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Study of Silicon Active Particles Yield Condition under Lithiation in Li-Ion Battery

Delgosha, Reza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57118 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Aryanpour, Masoud
  7. Abstract:
  8. Low capacity of the batteries is one of the main limitations of using them in different industries and transportation applications. For example, in fully-electrical cars, battery capacity determines the distance that could be proceeded without recharging. Although, it’s possible to increase capacity by increasing battery volume; but in cases that volume or mass is a limitation itself, this is not a practical solution. In fact, what should be considered as the real limitation is the density of capacity of batteries. The improvement in battery capacity means storing more Lithium-Ion in the anode of battery. Silicon has always been noticed as a high capacity material for using in anode. In comparison to a common anode like graphite it has 10 time more capacity. For this reason, it can improve battery capacity, significantly. The problem of using silicon as an active material of anode, is its pulverization under lithiation. Hence, disconnection between a part of anode active particles and current collector causea a decrese in battery capacity. In this thesis, after estimating mechanical charactristics of silicon under lithiation, stress-strain behaviour of LMO and Silicon has been studied utilizing numerical and analytical methods and a comparison among them has been carried out. In this work, the emphasis is on providing an analytical soluton for calculating stress distribution in silicon active particle with elastic-plastic behavior under Lithiation. The results of this thesis have applications in silicon anodes of Li-Ion batteries and can be considered as the base of designing more effective silicon anodes. Also, the employed method to analyze the fracture caused by ion diffusion could be utilized in similar problems
  9. Keywords:
  10. Lithium Ion Batteries ; Diffusion ; Concentration ; Stress Distribution ; Silicon ; Stress-Strain Behavior ; Self-Propelled Particles

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