Lithium Ion Secondary Battery
Surface Analysis of Negative Electrode Material by TOF-SIMS

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Summary

A lithium ion secondary battery negative electrode material readily undergoes a change in its chemical bonds due to the air. However, if a sample of the material is properly treated in an argon atmosphere, it will become possible to evaluate any changes in the surface of the sample itself such as a quality change in the negative electrode that has occurred during charging and discharging tests by means of time-of-flight secondary ion mass spectrometry (TOF-SIMS).

Example of analysis

Surface analysis of the negative electrode material of a charged lithium ion battery (main component: carbon)

  • A battery was disassembled in a glove box in an argon atmosphere, and the electrode was washed in a solvent and used as a specimen.
  • This was put into a transfer vessel, and it became possible to introduce the specimen into TOF-SIMS equipment with the specimen in a state of being exposed to the air.

Ion image
(The brighter the image was, the more ions were detected.)
Image of positive secondary ions Image of negative secondary ions

Fragments coming from lithium carbonate, phosphate, etc. were detected from the negative electrode surface as a result of TOF-SIMS. It is presumed that these derived from the degradation of the electrolyte. The imaging carried out by use of positive and negative ions made it possible to compare the abnormal area and its surrounding area.

Search Number 4033

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