以热处理方法由单质硫与超导炭黑制备硫含量为59%的硫-超导炭黑复合材料.X射线衍射、扫描电镜测试表明,单质硫均匀地分散在高比表面积的超导炭黑中.如于电解液中添加室温离子液体,则可有效减弱复合材料中多硫化物在电解液的穿梭效应,提高硫复合材料的电化学性能.充放电测试表明,该硫-超导炭黑复合材料在含有离子液体的电解液中循环50周后,容量仍保持483.6mAh/g.
The sulfur-super conductive carbon black composite was prepared as cathode material of lithium/sulfur battery.The composite was characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),and electrochemical impedance spectroscopy(EIS).The sulfur composite shows a high discharge capacity and a good cycle performance in electrolyte mixed with 50% of room temperature ionic liquid.In particular,the discharge capacity of the composite was stabilized at 483.6 mAh/g after 50 cycles.
[1]Jin B,Kim J U,Gu H B.Electrochemical properties of lithium-sulfur batteries[J].J Power Sources,2003,117:148-152.
[2]Peled E,Gorenshtein A,Segal M,et al.Rechargeable lithium-sulfur battery[J].J Power Sources,1989,26:269-271.
[3]Rauh R D,Abraham K M,Pearson G F,et al.A Lithi-um/dissolved sulfur battery with an organic electrolyte[J].J Electrochem Soc,1979,126:523-527.
[4]Yamin H,Gorenshtein A,Penciner J,et al.Lithium sul-fur battery:oxidation/reduction mechanisms of polysul-fides in THF solutions[J].J Electrochem Soc,1988,135:1045-1048.
[5]Jung Y J,Kim S.New approaches to improve cycle life characteristics of lithium-sulfur cells[J].Electrochem Commun,2007,9:249-254.
[6]Cheon S E,Ko K S,Cho J H,et al.Rechargeable lithium sulfur battery I.Structural change of sulfur cathode dur-ing discharge and dharge[J].J Electrochem Soc,2003,150:A796-A799.
[7]Mikhaylik Y V,Akridge J R.Polysulfide shuttle study in the Li/S battery system[J].J Electrochem Soc,2004,151:A1969-A1976.
[8]Yuan L X,Feng J K,Ai X P,et al.Improved discharge-ability and reversibility of sulfur cathode in a novel ionic liquid electrolyte[J].Electrochem Commun,2006,8:610-614.
[9]Wang J,Chew S Y,Zhao Z W,et al.Sulfur-mesoporous carbon composites in conjunction with a novel ionic liq-uid electrolyte for lithium rechargeable batteries[J].Carbon,2008,46:229-235.
[10]Wang J L,Yang J,Xie J Y,et al.A novel conductive polymer-sulfur composite cathode material for recharge-able lithium batteries[J].Adv Mater,2002,14:963-965.
[11]Wang J L,Yang J,Xie J Y,et al.Sulfur-carbon nano-composite as cathode for rechargeable lithium batterybased on gel electrolyte[J].Electrochem Commun,2002,4:499-502.
[12]Zheng W,Liu Y W,Hu X G,et al.Novel nanosized ad-sorbing sulfur composite cathode materials for the ad-vanced secondary lithium batteries[J].Electrochim Acta,2006,51:1330-1335.
[13]Lai C,Gao X P,Zhang B,et al.Synthesis and electro-chemical performance of sulfur/highly porous carbon composites[J].J Phys Chem C,2009,113:4712-4716.
[14]Zhang B,Lai C,Zhou Z,et al.Preparation and electro-chemical properties of sulfur-acetylene black compos-ites as cathode materials[J].Electrochimica Acta,2009,54:3708-3713.
