Efficient Trapping and Catalytic Conversion of Polysulfides by VS4 Nanosites for Li–S Batteries

By Sizhe Wang, Haiyuan Chen, J. Liao, Qian Sun, Feipeng Zhao, Jing Luo, Xiaoting Lin, X. Niu, Mengqiang Wu, Ruying Li and 1 more. ACS Energy Letters, 2019

186 citations recorded by the source corpus.

Massive efforts have been devoted to enhancing performances of Li–S batteries to meet the requirements of practical applications. However, problems remain in enhancing the energy density and improving the cycle life. We present a free-standing structure of walnut-shaped VS4 nanosites combine with carbon nanotubes (NTs) as cathodes. In this framework, NT arrays provide high surface area and conductivity for high sulfur loadings, and VS4 nanosites facilitate trapping and catalytic conversions of lithium polysulfides. The synergistic effects of free-standing NT arrays and VS4 nanosites have enabled high rate capability up to 6 C and long-term cycling with a low decay rate of 0.037% up to 1200 cycles at 2 C. Moreover, the designed cathode can achieve high areal capacities up to ∼13 mAh·cm–2 and estimated gravimetric energy density of 243.4 Wh·kg–1 at a system level, demonstrating great potential in practical applications of Li–S batteries.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/0d7cb2f47ac7051e24cb279f8a4adf6ae637ae91