Abstract: Lithium sulfur battery with its high theoretical specific capacity and specific energy has provoke intensive attention, and becomes one of the research hotspots. As one of the essential ingredients for lithium-sulfur batteries, separator is the crucial factor for the performance promotion. At present, the research of modifying separator mainly focus on the design and synthesis of high performance coating materials as well as the exploitation of new separator materials. The present paper elaborates the latest research progress of modifying separator for lithium-sulfur batteries is introduced from five aspects: carbon coating separator, element-doped carbon coating separator, metal oxide/carbon composite coating separator, new membrane materials and multilayer separator. It also suggests the significance of separator modification for raising conductivity, inhibiting shuttle effect and mitigating corrosion of lit-hium electrode,and moreover, for improving the electrochemical properties of Li-S cells.
1 Du W C, Yin Y X, Zeng X X, et al. Wet chemistry synthesis of multidimensional nanocarbon-sulfur hybrid materials with ultrahigh sulfur loading for lithium-sulfur batteries[J].ACS Applied Materials & Interfaces,2016,8(6):3584. 2 Xiao Z, Yang Z, Wang L, et al. A lightweight TiO2/graphene interlayer, applied as a highly effective polysulfide absorbent for fast, long-life lithium-sulfur batteries[J].Advanced Materials,2015,27(18):2891. 3 Hu J J, Long G K, Liu S, et al. A LiFSI-LiTFSI binary-salt electrolyte to achieve high capacity and cycle stability for a Li-S battery[J].Chemical Communications,2014,50(93):14647. 4 Wang L, Wang Y, Xia Y Y. Towards high performance lithium-ion sulfur battery based on Li2S cathode using dual-phase electrolyte[J].Energy & Environmental Science,2015,8(5):1551. 5 Mikhaylik Y V, Akridge J R. Polysulfide shuttle study in the Li/S battery system[J].Journal of the Electrochemical Society,2004,151(151):A1969. 6 Busche M R, Adelhelm P, Sommer H, et al. Systematical electrochemical study on the parasitic shuttle-effect inlithium-sulfur-cells at different temperatures and different rates[J].Journal of Power Sources,2014,259:289. 7 Junghoon K, Dong-Ju L, Hun-Gi J, et al. An advanced lithium-sulfur battery[J].Advanced Functional Materials,2013,23(8):1076. 8 Yang Y, Zheng G, Cui Y. Nanostructured sulfur cathodes[J]. Chemical Society Reviews, 2013, 42(7):3018. 9 Barchasz C, Leprêtre J C, Alloin F, et al. New insights into the li-miting parameters of the Li/S rechargeable cell[J].Journal of Power Sources,2012,199(1):322. 10Yan Y, Yin Y X, Xin S, et al. High-safety lithium-sulfur battery with prelithiated Si/C anode and ionic liquid electrolyte[J].Electrochimca Acta,2013,91(3):58. 11Caas N A, Hirose K, Pascucci B, et al. Investigations of lithium-sulfur batteries using electrochemical impedance spectroscopy[J].Electrochimca Acta,2013,97(5):42. 12Zhi W S, Li W, Cha J J, et al. Sulphur-TiO2 yolk-shell nanoarchitecture with internal void space for long-cycle lithium-sulphur batte-ries[J].Nature Communications,2012,4(4):1331. 13 Tang H, Yao S, Jing M, et al. Mg0.6Ni0.4O hollow nanofibers prepared by electrospinning as additive for improving electrochemical performance of lithium-sulfur batteries[J].Journal of Alloys and Compounds,2015,650:351. 14 Gong Z, Wu Q, Wang F, et al. A hierarchical micro/mesoporous carbon fiber/sulfur composite for high-performance lithium-sulfur batteries[J].RSC Advances,2016,6(44):37443. 15 Lee J, Hwang T, Lee Y, et al. Coating of sulfur particles with manganese oxide nanowires as a cathode material in lithium-sulfur batteries[J].Materials Letters,2015,158:132. 16 Deng W, Hu A, Chen X, et al. Sulfur-impregnated 3D hierarchical porous nitrogen-doped aligned carbon nanotubes as high-performance cathode for lithium-sulfur batteries[J].Journal of Power Sources,2016,322:138. 17 Nersisyan H H, Joo S H, Yoo B U, et al. Combustion-mediated synthesis of hollow carbon nanospheres for high-performance cathode material in lithium-sulfur battery[J].Carbon,2016,103:255. 18 Nitze F, Fossum K, Xiong S, et al. Sulfur-doped ordered mesoporous carbons: A stability-improving sulfur host for lithium-sulfur battery cathodes[J].Journal of Power Sources,2016,317:112. 