Enhanced electrochemical kinetics in lithium-sulfur batteries by using carbon nanofibers/manganese dioxide composite as a bifunctional coating on sulfur cathode

Construction of ultrathin MnO2 decorated graphene/carbon nanotube nanocomposites as efficient sulfur hosts for high-performance lithium–sulfur batteries

“…The cycling performance of G/CNT@MnO 2 @S cathode was compared with other related state-of-the-art cathodes based on carbon/MnO 2 host materials (Table S2 †). 19,23,25,41,43,46,[50][51][52] Apparently, the G/CNT@MnO 2 @S cathode exhibits excellent cycling stability. Especially, the cathode exhibits a high capacity retention of 84.1% and 77.9% at a rate of 0.1C and 1C aer cycling, respectively, which is comparable to or even better than almost all of previously reported results listed in Table S2.…”

“…17 Liu and co-workers proved the enhanced electrochemical kinetics by using carbon nanobers supported MnO 2 composite. 23 Ultrathin MnO 2 was employed in Li-S batteries and achieved a high capacity retention of 76.1% at 0.2C aer 100 cycles. 24 Furthermore, large surface area, and uniform distribution of MnO 2 were also conrmed to enhance the adsorption ability towards LiPSs and facilitate the lithium ion diffusion.…”

Fabrication of a Light‐Weight Dual‐Function Modified Separator towards High‐Performance Lithium‐Sulfur Batteries

“…To quantify how much the modified separator promotes Li ion transference, a series of CV tests are conducted on cells with CB/PEDOT:PSS interlayer at different scanning rates (Figure ). All the cathodic and anodic peak currents are linear with the square root of scan rate (Figure b, d), indicating that the reactions are diffusion‐controlled . The Randles‐Sevcik equation was adopted to calculate the diffusion coefficients ( ) [Eq.…”

“…The Randles‐Sevcik equation was adopted to calculate the diffusion coefficients ( ) [Eq. ]: …”

“…Functionally, this additional layer benefits the Li−S batteries by providing enhanced electron conductivity of sulfur cathode, polysulfides adsorption and anode protection . Furthermore, to enhance the long‐term performance, researchers tried to apply materials with polarized surface into the interlayer, especially some non‐conductive metal oxides, as an effective way to anchor the dissolved active materials over many cycles . Some conductive polymers have also been reported as the polysulfides trapping materials, such as polyaniline (PANi), poly(3,4‐ethylene‐dioxythiophene) (PEDOT) and polypyrrole (PPy) .…”