Evidence of Transition-Metal Accumulation on Aged Graphite Anodes by SIMS

  • Abraham D
  • Spila T
  • Furczon M
 et al. 
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In cells containing Li1.05?Ni1/3Co1/3Mn1/3?0.95O2-based positive and graphite-based negative electrodes, a significant portion of cell impedance rise on aging is known to be from the negative electrode. One possible reason for this impedance rise is the dissolution of transition-metal elements from the oxide electrode that accumulate and create a high-impedance layer at the negative electrode– electrolyte interface. This article details dynamic secondary ion mass spectrometry ?SIMS? measurements, which provide a relative comparison of Mn, Co, and Ni contents on fresh, formed, and aged graphite electrodes. The data clearly indicate that these transition-metal elements accumulate at the electrode surface and diffuse into the electrode during cell aging. © 2008 The Electrochemical Society

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  • D. P. Abraham

  • T. Spila

  • M. M. Furczon

  • E. Sammann

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