Rational valence modulation of bimetallic carbide assisted by defect engineering to enhance polysulfide conversion for lithium–sulfur batteries

Abstract

The reasonable design of metal compound electrocatalysts is proved to be a good way to accelerate the sluggish conversion kinetics of polysulfides for high performance lithium-sulfur (Li-S) batteries. Since metal...

Electrochemical Kinetic Modulators in Lithium–Sulfur Batteries: From Defect‐Rich Catalysts to Single Atomic Catalysts

“…Defects in catalysts play an importance role in tuning the intrinsic electronic structure to polar property. [ 151–158 ] The active defect‐rich catalysts are beneficial to modulate the catalytic activity for the LiPS conversion. Lin et al.…”

“…Defects in catalysts play an importance role in tuning the intrinsic electronic structure to polar property. [151][152][153][154][155][156][157][158] The active defect-rich catalysts are beneficial to modulate the catalytic activity for the LiPS conversion. Lin et al [148] initially put forward the ideas of using anionic-defected catalyst of MoS 2-x to enhance LiPS conversion kinetics so as to decrease their accumulation in the sulfur cathode and shuttling, which obviously improves the battery performance.…”

Function-directed design of battery separators based on microporous polyolefin membranes

“…Recently, metal phosphides, nitrides and carbides ( e.g. , NbN, 329 CoP, 330 Ni 3 ZnC 0.7 , 331 and Mo 2 C 332 ) have been used for the design of functional separators due to their metallic conductivity. Wang et al demonstrated that MoP 2 nanoparticles had high catalytic activity for PS, and thus the Li–S battery with the MoP 2 /CNT-coated separator exhibited a high reversible capacity and cycling stability.…”

Modulating the electronic structure of nanomaterials to enhance polysulfides confinement for advanced lithium–sulfur batteries

“…158 Since metal ions usually serve as the active sites to interact with polysuldes, optimizing their electronic and valence states is vital to enhance the catalytic activity, especially in sulfur redox reactions involving multiple electrons. 159 In addition, the metal atomdoping strategy shows metallic characteristics and even superconductivity, 160 which is very benecial to facilitate the redox reaction kinetics and increase the sulfur utilization efficiency for Li-S batteries. The single metal atom doped in carbon matrix is widely known as single-atom materials, which will be discussed separately in this review.…”