Active Anchoring Polysulfides of ZnS‐Decorated Porous Carbon Aerogel for a High‐Performance Lithium‐Sulfur Battery

Abstract

A carbon aerogel composite modified with ZnS (ZnS-CA) was successfully prepared through a simple in situ synthesis and used as a cathode for lithium-sulfur batteries. The nanopore ZnS-CA composites with a high specific surface area and rich mesoporous structure exhibit stronger adsorption and immobilization ability for polysulfides. The ZnS-CA/S cathode materials offer excellent electrochemical performances with lasting cycling stability and high specific capacity. In particular, the 6ZnS-CA/S sample achieves an initial capacity of 1352 mAh g À 1 at 0.2 C and maintains a high capacity of 1119 mAh g À 1 after 100 cycles. Furthermore, after 300 long cycles, it still maintains a high capacity of 730 mAh g À 1 at 1 C. These excellent performance features are attributed to the strong affinity of ZnS for Li 2 S n species, thus polysulfide shuttling can be effectively inhibited from the cathode source. Furthermore, the strong adsorption energy between ZnS and polysulfides was validated by using first-principles theory calculations, which reveals the anchoring and catalytic mechanism.

ZnS nanolayer coated hollow carbon spheres with enhanced rate and cycling performance for Li-S batteries

“…However, the charge transfer resistance of HCS/S cathode without adding ZnS nanolayer increases significantly in the subsequent middle-frequency region, indicating the difficulty of charge transfer in the battery system. In contrast, the accelerated electrochemical process with ZnS coating could be attributed to the strong chemisorption and catalytic conversion effect to polysulfide that are also reported in other metal sulfur-based cathodes [37,55]. In the low-frequency region, the inclined line is a reflection of the Warburg impedance which relates to the diffusion rate of lithium ions.…”

Mo@ZIF-8 nanozyme preparation and its antibacterial property evaluation

“…As displayed in Figure 2D , the binding energy for Zn 2p3/2 and 2p1/2 were 1,021.8 and 1,044.8 eV, respectively. ( Hua et al, 2019 ).…”

Highly Interconnected Nanochannel and Silver, Nitrogen Co‐Doped Carbon Aerogel via Metal Organic Knot–Modifying as Active Polysulfide Immobilizer for Lithium–Sulfur Battery

“…To further prove the strong interaction ability between Ag 2 S and Li 2 S n ( n = 4, 6, 8) species, the adsorption energies ( E ads ) of Li 2 S n species on Ag 2 S (022) facet were obtained by DFT calculation. [ 42 ] Figure 8 a shows the most stable constructions of Li 2 S n ( n = 4, 6, 8), and the optimal configurations of Ag 2 S‐absorbed Li 2 S n species were shown in Figure 8b. It can be found that the adsorption energies of Li 2 S 8 , Li 2 S 6 , and Li 2 S 4 on Ag 2 S facet were −5.48, −4.75, and −3.86 eV, respectively.…”