Nitrogen-doped graphitized porous carbon with embedded NiFe alloy nanoparticles to enhance electrochemical performance for lithium-sulfur batteries

Metallic FeCo clusters propelling the stepwise polysulfide conversion in lithium–sulfur batteries

“…S6b, † and they were assigned to the terminal sulfur (S T −1 ) and bridging sulfur (S B 0 ), respectively. 52 In contrast, various S peaks, including peaks corresponding to sulfur oxides (167.9 and 168.9 eV) and metal-S (166.1 eV) were present aer the sorption of Li 2 S 6 onto the FeCo/PNC sample. This implies that the FeCo/PNC sample promoted the conversion from polysuldes to Li 2 S. Additionally, both the S T −1 (163.1/163.4 eV) and S B 0 (164.0/164.7 eV) XPS peaks shied to higher binding energies, which agrees with the observations from the Fe/Co XPS 2p spectrum.…”

Advances of graphene-based aerogels and their modifications in lithium-sulfur batteries

“…Doping of graphene by heteroatoms is an efficient technique to design the structures capable of trapping LiPSs and improve the chemical binding of sulfur and its species to the carbon host, which is vital for elimination of shuttle effect [124][125][126][127][128][129]. To ensure the strong binding of carbon host to LiPSs, the requirement for Lewis base interaction with the Lewis acidic LiPSs can be fulfilled by the existence of lone pair electron of the doping atom.…”

Kinetic Acceleration of Lithium Polysulfide Conversion via a Copper–Iridium Alloying Catalytic Strategy in Li–S Batteries

“…Nowadays, the alloying strategy through the synergistic effect of different components has been demonstrated to effectively replace vulnerable metal–carbon interactions through metal-to-metal bonding to enhance the catalytic activity . In recent studies, Gao et al successfully fabricated the N-rich carbon embedded with Ni–Fe alloy nanoparticles (NiFe@NC) for the cathode of LSBs, and the S/NiFe@NC electrode still maintained a respectable specific capacity of 565 mA h g –1 with a low decay rate of 0.059% each cycling in 500 cycles at 1 C . A multistage composite made of a CoSn alloy and Co-intercalated N-doped carbon (Co-NC) was created by Wang et al.…”

“…days, the alloying strategy through the synergistic effect of different components has been demonstrated to effectively replace vulnerable metal−carbon interactions through metalto-metal bonding to enhance the catalytic activity. 12 In recent studies, Gao et al successfully fabricated the N-rich carbon embedded with Ni−Fe alloy nanoparticles (NiFe@NC) for the cathode of LSBs, and the S/NiFe@NC electrode still maintained a respectable specific capacity of 565 mA h g −1 with a low decay rate of 0.059% each cycling in 500 cycles at 1 C. 13 A multistage composite made of a CoSn alloy and Cointercalated N-doped carbon (Co-NC) was created by Wang et al The 3DOM Co-NC@CoSn composite provided an initial specific capacity of 1034 mA h g −1 at 0.2 C, and a specific capacity of 885 mA h g −1 (85.6% retention rate) can still be acquired over 100 cycles. 14 Gao et al designed a CoFe alloydecorated interlayer with numerous adsorption and catalysis active sites and achieved good electrochemical performance, which maintained a specific capacity of 531.1 mA h g −1 with a satisfactory low specific capacity decline of 0.08% per cycle over 500 long cycling at 1 C. 15 Unfortunately, the electrochemical performance of these studies was still not satisfactory.…”