多壁碳纳米管夹层抑制锂硫电池穿梭效应
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摘要
以多壁碳纳米管(MWCNTs)薄膜作为锂硫电池正极片与隔膜之间的夹层,可抑制多硫化物的溶解和扩散,阻止穿梭效应,减小活性物质的损失,提高锂硫电池的容量和循环性能。本文利用透射电子显微镜(TEM)和扫描电镜(SEM)等进行结构和性能的表征。电化学测试结果表明,含MWCNTs夹层的锂硫电池在0.2C倍率首次放电比容量达到1352m A·h/g,首次库仑效率接近100%,循环20次后比容量还保持在1028m A·h/g。在1C、2C和5C倍率下充放电,电池比容量分别达到902m A·h/g、782m A·h/g和509m A·h/g。
Multi-walled carbon nanotubes(MWCNTs)film was used as the interlayer between the positive electrode and the separator to check the dissolution and dispersion of polydulfides,which reduced the loss of active material and improved the capacity and cycle performance of lithium-sulfur(Li-S)batteries. The morphology and structure are characterized by transmission electron microscopy(TEM)and scanning electron microscopy(SEM). The electrochemical test showed that the initial discharge capacity of the Li-S batteries with the MWCNTs interlayer reached 1352 m A·h/g and the Coulomb efficiency was close to 100%. The discharge capacity remained 1028 m A·h/g after 20 cycles. The batteries maintained specific capacities of 902 m A·h/g,782 m A·h/g and 509 m A·h/g at the current rate of 1 C,2 C and 5 C respectively.
Multi-walled carbon nanotubes(MWCNTs)film was used as the interlayer between the positive electrode and the separator to check the dissolution and dispersion of polydulfides,which reduced the loss of active material and improved the capacity and cycle performance of lithium-sulfur(Li-S)batteries. The morphology and structure are characterized by transmission electron microscopy(TEM)and scanning electron microscopy(SEM). The electrochemical test showed that the initial discharge capacity of the Li-S batteries with the MWCNTs interlayer reached 1352 m A·h/g and the Coulomb efficiency was close to 100%. The discharge capacity remained 1028 m A·h/g after 20 cycles. The batteries maintained specific capacities of 902 m A·h/g,782 m A·h/g and 509 m A·h/g at the current rate of 1 C,2 C and 5 C respectively.
引文
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[5]JI X,LEE K T,NAZAR L F.A highly ordered nanostructured carbon-sulphur,cathode for lithium-sulphur batteries[J].Nature Materials,2009,8(6):500-506.
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[7]ZHANG Q,WANG Y,SEH Z W,et al.Understanding the anchoring effect of two-dimensional layered materials for lithium-sulfur batteries[J].Nano Letters,2015,15(6):3780-3786.
[8]LIU W,JIANG J B,YANG K R,et al.Ultrathin dendrimer-graphene oxide composite film for stable cycling lithium-sulfur batteries[J].Proceedings of the National Academy of Sciences of the United States of America,2017,114(14):3578-3583.
[9]ZHANG K,QIN F,FANG J,et al.Nickel foam as interlayer to improve the performance of lithium-sulfur battery[J].Journal of Solid State Electrochemistry,2014,18(4):1025-1029.
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[11]WEI W,WANG J,ZHOU L,et al.CNT enhanced sulfur composite cathode material for high rate lithium battery[J].Electrochemistry Communications,2011,13(5):399-402.
[12]郑加飞,郑明波,李念武,等.石墨烯包覆碳纳米管-硫(CNT-S)复合材料及锂硫电池性能[J].无机化学学报,2013,29(7):1355-1360.ZHENG Jiafei,ZHENG Mingbo,LI Nianwu,et al.Preparation of graphene coated carbon nanotube-sulfur composite and its performance for lithium-sulfur battery[J].Chinese Journal of Inorganic Chemistry,2013,29(7):1355-1360.
[13]YU M,MA J,SONG H,et al.Atomic layer deposited Ti O2 on a nitrogen-doped graphene/sulfur electrode for high performance lithium-sulfur batteries[J].Energy&Environmental Science,2016,9(4):1495-1503.
[14]ZHAO M Q,ZHANG Q,HUANG J Q,et al.Unstacked double-layer templated graphene for high-rate lithium-sulphur batteries[J].Nature Communications,2014.DOI:10.1038/ncomms4410.
[15]HWANG Jang-Yeon,KIM Hee Min,LEE Sang-Kyu,et al.High-energy,high-rate,lithium-sulfur batteries:synergetic effect of hollow Ti O2-webbed carbon nanotubes and a dual functional carbon-paper interlayer[J].Advanced Energy Materials,2016,6(1).DOI:10.1002/aenm.201501480.
[16]XIAO Z B,YANG Z,WANG L,et al.A lightweight Ti O2/graphene interlayer,applied as a highly effective polysulfide absorbent for fast,long-life lithium-sulfur batteries[J].Advanced Materials,2015,27(18):2891-2898.
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