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

Sizhe Wang; Haiyuan Chen; Jiaxuan Liao; Qian Sun; Feipeng Zhao; Jing Luo; Xiaoting Lin; Xiaobin Niu; Mengqiang Wu; Ruying Li; Xueliang Sun;
University of Western Ontario; University of Electronic Science and Technology of China; University of Electronic Science and Technology of China; University of Western Ontario; University of Western Ontario; University of Western Ontario; University of Western Ontario; University of Electronic Science and Technology of China; University of Electronic Science and Technology of China; University of Western Ontario; University of Western Ontario
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Abstract AITranslate

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.

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DOI：https://doi.org/10.1021/acsenergylett.9b00076

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Citation Information:

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.

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GB/T 7714-2015 [1] Sizhe Wang, Haiyuan Chen, Jiaxuan Liao, et al. ACS Energy Letters, 2019(4). DOI:10.1021/acsenergylett.9b00076.
MLA [1] Sizhe Wang, et al., ACS Energy Letters, no. 4, 2019, https://doi.org/10.1021/acsenergylett.9b00076.
APA [1] Sizhe Wang, Haiyuan Chen, Jiaxuan Liao, Qian Sun, Feipeng Zhao, Jing Luo, Xiaoting Lin, Xiaobin Niu, Mengqiang Wu, Ruying Li, & Xueliang Sun. (2019). ACS Energy Letters(4). https://doi.org/10.1021/acsenergylett.9b00076
IEEE [1] Sizhe Wang, Haiyuan Chen, Jiaxuan Liao, Qian Sun, Feipeng Zhao, Jing Luo, Xiaoting Lin, Xiaobin Niu, Mengqiang Wu, Ruying Li, and Xueliang Sun, ACS Energy Letters, no. 4, 2019, doi: 10.1021/acsenergylett.9b00076.