SiO₂-coated sulfur particles with mildly reduced graphene oxide as a cathode material for lithium–sulfur batteries

Abstract

For the first time, SiO2-coated sulfur particles (SCSPs) were fabricated via a facile two-step wet chemical process for application as a novel lithium-sulfur cathode material. With the addition of mildly reduced graphene oxide (mrGO), SCSPs demonstrate even greater cycling stability, maintaining over 700 mA h g(-1) after the 50(th) cycle.

High‐Energy, High‐Rate, Lithium–Sulfur Batteries: Synergetic Effect of Hollow TiO2‐Webbed Carbon Nanotubes and a Dual Functional Carbon‐Paper Interlayer

“…Particularly, the Li-S batteries are becoming attractive due to the abundance of elemental sulfur and its environmental compatibility. [ 25,26 ] Another approach is the use of metal oxides, such as TiO 2 , [27][28][29][30][31][32] SiO 2 , [ 33 ] Mg 0.6 Ni 0.4 O, [ 34 ] Al 2 O 3 , [ 35,36 ] Mg 0.8 Cu 0.2 O, [ 37 ] and ZrO 2 [ 38 ] as traps for the polysulfi des via physisorption and/or chemisorption. [ 9,10 ] Despite these advantages, several issues have hampered the practical use of Li-S batteries.…”

High-capacity graphene/sulfur/polyaniline ternary composite cathodes with stable cycling performance

“…In general, the capacity gradually fades with cycling because of the dissolution of polysulfide anions (S x 2− ). [3,4,[22][23][24] However, the cycling performances of graphene/S composite and graphene/S/PANI composite gradually increased in the first 30 cycles and showed superior stability in subsequent 120 cycles, which can demonstrate the successful prevention of polysulfide species diffusion owing to graphene introduction. To further demonstrate this explanation, Coulombic efficiencies of the graphene/S/PANI, graphene/S, and the pure S samples were calculated based on the repeated charge and discharge measurements, as shown in Fig.…”

“…The dissolution of intermediate products (polysulfides) in electrolyte during reaction reduces Coulombic efficiency and brings in a poor cycling life. [3][4][5] Thus, these issues must be urgently addressed to promote the practical application of Li-S battery.…”

“…6cwere measured at a scan rate of 0.2 mV s -1 . The CV curves demonstrated typical lithiation and delithiation peaks for Li-S cathodes [4]. Lithiation became stable after the first cycle.…”

Interwoven NiCo2O4 Nanosheet/Carbon Nanotube Composites as Highly Efficient Lithium−Sulfur Cathode Hosts

“…As expected, these sulfur host materials provide significantly improved cycling properties. However, these materials have a much lower conductivity than carbon materials, thus the chemically adsorbed polysulfides are reduced inefficiently on the hosts’ surfaces, resulting in relatively lower sulfur utilization . More recently, some polar metal oxides/sulfides with intrinsic good conductivity, such as Ti 4 O 7 nanoparticles and Co 9 S 8 nanosheets,, have been employed as new concept sulfur hosts, which can effectively entrap the polysulfide intermediates within the cathodes and at the same time achieve high sulfur utilization even at high current densities.…”