Si-decorated graphene: a superior media for lithium-ions storage |
| |
Authors: | Narges Sharifi Mahdi Ardjmand Morteza Ghorbanzadeh Ahangari Masoud Darvish Ganji |
| |
Institution: | 1. Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran 2. Department of Mechanical Engineering, Semnan University, Semnan, Iran 3. Center of Nano-Science, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
|
| |
Abstract: | The characteristics of lithium adsorption on Si-decorated graphene are investigated using first-principles density functional theory calculations. It is found that the Si atom is strongly adsorbed at the bridge site of the C–C bond with binding energy of about ?26.75 kcal/mol. We show that Si decorating turns Si:graphene complex into an electron-deficient system and significantly enhances the Li-storage capacity on the graphene. The obtained results indicate that up to eight Li-ions being adsorbed onto the Si-decorated graphene can form the stable complex. It is found, interestingly, that two Si atoms coated onto double-side of the graphene can strongly adsorb sixteen Li-ions. The analyses of electronic structures show a strong interaction between Li-ions and Si-decorated graphene leading to a high exothermicity. The stability of the sixteen Li-ions adsorbed on the Si:graphene system was evaluated with ab initio molecular dynamics simulation which have been carried out at room temperature. Our first-principles results are relevant to identify the potential applications of Si-decorated graphene as superior media for Li-ions storage. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|