共溅法制备锂离子电池Sn-Al/Cu复合薄膜及其电化学性能
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摘要
采用磁控溅射共溅法,在铜箔和泡沫铜基底上分别制备了平面和三维网状结构的Sn-Al/Cu复合薄膜.表征了其结构,并研究了其作为锂离子电池负极材料的电化学性能.结果表明,三维网状结构的电化学性能明显优于平面复合薄膜,表现出很好的循环性能和倍率性能:以600 mA/g电流密度充放电,三维网状结构的复合薄膜有较好的容量保持率,循环50周后容量保持在410 mA·h/g;以2000 mA/g电流密度充放电,再以500 mA/g电流密度进行充放电,三维网状结构的复合薄膜仍有464 mA·h/g的放电容量.三维网状结构的Sn-Al复合薄膜能抑制充放电时带来的体积膨胀,较大的表面积和粗糙表面可以使其与锂充分反应,改善其电化学性能.
Sn-Al /Cu composite thin films with planar and three dimensional( 3D) network structures,which were prepared by co-sputtering method on copper foil or foam,were used as the anode materials of Li-ion batteries. The phase structure and surface morphology of Sn-Al composite thin films were characterized by X-ray diffraction( XRD) and scanning electron microscopy( SEM). The electrochemical performance of Sn-Al composite thin films was evaluated with charge /discharge and electrochemical impedance spectroscopy( EIS) at room temperature. The results showed that Sn-Al composite thin films with 3D network structure displayed a capacity of 410 mA·h /g after 50 cycles at a current density of 600 mA /g,and a capacity of 464 mA·h /g at a current density of 2000 mA /g. The improved electrochemical performance such as cycling stability and columbic efficiency is attributed to the 3D network structure,which can obviously restrain the volume change of Sn-Al composite thin film during the insertion /extraction process of lithium ion. In addition,copper foam with large specific surface area and rough surface can promote the reaction with lithium sufficiently.
Sn-Al /Cu composite thin films with planar and three dimensional( 3D) network structures,which were prepared by co-sputtering method on copper foil or foam,were used as the anode materials of Li-ion batteries. The phase structure and surface morphology of Sn-Al composite thin films were characterized by X-ray diffraction( XRD) and scanning electron microscopy( SEM). The electrochemical performance of Sn-Al composite thin films was evaluated with charge /discharge and electrochemical impedance spectroscopy( EIS) at room temperature. The results showed that Sn-Al composite thin films with 3D network structure displayed a capacity of 410 mA·h /g after 50 cycles at a current density of 600 mA /g,and a capacity of 464 mA·h /g at a current density of 2000 mA /g. The improved electrochemical performance such as cycling stability and columbic efficiency is attributed to the 3D network structure,which can obviously restrain the volume change of Sn-Al composite thin film during the insertion /extraction process of lithium ion. In addition,copper foam with large specific surface area and rough surface can promote the reaction with lithium sufficiently.
引文
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[6]Xue L.,Fu Z.,Yao Y.,Huang T.,Yu A.,Electrochim.Acta,2010,55,7310—7314
[7]Zhuo K.,Jeong M.G.,Chung C.H.,J.Power Sources,2013,244,601—605
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[9]Zhang N.,Zhao Q.,Han X.P.,Yang J.G.,Chen J.,Nanoscale,2014,6,2827—2832
[10]Kim R.H.,Nam D.H.,Kwon H.S.,J.Power Sources,2010,195,5067—5070
[11]Park J.W.,Eom J.Y.,Kwon H.S.,Electrochim.Acta,2010,55,1825—1828
[12]Chiu K.F.,Lin H.C.,Lin K.M.,Lin T.Y.,Shieh D.T.,J.Electrochem.Soc.,2006,153,A1038—A1042
[13]Zhao L.Z.,Hu S.J.,Ru Q.,Li W.S.,Hou X.H.,Zeng R.H.,Lu D.S.,J.Power Sources,2008,184,481—484
[14]Song S.W.,Baek S.W.,ECS Trans.,2008,11,71—78
[15]Hu R.Z.,Zhang Y.,Zhu M.,Electrochim.Acta,2008,53,3377—3385
[16]Bai H.M.,Tao Z.L.,Cheng F.Y.,Chen J.,Electrochemistry,2011,17,43—47(白红美,陶占良,程方益,陈军.电化学,2011,17,43—47)
[17]Hamon Y.,Brousse T.,Jousse F.,Topart P.,Buvat P.,Schleich D.M.,J.Power Sources,2001,97/98,185—187
[18]Wang J.Z.,Du N.,Zhang H.,Yu J.X.,Yang D.R.,J.Phys.Chem.C,2011,115,23620—23624
[19]Li H.X.,Bai H.M.,Tao Z.L.,Chen J.,J.Power Sources,2012,217,102—107
[20]Yu H.W.,Hu S.J.,Hou X.H.,Ru Q.,Zhao L.Z.,Li W.S.,Materials Science Forum,2009,610—613,467—471
[21]Huggins R.A.,Solid State Ionics,1998,113—115,57—67
[22]Shin H.C.,Liu M.,Adv.Funct.Mater.,2005,15,582—586
[23]Ren X.N.,Liang J.,Tao Z.L.,Chen J.,Chem.J.Chinese Universities,2011,32(3),618—623(任晓宁,梁静,陶占良,陈军.高等学校化学学报,2011,32(3),618—623)
[24]Zhang Y.,Zhang X.G.,Zhang H.L,Zhao Z.G.,Li F.,Liu C.,Cheng H.M.,Electrochim.Acta,2006,51,4994—5000
[25]Song J.Y.,Lee H.H.,Wang Y.Y.,Wan C.C.,J.Power Sources,2002,111,255—257