کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6465181 | 1422951 | 2017 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Tailored silicon hollow spheres with Micrococcus for Li ion battery electrodes Tailored silicon hollow spheres with Micrococcus for Li ion battery electrodes](/preview/png/6465181.png)
- Porous Si hollow spheres were synthesized using Micrococcus bacteria templates.
- Excellent Li diffusion coefficient can be provided by carbon coating of Si spheres.
- Carbon coated Si spheres exhibited superior cycle stability for Li ion batteries.
The porous Si hollow spheres (p-Si HSs), which feature interconnected Si nanostructures decorated with spherical-type Micrococcus bacteria, were synthesized by a combination of magnesiothermic reduction and byproduct removal and were subsequently studied as an anode material for lithium-ion batteries (LIBs). The p-Si HSs offer a high lithium-ion storage capacity because of their numerous active sites and large electrolyte contact area stemming from their large specific surface area (â¼313.7Â m2Â gâ1); in addition, their large pore volume (â¼0.927Â cm3Â gâ1) buffers large volume changes during the lithiation/delithiation processes, which is important for improving the cycle stability of anode materials. Furthermore, carbon coating resulted in the formation of a stable solid electrolyte interface through minimization of the Si/electrolyte contact area and also offered an efficient electronic conduction pathway, corresponding with improved lithium reactivity of the active Si materials. The lithium-ion diffusion coefficient of the non-clogging carbon-coated p-Si HSs was approximately five times greater than that of the p-Si HSs. As a result, the designed composite nanostructured electrodes demonstrated excellent cycle stability and superior rate capability.
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Journal: Chemical Engineering Journal - Volume 327, 1 November 2017, Pages 297-306