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首页> 外文期刊>Advanced Functional Materials >Stable SiOC/Sn Nanocomposite Anodes for Lithium-Ion Batteries with Outstanding Cycling Stability
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Stable SiOC/Sn Nanocomposite Anodes for Lithium-Ion Batteries with Outstanding Cycling Stability

机译：具有出色循环稳定性的锂离子电池稳定的SiOC / Sn纳米复合阳极

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摘要

Silicon oxycarbide/tin nanocomposites (SiOC/Sn) are prepared by chemical modification of polysilsesquioxane Wacker-Belsil PMS MK (SiOC_(MK)) and polysiloxane Polyramic RD-684a (SiOC_(RD)) with tin(ll)acetate and subsequent pyrolysis at 1000 ℃. The obtained samples consist of an amorphous SiOC matrix and in-situ formed metallic Sn precipitates. Calvanostatic cycling of both composites demonstrate a first cycle reversible capacity of 566 mAhg~(-1) for SiOC_(MK)/Sn and 651 mAhg~(-1) for SiOC_(RD)/Sn. The superior cycling stability and rate capability of SiOC_(RD)/Sn as compared to SiOC_(MK)/Sn is attributed to the soft, carbon-rich SiOC matrix derived from the RD-684a polymer, which accommodates the Sn-related volume changes during Li-uptake and release. The poor cycling stability found for SiOC_(MK)/Sn relates to mechanical failure of the rather stiff and fragile, carbon-poor matrix produced from PMS MK. Incremental capacity measurements outline different final Li-Sn alloy stages, depending on the matrix. For SiOC_(RD)/Sn, alloying up to Li_7Sn_2 is registered, whereas for SiOC_(MK)/Sn Li_(22)Sn_5 stoichiometry is reached. The suppression of Li_(22)Sn_5 phase in SiOC_(RD)/Sn is rationalized by an expansion restriction of the matrix and thus prevention of a higher Li content in the alloy. For SiOC_(MK)/ Sn on the contrary, the matrix severely ruptures, providing an unlimited free volume for expansion and thus formation of Li_(22)Sn_5 phase.
机译：碳氧化硅/锡纳米复合材料（SiOC / Sn）是通过对聚倍半硅氧烷Wacker-Belsil PMS MK（SiOC_（MK））和聚硅氧烷Polyramic RD-684a（SiOC_（RD））与乙酸锡（II）进行化学修饰并随后在60℃下热解制备的1000℃。获得的样品由非晶SiOC基质和原位形成的金属锡沉淀组成。两种复合材料的恒电循环表明，对于SiOC_（MK）/ Sn，第一循环可逆容量为566 mAhg〜（-1），对于SiOC_（RD）/ Sn，为651 mAhg〜（-1）。与SiOC_（MK）/ Sn相比，SiOC_（RD）/ Sn的循环稳定性和倍率性能更高，这归因于源自RD-684a聚合物的柔软，富碳的SiOC基体，它可以适应Sn相关的体积变化在摄取和释放锂期间。 SiOC_（MK）/ Sn的较差的循环稳定性与PMS MK产生的相当僵硬，易碎的碳贫乏基质的机械故障有关。增量容量测量概述了不同的最终锂锡合金阶段，具体取决于基体。对于SiOC_（RD）/ Sn，合金化最多记录到Li_7Sn_2，而对于SiOC_（MK）/ Sn，达到Li_（22）Sn_5化学计量比。通过基体的膨胀限制合理地抑制SiOC_（RD）/ Sn中的Li_（22）Sn_5相，从而防止合金中较高的Li含量。相反，对于SiOC_（MK）/ Sn，基体严重破裂，提供了无限的自由体积用于膨胀并因此形成Li_（22）Sn_5相。

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  • 来源
    《Advanced Functional Materials》 |2014年第26期|4097-4104|共8页
  • 作者

    Jan Kaspar; Caglar Terzioglu; Emanuel lonescu; Magdalena Graczyk-Zajac; Stefania Ha pis; Hans-Joachim Kleebe; Ralf Riedel;

  • 作者单位

    Institut fuer Materialwissenschaft Technische Universitaet Darmstadt Jovanka Bontschits Strasse 2, 64287 Darmstadt;

    Institut fuer Materialwissenschaft Technische Universitaet Darmstadt Jovanka Bontschits Strasse 2, 64287 Darmstadt;

    Institut fuer Materialwissenschaft Technische Universitaet Darmstadt Jovanka Bontschits Strasse 2, 64287 Darmstadt;

    Institut fuer Materialwissenschaft Technische Universitaet Darmstadt Jovanka Bontschits Strasse 2, 64287 Darmstadt;

    Institut fuer Angewandte Geowissenschaften Technische Universitaet Darmstadt Schnittspahnstrasse 9, 64287 Darmstadt;

    Institut fuer Angewandte Geowissenschaften Technische Universitaet Darmstadt Schnittspahnstrasse 9, 64287 Darmstadt;

    Institut fuer Materialwissenschaft Technische Universitaet Darmstadt Jovanka Bontschits Strasse 2, 64287 Darmstadt;

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