Abstract: In order to inhibit the dissolution and diffusion of polysulphides and improve the electrochemical properties of lithium-sulfur (Li-S) batteries, the porous carbon nanosheets (PC) and multi-walled carbon nanotubes (MWCNTs) were combined to form a novel three-dimensional porous carbon nanosheet (PC/CNT) interlayer to capture soluble polysulfides. MWCNTs provide efficient conductive channels and maintain the integrity of the cathode structure; One-dimensional MWCNTs and two-dimensional porous carbon nanosheets form a three-dimensional interconnected structure that facilitates rapid electrical/ion transmission. The structures and properties were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The electrochemical test results show that the first discharge capacity of PC/CNT interlayer high performance Li-S battery reached 1 311 mAh/g at 0.05C rate, and the utilization rate of active material was as high as 78.8%. After 5 cycles at 2C rate, the discharge specific capacity still reached 941 mAh/g, which was 71.8% of the first specific capacity, and the coulomb efficiency remained at 96%,showing good rate and cycle performance.
1 Zhao Q, Zhu Q Z, An Y B,et al. Applied Surface Science, 2018,440,770. 2 Luo L Y, Qin X Y, Wu J X, et al. Journal of Materials Chemistry A, 2018,6(18),8612. 3 Yang K, Zhong L, Guan R, et al. Applied Surface Science, 2018,441,914. 4 Yan L J, Luo N N, Kong W B, et al. Journal of Power Sources, 2018,389,169. 5 Zhang A Y, Fang X, Shen C F, et al. Nano Research, 2018,11(6),3340. 6 Tang H, Yao S S, Xue S K, et al. Electrochimica Acta, 2018,263,158. 7 Li Z, Ma Z L, Wang Y Y, et al. Science Bulletin, 2018,63(3),169. 8 Mikhaylik Y V, Akridge J R. Journal of Electrochemical Society, 2004,151(151), A1969. 9 Hofmann A F, Fronczek D N, Bessler W G. Journal of Power Sources,2014,259(259), 300. 10 Li Z, Ma Z L, Wang Y Y, et al. Science Bulletin, 2018,63(3), 169. 11 Guo Y, Zhang Y, Zhang Y. Journal of Materials Chemistry A, 2018, 6(40),19358. 12 Fu X W, Scudiero L, Zhong W H. Journal of Materials Chemistry A, DOI:10.1039/c8ta11384j. 13 Luo C, Niu S, Zhou G, et al. Chemical Communications, 2016, 52(82), 121433. 14 Guo J C, Xu Y H, Wang C S. Nano Letters, 2011,11(10), 4288. 15 Hu N N, Lv X S, Dai Y, et al. ACS Applied Materials & Interfaces, 2018, 10(22),18665. 16 Tang X N, Sun Z H, Yang H C, et al. Journal of Energy Chemistry, 2019,31,119. 17 Zu C X, Manthiram A. Advanced Energy Materials, 2013, 3(8), 1008. 18 Xiao Z B, Yang Z, Wang L, et al. Advanced Materials, 2015, 27(18), 2891. 19 Zhou Z B, Xu Y H, Liu W G. Journal of Alloys & Compounds, 2010, 493(1), 636. 20 Cleland W W. Biochemistry, 1964,3(4), 480. 21 Liang G M, Wu J X, Qin X Y, et al. ACS Applied Materials & Interfaces, 2016, 8(35), 23105. 22 Li Y J, Zhan H, Liu S Q, et al. Journal of Power Sources, 2010, 195(9), 2945. 23 Liu M K, Yang Z B, Hao S, et al. Nano Research, 2016, 9(12), 3735.
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2020, Vol. 34 
