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Rational design of free-standing 3D porous MXene/rGO hybrid aerogels as polysulfide reservoirs for high-energy lithium-sulfur batteries

Journal Article


Abstract


  • Lithium-sulfur (Li-S) batteries with a high theoretical energy density are attracting increasing attention as promising candidates for next-generation energy storage systems. However, the insulating nature and undesirable shuttle effect of sulfur species dramatically impede their practical applications. Herein, a unique 3D porous Ti3C2Tx MXene/rGO (MX/G) hybrid aerogel is rationally designed and applied for the first time as a free-standing polysulfide reservoir to improve the overall performance of Li-S batteries. In this strategy, highly conductive MXene and rGO are integrated into a 3D interconnected porous aerogel structure with efficient 2D polar adsorption interfaces, enabling fast Li+/electron transport and strong chemical anchoring of lithium polysulfides as well as enhanced redox reaction kinetics. The robust MX/G aerogel electrodes deliver excellent electrochemical performances including a high capacity of 1270 mA h g-1 at 0.1C, an extended cycling life up to 500 cycles with a low capacity decay rate of 0.07% per cycle, and a high areal capacity of 5.27 mA h cm-2.

UOW Authors


  •   Wang, Guoxiu (external author)

Publication Date


  • 2019

Citation


  • Song, J., Guo, X., Zhang, J., Chen, Y., Zhang, C., Luo, L., . . . Wang, G. (2019). Rational design of free-standing 3D porous MXene/rGO hybrid aerogels as polysulfide reservoirs for high-energy lithium-sulfur batteries. Journal of Materials Chemistry A, 7(11), 6507-6513. doi:10.1039/c9ta00212j

Scopus Eid


  • 2-s2.0-85062852809

Start Page


  • 6507

End Page


  • 6513

Volume


  • 7

Issue


  • 11

Abstract


  • Lithium-sulfur (Li-S) batteries with a high theoretical energy density are attracting increasing attention as promising candidates for next-generation energy storage systems. However, the insulating nature and undesirable shuttle effect of sulfur species dramatically impede their practical applications. Herein, a unique 3D porous Ti3C2Tx MXene/rGO (MX/G) hybrid aerogel is rationally designed and applied for the first time as a free-standing polysulfide reservoir to improve the overall performance of Li-S batteries. In this strategy, highly conductive MXene and rGO are integrated into a 3D interconnected porous aerogel structure with efficient 2D polar adsorption interfaces, enabling fast Li+/electron transport and strong chemical anchoring of lithium polysulfides as well as enhanced redox reaction kinetics. The robust MX/G aerogel electrodes deliver excellent electrochemical performances including a high capacity of 1270 mA h g-1 at 0.1C, an extended cycling life up to 500 cycles with a low capacity decay rate of 0.07% per cycle, and a high areal capacity of 5.27 mA h cm-2.

UOW Authors


  •   Wang, Guoxiu (external author)

Publication Date


  • 2019

Citation


  • Song, J., Guo, X., Zhang, J., Chen, Y., Zhang, C., Luo, L., . . . Wang, G. (2019). Rational design of free-standing 3D porous MXene/rGO hybrid aerogels as polysulfide reservoirs for high-energy lithium-sulfur batteries. Journal of Materials Chemistry A, 7(11), 6507-6513. doi:10.1039/c9ta00212j

Scopus Eid


  • 2-s2.0-85062852809

Start Page


  • 6507

End Page


  • 6513

Volume


  • 7

Issue


  • 11