Surface Coating Constraint Induced Anisotropic Swelling of Silicon in Si–Void@SiO
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Nanowire Anode for Lithium‐Ion Batteries |
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| Authors: | Qian Liu Zhe Cui Rujia Zou Jianhua Zhang Kaibing Xu Junqing Hu |
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| Affiliation: | 1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, China;2. Department of Physics, Donghua University, Shanghai, China |
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| Abstract: | Here a simple and an environmentally friendly approach is developed for the fabrication of Si–void@SiOx nanowires of a high‐capacity Li‐ion anode material. The outer surface of the robust SiOx backbone and the inside void structure in Si–void@SiOx nanowires appropriately suppress the volume expansion and lead to anisotropic swelling morphologies of Si nanowires during lithiation/delithiation, which is first demonstrated by the in situ lithiation process. Remarkably, the Si–void@SiOx nanowire electrode exhibits excellent overall lithium‐storage performance, including high specific capacity, high rate property, and excellent cycling stability. A reversible capacity of 1981 mAh g?1 is obtained in the fourth cycle, and the capacity is maintained at 2197 mAh g?1 after 200 cycles at a current density of 0.5 C. The outstanding overall properties of the Si–void@SiOx nanowire composite make it a promising anode material of lithium‐ion batteries for the power‐intensive energy storage applications. |
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| Keywords: | anisotropic swelling anodes cycling stability Si– void@SiOx nanowires surface coating constraint lithium‐ion batteries |
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