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Corrosion of Aluminum Foil (99% Purity) in Lithium Ion Batteries with Lithium Hexafluorophosphate Electrolyte ()

Hemmati Saznaghi, Maryam | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56444 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad; Riyahifar, Reza; Raeesi, Babak
  7. Abstract:
  8. One of the problems that affects the lifetime and cycle life of lithium ion batteries is the localized corrosion of aluminum current collector (during the storage and charging cycle). Since applying corrosion-resistant coating has always been one of the ways to reduce corrosion of materials in different environments, in the present project, this method has been used to prevent corrosion of aluminum in lithium-ion batteries. For this purpose, the graphene oxide coating, which has desirable anti-corrosion properties, was coated on aluminum by Electrophoretic deposition and doctor blade methods. linear polarization, cyclic voltammetry and electrochemical impedance spectroscopy were performed to investigate the corrosion of aluminum with graphene oxide coating. FESEM images of these coatings have also been taken to evaluate the quality of coatings applied on aluminum. The results of polarization test showed that graphene oxide coating reduces aluminum corrosion in NaCl solution ( 3.5% wt) from 6.8 mpy in uncoated state to 0.96 mpy. Also, the results of cyclic voltammetry test that was conducted on the cathode half-cell showed that the graphene oxide coating reduces the localized corrosion current of aluminum in the battery environment from 0.37 μA to 0.28 μA while not disturbing the battery behavior. In addition, the impedance test results showed 50% increase in polarization resistance when using graphene oxide coating on aluminum foil in the battery environment. In fact, impedance test has shown that graphene oxide coatings prevent the corrosion of aluminum by barrier mechanism. To investigate the effect of graphene oxide coating on battery charge and discharge rate, charge and discharge test was performed on cathode samples with and without graphene oxide coating. The results of the mentioned test showed that despite the reduction of capacity from 180 mA / g to 150 mA / g in the initial cycles, the battery with graphene oxide coated has a relatively good capacity stability
  9. Keywords:
  10. Corrosion ; Aluminum ; Graphene Oxide ; Lithium Ion Batteries ; Lithium Hexafluorophosphate ; Lithium Foil

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