V_2O_3空心球的制备及在锂硫电池中的应用
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摘要
在NH_3辅助下将制备的V_2O_5空心球高温还原为V_2O_3空心球,并利用透射电子显微镜、扫描电子显微镜、 X射线衍射和X射线光电子能谱等手段对材料的形貌与结构进行表征.将V_2O_3空心球与硫机械混合后,不经过熔融复合直接作为锂硫电池的正极材料.电化学测试结果显示,在0.2C倍率下,电池首次放电比容量达到1375 mA·h/g,循环100次后放电比容量可以维持在815 mA·h/g;在1C高倍率下,电池首次放电比容量为710 mA·h/g,经过500次循环后,放电比容量仍能达到530 mA·h/g,表明V_2O_3空心球的加入能够有效提高锂硫电池的循环性能.
The prepared V_2O_5 hollow spheres were reduced to V_2O_3 hollow spheres with the assistance of NH_3 at high temperature. The morphology and structure of the V_2O_3 hollow spheres were characterized by transmission electron microscopy(TEM), scanning electron microscopy(SEM), powder X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The powder of V_2O_3 hollow spheres and sulfur was mixed directly without further thermal treatment and the mixture was used as the cathode of lithium-sulfur batteries. The electrochemical test show that the initial capacity reaches 1375 mA·h/g and the capacity after 100 cycles is 815 mA·h/g at 0.2 C; even at 1 C, the initial capacity reaches 710 mA·h/g and the capacity after 500 cycles is 530 mA·h/g. The results indicate that the addition of V_2O_3 hollow sphere in the lithium sulfur battery can effectively improve the cycle performance.
The prepared V_2O_5 hollow spheres were reduced to V_2O_3 hollow spheres with the assistance of NH_3 at high temperature. The morphology and structure of the V_2O_3 hollow spheres were characterized by transmission electron microscopy(TEM), scanning electron microscopy(SEM), powder X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The powder of V_2O_3 hollow spheres and sulfur was mixed directly without further thermal treatment and the mixture was used as the cathode of lithium-sulfur batteries. The electrochemical test show that the initial capacity reaches 1375 mA·h/g and the capacity after 100 cycles is 815 mA·h/g at 0.2 C; even at 1 C, the initial capacity reaches 710 mA·h/g and the capacity after 500 cycles is 530 mA·h/g. The results indicate that the addition of V_2O_3 hollow sphere in the lithium sulfur battery can effectively improve the cycle performance.
引文
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[2] Ji L.,Rao M.,Zheng H.,J.Am.Chem.Soc.,2011,133(46),18522—18525
[3] Bruce P.G.,Freunberger S.A.,Hardwick L.J.,Tarascon J.M.,Nat.Mater.,2012,11,19—29
[4] Keqi Chung S.H.,Manthiram A.,Adv.Mater.,2014,26(9),1360—1365
[5] Seh Z.W.,Sun Y.,Zhang Q.,Chem.Soc.Rev.,2016,45(20),5605—5634
[6] Li Z.,Wu H.B.,Lou X.W.,Energy.Environ Sci.,2016,9(10),3061—3070
[7] Balogun M.S.,Qiu W.,Wang W.,Fang P.,Lu X.H.,Tong Y.X.,J.Mater.Chem.A,2015,3,1364—1387
[8] Manthiram A.,Fu Y.,Chung S.H.,Chem.Rev.,2014,114(23),11751—11787
[9] Xiong S.Z.,Xie K.,Hong X.B.,Chem.J.Chinese Universities,2011,32(11),2645—2649(熊仕昭,谢凯,洪晓斌.高等学校化学学报,2011,32(11),2645—2649)
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[11] Meng X.B.,Gao Q.M.,Chem.J.Chinese Universities,2014,35(8),1715—1719(孟宪斌,高秋明.高等学校化学学报,2014,35(8),1715—1719)
[12] Zhang K.,Zhao Q.,Tao X.,Nano Research,2013,6(1),38—46
[13] Elazari R.,Salitra G.,Garsuch A.,Panchenko A.,Aurbach D.,Adv.Mater.,2011,23(47),5641—5644
[14] Wang J.Z.,Lu L.,Choucair M.,Stride J.A.,Xu X.,Liu H.K.,J.Power Sources,2011,196(16),7030—7034
[15] Zhang B.,Qin X.,Li G.R.,Energy.Environ Sci.,2010,3(10),1531—1537
[16] Seh Z.W.,Li W.,Cha J.J.,Nat.Mater.,2013,4,1331—1336
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[20] Song Y.Z.,Zhao W.,Wei N.,Zhang L.,Ding F.,Liu Z.F.,Sun J.Y.,Nano Energy,2018,53,432—439
[21] Ma F.,Liang J.,Wang T.,Nanoscale,2018,10(12),5634—5641
[22] Goodenough J.B.,Annu.Rev.Mater.Sci.,1971,1,101—138
[23] Wu C.Z.,Xie Y.,Lei L.Y.,Hu S.Q.,Ouyang C.Z.,Adv.Mater.,2006,18(13),1727—1732
[24] Moulder J.F.,Stickle W.F.,Sobol P.E.,Bomben K.D.,Handbook of X-ray Photoelectron Spectroscopy,Perkin-Elmer Corporation.,Eden Prairie,1992
[25] Ma L.,Yuan H.,Zhang W.,Nano Letters,2017,17(12),7839—7846
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[28] Wang X.,Wang Z.,Chen L.,J.Power Sources,2013,242(22),65—69
[29] Zheng S.,Wen Y.,Zhu Y.,Adv.Energy Mater.,2014,4(16),1400482
[30] Niu X.,Wang X.,Wang D.,J.Mater.Chem.A,2015,3(33),17106—17112
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