19 Li H, Sun L, Wang G. Self-assembly of polyethylene glycol-grafted carbon nanotube/sulfur composite with nest-like structure for high performance lithium-sulfur batteries[J].ACS Applied Materials & Interfaces,2016,8(9):6061. 20Wei P, Fan M Q, Chen H C, et al. Enhanced cycle performance of hollow polyaniline sphere/sulfur composite in comparison with pure sulfur for lithium-sulfur batteries[J].Renewable Energy,2016,86:148. 21Fan C Y, Yuan H, Li H, et al. The effective design of polysulfides trapped separator at the molecular level for high-energy-density Li-S batteries[J].ACS Applied Materials & Interfaces,2016,8(25):16108. 22Rehman S, Guo S, Hou Y. Porous carbon spheres: Rational design of Si/SiO2@hierarchical porous carbon spheres as efficient polysulfide reservoirs for high-performance Li-S battery[J].Advanced Mate-rials,2016,28(16):3167. 23 Jin Z, Xie K, Hong X, et al. Capacity fading mechanism in lithium sulfur cells using poly(ethylene glycol)-borate ester as plasticizer for polymer electrolytes[J].Journal of Power Sources,2013,242(22):478. 24 Yang Y, Sun W, Zhang J, et al. High rate and stable cycling of lit-hium-sulfur batteries with carbon fiber cloth interlayer[J].Electrochimca Acta,2016,209:691. 25 Zhang N, Liu M, Chen Y. Effect of pore structure of the coconut shell actived carbon on the performance of Li-S batteries[J]. Mate-rials Review B:Research Papers,2016,30(3):52(in Chinese). 张娜,刘敏,陈永.椰壳活性炭孔结构对Li-S电池性能的影响[J].材料导报:研究篇,2016,30(3):52. 26 Yao H, Yan K, Li W, et al. Improved lithium-sulfur batteries with a conductive coating on the separator to prevent the accumulation of inactive S-related species at the cathode-separator interface[J].Energy & Environmental Science,2014,7(10):3381. 27 Zhang Z, Lai Y, Zhang Z, et al. A functional carbon layer-coated separator for high performance lithium sulfur batteries[J].Solid State Ionics,2015,278:166. 28 Zhou G, Li L, Wang D, et al. A flexible sulfur-graphene-polypropy-lene separator integrated electrode for advanced Li-S batteries[J].Advanced Materials,2014,27(4):641. 29 Liu N, Huang B, Wang W, et al. Modified separator using thin carbon layer obtained from its cathode for advanced lithium sulfur batteries[J].ACS Applied Materials & Interfaces,2016,8(25):16101. 30Zhou Q X, Xiao J P, Wang W D, et al. Progress of the application of carbon nanotubes[J].Chemical Industry and Engineering Progress,2006,25(7):750(in Chinese). 周庆祥,肖军平,汪卫东,等.碳纳米管应用研究进展[J].化工进展,2006,25(7):750. 31Bolotin K I, Sikes K J, Jiang Z, et al. Ultrahigh electron mobility in suspended graphene[J].Solid State Communications,2008,146(9-10):351. 32Kim K S, Zhao Y, Jang H, et al. Large-scale pattern growth of graphene films for stretchable transparent electrodes[J].Nature,2009,457(7230):706. 33 Zhao D, Qian X, Jin L, et al. Separator modified by ketjen black for enhanced electrochemical performance of lithium sulfur batteries[J].RSC Advances,2016,6(17):13680. 34 Wang Q, Wen Z, Yang J, et al. Electronic and ionic co-conductive coating on the separator towards high-performance lithium-sulfur batteries[J].Journal of Power Sources,2016,306:347. 35 Wei H, Ma J, Li B, et al. Enhanced cycle performance of lithium-sulfur batteries using a separator modified with a PVDF-C layer[J].ACS Applied Materials & Interfaces,2014,6(22):20276. 36 Chung S H, Manthiram A. High-performance Li-S batteries with an ultra-lightweight MWCNT-coated separator[J].Journal of Physical Chemistry Letters,2014,5(11):1978. 37 Chung S, Manthiram A. Bifunctional separator with a light-weight carbon-coating for dynamically and statically stable lithium-sulfur batteries[J].Advanced Functional Materials,2015,24(33):5299. 38 Balach J, Jaumann T, Klose M, et al. Improved cycling stability of lithium-sulfur batteries using a polypropylene-supported nitrogen-doped mesoporous carbon hybrid separator as polysulfide adsorbent[J].Journal of Power Sources,2016,303:317. 39 Qie L, Chen W M, Wang Z H, et al. Nitrogen-doped porous carbon nanofiber webs as anodes for lithium ion batteries with a superhigh capacity and rate capability[J].Advanced Materials,2012,24(15):2047. 40Zhou X, Liao Q, Tang J, et al. A high-level N-doped porous carbon nanowire modified separator for long-life lithium-sulfur batteries[J].Journal of Electroanalytical Chemistry,2016,768:55. 