox reaction kinetics of the battery.…”

“…Polar metal-based oxides (PMOs) are a much-used catalyst in LiÀ S batteries that often supported onto conductive carbon to propose effective charge transfer and mitigate the leakage of polysulfide. [17,18,19,20,21,22] However, the poor conductivity of PMOs slows down the redox reaction kinetics of the battery. The application of rare earth elements with special electronic structures and catalytic properties to energy storage systems is a promising solution to this problem, such as La 2 O 3 , CeO 2 .…”