多壁纳米碳管约束二硫化锡作为锂离子电池负极的电化学行为

发布时间：2018-03-19 11:16

本文选题：锂离子电池　切入点：多壁纳米碳管　出处：《物理化学学报》2017年06期 　论文类型：期刊论文

【摘要】：通过两步法制备多壁纳米碳管约束SnS_2纳米材料(SnS_2@MWCNT)。采用直流电弧等离子体法在甲烷气氛下制备多壁纳米碳管约束金属锡纳米结构(Sn@MWCNT)作为前驱体,再通过硫化反应获得SnS_2@MWCNT纳米结构。对材料进行Raman、X射线衍射(XRD)、透射电镜(TEM)等物理表征的结果显示多壁纳米碳管长约400nm,表面碳层晶化程度良好,碳层厚度约10 nm。以Sn S2@MWCNT纳米结构作为负极材料的锂离子电池显示出较为良好的电化学性能。其首次充放电库伦效率为71%,循环50次后,容量仍保持703 mAh?g~(-1)。SnS_2@MWCNT纳米结构电极的高容量特性源于多种活性物质共同提供容量,且各物质反应平台不同。平台呈现明显阶梯型,缓解了体积膨胀效应对电极材料的破坏。
[Abstract]:The multi-walled carbon nanotubes (MCNTs) constrained SnS_2 nanomaterials (SnSS-2MWCNT) were prepared by two-step method. The multi-walled carbon nanotubes (MWCNTs) were prepared by DC arc plasma method in methane atmosphere. The SnS_2@MWCNT nanostructures were obtained by vulcanization reaction. The results of physical characterization of the materials showed that the length of the multi-walled carbon nanotubes was about 400nm, and the surface carbon layer was well crystallized. The carbon layer thickness is about 10 nm. The lithium ion battery with SnS2MWCNT nanostructure as anode material shows good electrochemical performance. Its first charge / discharge Coulomb efficiency is 71 and the capacity remains 703 mAhh after 50 cycles. The high capacity of the electrode is attributed to the capacity provided by a variety of active substances and the different reaction platforms. The platform is obviously ladder type, which alleviates the damage of the electrode material due to the volume expansion effect.
【作者单位】：大连理工大学材料科学与工程学院三束材料改性教育部重点实验室;华盛顿大学材料科学与工程学院;
【基金】：国家科学自然基金(51171033) 常州工业支撑计划(CE20160022) 常州企业领军型创新人才引进培育项目(CQ20153002) 中央高校基本科研业务费重点实验室专项经费(DUT16LAB03,DUT15LAB05)资助~~
【分类号】：TB383.1;TM912

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