Co/Co3O4-embedded N-doped hollow carbon composite derived from a bimetallic MOF/ZnO Core-shell template as a sulfur host for Li-S batteries

Conductive Al-Doped ZnO Framework Embedded with Catalytic Nanocages as a Multistage-Porous Sulfur Host in Lithium–Sulfur Batteries

“…Similar phenomena of peak migrations were observed from ZIF-8@AZO/S and AZO/S cathodes but with larger interval extents: the values for C 1 , C 2 , and A 2 peak migration are 0.031, 0.107 and 0.075 V, respectively, for ZIF-8@AZO/S and 0.034, 0.087, and 0.077 V, respectively, for AZO/S (Figure b,c). This implies that Co-NC@AZO exhibits the lowest polarization activation among the three cathodes, demonstrating the most efficient conversion kinetics of Li 2 S x . Note that a weak anodic peak at around 2.6 V can be found for the Co-NC@AZO/S and ZIF-8@AZO/S cathodes, which gradually disappears as the scan speed increases during the test.…”

“…This implies that Co-NC@AZO exhibits the lowest polarization activation among the three cathodes, demonstrating the most efficient conversion kinetics of Li 2 S x . 47 Note that a weak anodic peak at around 2.6 V can be found for the Co-NC@ AZO/S and ZIF-8@AZO/S cathodes, which gradually disappears as the scan speed increases during the test. This may be caused by an unknown reaction, which will be studied in detail in our future work.…”

Achieving Cycling Durability of Lithium–Sulfur Batteries via Capturing Polysulfides through a Three-Dimensional Interconnected Carbon Network Anchored with Ultrafine FeS Nanoparticles

“…Meanwhile, after the cycled lithium plates were immersed into a DME solvent for several hours, the supernatant was taken out for a UV–vis test. According to the UV–vis spectra shown in Figure S19, the weak peak of 3DC-FeS-650 in the visible range shows that few polysulfide anions exist in the solvent, but the 3DC interlayer shows a strong absorptive peak corresponding to polysulfide anions. , Consequently, the 3DC-FeS-650 interlayer shows great advantages in alleviating LiPS diffusion and the small irregular FeS may be desirable to enhance the electrochemical performance of Li–S batteries.…”

Nitrogen-doped porous carbon fiber/vertical graphene as an efficient polysulfide conversion catalyst for high-performance lithium–sulfur batteries

“…, Nb 2 O 5 , Fe 3 C, CoS 2 and Co 3 O 4 ) in carbon scaffolds. 13–16 Heteroatom doping, such as nitrogen doping, could provide a large number of polar sites, adsorbing polysulfides by forming Li–N bonds and catalyzing the conversion of polysulfides. 17–19 Although great progress has been made for Li–S batteries, they still face the challenges of low sulfur content (<70%) and low sulfur loading (<4.5 mg cm −2 ) for practical applications.…”