Three-in-one cathode host based on Nb₃O₈/graphene superlattice heterostructures for high-performance Li–S batteries

Abstract

Lithium-sulfur batteries have high promise for application in next-generation energy storage. However, further advances have been hindered by various intractable challenges, particularly three notorious problems: the “shuttle effect”, sluggish kinetics...

Robust Lithium–Sulfur Batteries Enabled by Highly Conductive WSe2‐Based Superlattices with Tunable Interlayer Space

“…The high electrical conductivity of the NG/WSe 2 samples is consistent with the graphitization of the WSe 2 interlayer polymer and it is critical for the effective use of the composite material as sulfur host in LSB cathodes. [ 15 ]…”

“…The high electrical conductivity of the NG/WSe 2 samples is consistent with the graphitization of the WSe 2 interlayer polymer and it is critical for the effective use of the composite material as sulfur host in LSB cathodes. [15] Figure 1i shows the Raman spectra of NG/WSe 2 and WSe 2 -800 samples. A peak at ≈250 cm −1 was observed in the two samples and it was attributed to the E 1 2g and A 1g modes of the WSe 2 2H phase, which correspond to the axial and lateral stretching, respectively.…”

“…Recently, the Sasaki group reported Nb 3 O 8 /graphene superlattice as a threein-one cathode host to prevent the lithium polysulfide (LiPS) shuttle effect, accelerate LiPS conversion, and promote Li 2 S nucleation, delivering superior electrochemical performance. [15] In terms of host material design, carbon materials and transitional metal dichalcogenides have been extensively investigated as cathode sulfur hosts to boost the performance of LSBs, but a single component host cannot meet the strict requirements of LSBs. [16][17][18][19] While graphene and other carbon supports can provide high specific surface area and electrical conductivity, their nonpolar surfaces are unable to anchor the soluble LiPS and catalyze their reaction.…”

Triple Conductive Wiring by Electron Doping, Chelation Coating and Electrochemical Conversion in Fluffy Nb2O5 Anodes for Fast‐Charging Li‐Ion Batteries

“…This enhancement is in accordance with the better rate performance for the formers, and is ascribed to the coral-like porous electrode structure (with higher specific area surface), defect and coating reinforced charge transport pathways. [51,52] Electrochemical impedance spectroscopy (EIS) was employed to further explore the evolution of electrochemical kinetics after the introduction of cobalt and carbon layer. Before the EIS measurement, the Li/PDA-Co-NbO, Li/Co-NbO and Li/P-NbO cells were cycled for 5 cycles at 100 mA g −1 in advance to stabilize the solid electrolyte interphase (SEI).…”

“…This enhancement is in accordance with the better rate performance for the formers, and is ascribed to the coral‐like porous electrode structure (with higher specific area surface), defect and coating reinforced charge transport pathways. [ 51,52 ]…”