Degradation of the materials of construction in Li-ion batteries

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Description

The primary current-collector materials being used in lithium-ion cells are susceptible to environmental degradation: aluminum to pitting corrosion and copper to environmentally assisted cracking. Pitting occurs at the highly oxidizing potentials associated with the positive-electrode charge condition. However, the pitting mechanism is more complex than that typically observed in aqueous systems in that the pits are filled with a mixed metal/oxide product and exist as mounds or nodules on the surface. Electrochemical impedance spectroscopy was shown to be an effective analytical tool for quantifying and verifying aluminum corrosion behavior. Two fluorocarbon-based coatings were shown to improve the resistance of Al ... continued below

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30 p.

Creation Information

Braithwaite, J.W.; Gonzales, A. & Lucero, S.J. March 1, 1997.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The primary current-collector materials being used in lithium-ion cells are susceptible to environmental degradation: aluminum to pitting corrosion and copper to environmentally assisted cracking. Pitting occurs at the highly oxidizing potentials associated with the positive-electrode charge condition. However, the pitting mechanism is more complex than that typically observed in aqueous systems in that the pits are filled with a mixed metal/oxide product and exist as mounds or nodules on the surface. Electrochemical impedance spectroscopy was shown to be an effective analytical tool for quantifying and verifying aluminum corrosion behavior. Two fluorocarbon-based coatings were shown to improve the resistance of Al to pitting attack. Detailed x-ray photoelectron spectroscopy (XPS) surface analyses showed that there was very little difference in the films observed after simple immersion in either PC:DEC or EC:DMC electrolytes versus those following electrical cycling. Li and P are the predominant surface species. Finally, environmental cracking of copper can occur at or near the lithium potential and only if specific metallurgical conditions exist (work-hardening and large grain size).

Physical Description

30 p.

Notes

OSTI as DE97005178

Source

  • Other Information: PBD: Mar 1997

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  • Other: DE97005178
  • Report No.: SAND--97-0507
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/461265 | External Link
  • Office of Scientific & Technical Information Report Number: 461265
  • Archival Resource Key: ark:/67531/metadc681301

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Office of Scientific & Technical Information Technical Reports

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  • March 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • April 13, 2016, 1:21 p.m.

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Braithwaite, J.W.; Gonzales, A. & Lucero, S.J. Degradation of the materials of construction in Li-ion batteries, report, March 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc681301/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.