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Corrosion issues in Lithium-ion batteries

Corrosion issues in Lithium-ion batteries. Presenter: Shengyi Li Advisor: Ben Church. Background introduction. Lithium ion batteries (LIB) are attractive for its combination of energy and power density.

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Corrosion issues in Lithium-ion batteries

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  1. Corrosion issues in Lithium-ion batteries Presenter: ShengyiLi Advisor: Ben Church

  2. Background introduction • Lithium ion batteries (LIB) are attractive for its combination of energy and power density. • LIB slurries could be classified into organic-solvent based and water based system. and the water-based system has attracted increasing attention due to environmental and cost considerations LIB automotive coating line

  3. Corrosion Formation • In most cases pitting initiate from Al-Fe second phase particles. Al Corrosion Product Layer Fe EDS analysis, Al-Fe Intermetallics found at center of many early-stage corrosion pits Localized corrosion pit Intermetallic is cathodic to aluminum, creates localized galvanic cell

  4. Conclusion • pH plays important role in influencing aluminum corrosion behavior in alkaline solutions. This is further proved by the polarization curves. • The localized corrosion starts with pitting forming around Al-Fe, aluminum matrix around the Fe-Al particles are activated and destroyed by growth of cracks. The break down of the oxide layer around the second phase particles makes the matrix contacting with hydroxide easily corroded so the pit continuously grows. • Based on the analysis of calculated phase diagrams, the intermetallic particles are expected to occur in all grades of commercial-pure aluminum currently available. Removal of the intermetallic by increasing the purity level of the aluminum is theoretically possible, but the commercial impacts would likely preclude this as a viable solution.

  5. Reference • [1]Jeffrey W. Braithwaite,etc.Journal of The Electrochemical Society, 146 (2) 448-456 (1999) • [2] Chia-Chen Li, etc. Journal of Power Sources 109 (2002) 458–464 • [3] Tzipi Cohen Hyams, Journal of The Electrochemical Society, 154 8 C390-C396 2007 • [4] Seung-TaekMyung, Journal of Materials Chemistry, 2011, 21, 9891

  6. Thanks for your attention!

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