41Ye H, Yin Y X, Xin S, et al. Tuning the porous structure of carbon hosts for loading sulfur toward long lifespan cathode materials for Li-S batteries[J].Journal of Materials Chemistry A,2013,1(22):6602. 42Zhang Z, Wang G, Lai Y, et al. Nitrogen-doped porous hollow carbon sphere-decorated separators for advanced lithium-sulfur batteries[J].Journal of Power Sources,2015,300:157. 43 Balach J, Singh H K, Gomoll S, et al. Synergistically enhanced polysulfide chemisorption using a flexible hybrid separator with N and S dual-doped mesoporous carbon coating for advanced lithium-sulfur batteries[J].ACS Applied Materials & Interfaces,2016,8(23):14586. 44 Li Z, Jiang Q, Ma Z, et al. Oxygen plasma modified separator for lithium sulfur battery[J].RSC Advances,2015,5(97):79473. 45 Wang L. Boron-doped graphene as interlayer for lithium-sulfur batteries[J].Technology & Development of Chemical Industry,2016,45(5):10(in Chinese). 王璐.硼掺杂石墨烯用作锂硫电池夹层材料的研究[J].化工技术与开发,2016,45(5):10. 46 Zhang Y G, Wang C Y, Yan P. Modification on carbon doped with boron as anode materials for lithium ion secondary battery[J].Che-mical Industry and Engineering Progress,2004,23(3):248(in Chinese). 张永刚,王成扬,闫裴.锂离子二次电池用负极炭材料的掺硼改性[J].化工进展,2004,23(3):248. 47 Xu C, Zhou H, Fu C, et al. Hydrothermal synthesis of boron-doped unzipped carbon nanotubes/sulfur composite for high-performance lithium-sulfur batteries[J].Electrochimca Acta,2017,232:156. 48 Xie Y, Meng Z, Cai T, et al. Effect of boron-doping on the graphene aerogel used as cathode for the lithium-sulfur battery[J].ACS Applied Materials & Interfaces,2015,7(45):25202. 49 Guo M Q, Huang J Q, Kong X Y, et al. Hydrothermal synthesis of porous phosphorus-doped carbon nanotubes and their use in the oxygen reduction reaction and lithium-sulfur batteries[J].New Carbon Materials,2016,31(3):352. 50Zhang Z, Lai Y, Zhang Z, et al. Al2O3-coated porous separator for enhanced electrochemical performance of lithium sulfur batteries[J].Electrochimca Acta,2014,129(16):55. 51Song R, Fang R, Wen L, et al. A trilayer separator with dual function for high performance lithium-sulfur batteries[J].Journal of Po-wer Sources,2016,301:179. 52Balach J, Jaumann T, Mühlenhoff S, et al. Enhanced polysulphide redox reaction using a RuO2 nanoparticle-decorated mesoporous carbon as functional separator coating for advanced lithium-sulphur batteries[J].Chemical Communications,2016,52(52):8134. 53 Qian X, Jin L, Zhao D, et al. Ketjen Black-MnO composite coated separator for high performance rechargeable lithium-sulfur battery[J].Electrochimca Acta,2016,192:346. 54 Ma G Q, Wen Z Y, Wang Q S, et al. Effects of CeO2 nano-crystal on electrochemical properties of lithium/sulfur batteries[J].Journal of Inorganic Materials,2015,30(9):913(in Chinese). 马国强,温兆银,王清松,等.CeO2纳米晶的添加对锂硫电池电化学性能的影响[J].无机材料学报,2015,30(9):913. 55 Bing D, Shen L, Xu G, et al. Encapsulating sulfur into mesoporous TiO2, host as a high performance cathode for lithium-sulfur battery[J].Electrochimca Acta,2013,107(10):78. 56 Zhang Y, Feng H, Wu X, et al. Progress of electrochemical capacitor electrode materials: A review[J].International Journal of Hydrogen Energy,2009,34(11):4889. 57 Kim C S, Guerfi A, Hovington P, et al. Facile dry synthesis of sulfur-LiFePO4, core-shell composite for the scalable fabrication of lithium/sulfur batteries[J].Electrochemistry Communications,2013,32(32):35. 58 Wang Y, Zhan H, Hu J, et al. Wet-laid non-woven fabric for separator of lithium-ion battery[J].Journal of Power Sources,2009,189(1):616.59 Wang L, Liu J, Haller S, et al. A scalable hybrid separator for a high performance lithium-sulfur battery[J].Chemical Communications,2015,51(32):6996. 60Zhu J, Yanilmaz M, Fu K, et al. Understanding glass fiber membrane used as a novel separator for lithium-sulfur batteries[J].Journal of Membrane Science,2016,504:89. 61Zhu J, Ge Y, Kim D, et al. A novel separator coated by carbon for achieving exceptional high performance lithium-sulfur batteries[J].Nano Energy,2015,20:176. 62Jin J, Lin C, Zhang W, et al. Few-layered Ti3C2 nanosheet/glass fiber composite separator as lithium polysulphide reservoir for high-performance lithium-sulfur battery[J].Journal of Materials Chemistry A,2016,4(16):5993. 63 Yeon S H, Ahn W, Shin K H, et al. Carbide-derived carbon/sulfur composite cathode for multi-layer separator assembled Li-S battery[J].Korean Journal of Chemical Engineering,2015,32(5):867.