NaF-Si-C-RGO杂化材料的制备及电化学性能

发布时间：2018-01-22 22:56

本文关键词： 硅纳米颗粒 NaF-Si-C-RGO杂化材料无定形炭循环稳定性　出处：《新型炭材料》2017年04期 　论文类型：期刊论文

【摘要】：采用NaF溶液为添加剂,热固性酚醛树脂和还原氧化石墨烯(RGO)为碳源,制备了NaF-Si-C-RGO杂化材料。采用扫描电子显微镜、透射电子显微镜、热重分析仪、X射线衍射仪和拉曼分析仪等对其进行表征,并用作锂离子电池负极材料进行了相关电化学性能测试。NaF-Si-C-RGO杂化材料的循环稳定性和容量保持率均高于NaF-Si-RGO和Si-C-RGO杂化材料。因为硅纳米颗粒表面的无定形炭包覆层可以抑制SEI膜的不断形成;NaF中的Na+可以插入到氧化石墨烯片层中,不仅可以缓解氧化石墨烯片层的堆垛现象,还利于Si纳米颗粒在石墨烯片层中的分散,使更多的活性物发挥作用;F-的存在,一定程度抑制了电解液的分解,减少了HF的生成,这有利于维持电极结构的完整,从而保证了电极良好的循环稳定性。
[Abstract]:NaF-Si-C-RGO hybrid materials were prepared by using NaF solution as additive, thermosetting phenolic resin and reduced graphene oxide (RGO) as carbon source. Transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffractometer (XRD) and Raman analyzer (Raman) were used to characterize it. The cyclic stability and capacity retention of NaF-Si-C-RGO hybrid materials were higher than those of NaF-Si-RGO and Si-. C-RGO hybrid materials. The amorphous carbon coating on the surface of silicon nanoparticles can inhibit the continuous formation of SEI films. The Na in NaF can be inserted into graphene oxide, which can not only alleviate the stacking phenomenon of graphene oxide, but also facilitate the dispersion of Si nanoparticles in graphene oxide. Making more active substances work; The existence of F- inhibits the decomposition of electrolyte to a certain extent and reduces the formation of HF, which is conducive to maintaining the integrity of the electrode structure and ensuring the good cycling stability of the electrode.
【作者单位】：中国科学院大学;中国科学院山西煤炭化学研究所中科院炭材料重点实验室;
【基金】：山西省基金(2012011219-3) 中国科学院山西煤炭化学研究所杰出青年人才项目~~
【分类号】：TB332;TM912
【正文快照】： 2.中国科学院山西煤炭化学研究所,中科院炭材料重点实验室,山西太原030001)Foundation item:Natural Science Foundation of Shanxi Province(2012011219-3);Outstanding Young Talent Fund of Institute ofCoal chemistry,Chinese Academy of Sciences.Corresponding author:

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