Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5447782 | Materials Chemistry and Physics | 2017 | 9 Pages |
Abstract
With the aim to stabilize the structure of Si then improve the lithium storage performance, in this study a facile way is applied to deposit a layer of nitrogen-doped-carbon (NDC) on porous Si surface by carbonizing melamine, and the porous Si is easily prepared by etching SiAl alloy with HCl solution. After NDC coating, the cycling performance has been improved from 585.3 mAh gâ1 for pure porous Si in the 100th cycle at 200 mA gâ1 to 1496 mAh gâ1 for Si/NDC composite, and the rate capability is also enhanced from 47.1 mAh gâ1 for pure porous Si at 3200 mA gâ1 to 499.6 mAh gâ1 for Si/NDC composite. TEM images show the coating layer helps to stabilize the porous structure of Si during cycling. XPS analysis indicate Si has chemically acted with N and C during the calcination step, and the theoretical calculation based on density function theory indicates these chemical interactions benefit for the electron transferring between Si and the coating layer of NDC, thus enhancing the rate capability.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Xiaosong Zhang, Mengyi Huang, Chaofan Yang, Guoliang Dai, Junjie Huang,