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Synthesis and Simulation of Silicon-based Anodes Hybridized with Graphene Sheets in Lithium-ion Batteries

Habibipour, Mohammad Reza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58101 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Esfandiar, Ali
  7. Abstract:
  8. Lithium-ion batteries are one of the most important and popular batteries on the market due to their long cycle life and their popularity is daily increasing. These batteries have many applications in our daily lives, including mobile phones and laptops, and it can be claimed that with the advent of electric cars, we can see a lot of progress in this area. Silicon is one of the most promising anode materials for lithium-ion batteries due to its high theoretical capacity and abundance in the earth's crust. Unfortunately, significant disproportionate volume changes during the entry / exit of lithium ions in continuous charge-discharge processes lead to serious damage to the structure, so the specific capacity decreases and the battery impedance increases. To overcome the rapid capacity decline, significant achievements have been made in the development of nanostructures and surface coating approaches in terms of improving structural stability and achieving cyclic stability. Graphene, due to its special electrical and mechanical properties, has always attracted special attention for creating nanocomposites with different materials. In this study, the effect of adding graphene and in particular reduced graphene oxide to silicon anode is investigated and simulated. Addition of graphene on the one hand, due to its special mechanical properties, causes better stress tolerance and better mechanical stress distribution for the stability of silicon, and on the other hand, the growth of the solid layer of the electrolyte interface will be formed on it stably. In addition to the reported graphene structures, this study presents a highly optimal structure based on porous graphene that displays a capacity above 1849 mAh / g at a current density of 2 A/ g. In addition, the confirmation of this material choice has been checked with the help of computer simulation of the structure, for a better phenomenology study of the operation mechanism
  9. Keywords:
  10. Lithium Ion Batteries ; Graphene ; Silicon Anodes Cyclic Behavior ; Simulation ; Nanomaterials ; Silicon Anode

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