Preparation and electrochemical properties of core-shell Si/SiO nanocomposite as anode material for lithium ion batteries |
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Institution: | 1. Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka, 563-8577, Japan;2. Fundamental Technology Research Center, Honda R&D Co., Ltd., 1-4-1 Chuo, Wako-shi, Saitama, 351-0193, Japan;3. Department of Greenergy, National University of Tainan (NUTN), Tainan 70005, Taiwan |
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Abstract: | The Si/SiO nanocomposite was synthesized by a sol–gel method in combination with a following heat-treatment process. It was analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), cyclic voltammetry (CV) and capacity measurement as anode material for lithium ion battery. Si nanoparticles were coated with SiO and a core-shell structured nanocomposite was formed. The core-shell Si/SiO nanocomposite displays better reversibility of lithium insertion/extraction and higher coulomb efficiency than virginal Si nanoparticles. The SiO shell envelops the Si nanoparticles to suppress the aggregation of the nanoparticles during cycling. As a result, the core-shell Si/SiO nanocomposite exhibits better capacity retention than virginal Si nanoparticles, indicating that this is a promising approach to improve the electrochemical performance of nano anode materials for lithium ion battery. |
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