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      저자 : Jeanine Pichler-Nagl (검색결과 1 건)
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        Preparation of silicon nanoball encapsulated with graphene shell by CVD and electroless plating process

        김희진,황태연,강근원,Jeanine Pichler-Nagl,소대섭,박성진,허훈 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.50 No.-

        Carbon materials such as graphite have been widely used as the anode materials of secondary batteries. Inspite of good stability, they are limited by low capacity. Silicon has a 4 times higher capacity than anyother carbon material. But it cannot be used, because it has a low stability caused by the volume expansion. In this study, we fabricated a silicon nanoball encapsulated with graphene (Si-GB) to overcome thementioned problems. In order to form a core/shell structured graphene encapsulated silicon nanoball,nickel was coated on the surface of a silicon nanoball by electroless plating method. Then, a graphene layerwas synthesized on the surface of the nickel shell by a CVD process. We were able to make a Si-GB byetching the nickel layer. The Si-GBs were formed with a spherical void between the silicon particle and thegraphene layer, by which it has a better safety against to volumetric change of anode during lithiation/delitiation of repeated charging–discharging in secondary batteries. Morphology of the grapheneencapsulated silicon nanoball was observed by thefield emission scanning electron microscope (FESEM)and thefield emission transmission electron microscope (FETEM) tofind core–shell structured nanoball. Spherical structure of graphene encapsulated silicon nanoball was investigated by the Raman, the X-rayPhotoelectron Spectroscopy to identify graphene layer on the surface of the inner silicon core. The charge–discharge performance of the Li-ion battery using Si-GB was investigated by the battery cycler system.

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