Vanadium nitride/reduced graphene oxide composite interlayer with dual lithium-polysulfide adsorption effect for lithium-sulfur batteries

Lithium-sulfur batteries (LSBs) have been developed as next-generation power sources owing to their high theoretical capacities and energy densities, cost effectiveness, and abundance. However, the low electrical conductivity of sulfur in the cathode and the dissolution of lithium polysulfides (LiPS...

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Published inJournal of alloys and compounds Vol. 960; p. 170812
Main Authors Park, Yu-Yeon, Moon, Sang-Hyun, Park, Deok-Hye, Shin, Jae-Hoon, Kim, Ji-Hwan, Jang, Jae-Sung, Kim, Sung-Beom, Lee, Sung-Nam, Park, Kyung-Won
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.10.2023
Subjects
Interlayer
Lithium sulfur batteries
Redox reaction
Reduced graphene oxide
Shuttle effect
Vanadium nitride
Interlayer
Reduced graphene oxide
Shuttle effect
Lithium sulfur batteries
Vanadium nitride
Redox reaction
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Summary:Lithium-sulfur batteries (LSBs) have been developed as next-generation power sources owing to their high theoretical capacities and energy densities, cost effectiveness, and abundance. However, the low electrical conductivity of sulfur in the cathode and the dissolution of lithium polysulfides (LiPS) into the liquid electrolyte are challenging issues that deteriorate both capacity and energy density. Herein, a porous vanadium nitride and reduced graphene oxide (VN/rGO) composite is prepared as an LSB interlayer that enhances conversion and redox reactions and increases sulfur utilization. Polar VN in the VN/rGO interlayer chemically adsorbs LiPS while rGO provides excellent electrical conduction and a high specific surface area for the physical adsorption of LiPS. The dual LiPS adsorption effect of VN/rGO suppresses shuttle effect and enhances electrochemical performance, leading to specific capacities of 1025 and 693 mA h g−1 at 0.5 and 2 C, respectively, and a retention of 81 % at 0.5 C after 200 cycles. [Display omitted] •VN/rGO composite is prepared as an LSB interlayer for LSBs.•Polar VN in the VN/rGO interlayer chemically adsorbs LiPS.•rGO provides excellent electrical conduction and the physical adsorption of LiPS.•LSB with VN/rGO exhibits the enhanced electrochemical performance.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2023.170812