Lithium Ion Secondary Batteries
Degradation Analysis of Lithium Ion Secondary Batteries

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Summary

Lithium ion batteries suffer degradation such as a decline in the battery capacity and an increase in the resistance of the positive and negative electrodes. The causes of such decline in the battery capacity and such increase in resistance can be studied in degradation analysis. This can be done by identifying the materials used and investigating the composition and morphological change of the materials, an increase in product materials having changed in quality and a change in chemical state of Li and Co before and after degradation.

Example of analysis: Gas chromatography analysis of the electrolyte before and after storage test

  • As a result of analyzing the electrolyte by gas chromatography, it was confirmed that there was a decrease in the amounts of the electrolyte and the additives after storage test.
  • The very small peak was analyzed by GC/MS, and it was assumed that it was fluorophosphonic acid diethyl ester.

Carbonates: Absolute calibration curve; trace components: determination by EC conversion

Example of analysis: SEM observation and XPS analysis of electrode surface before and after storage test

  • As a result of performing SEM observation of the negative electrode surface before and after storage test, it was confirmed that there was an increase in deposits.
  • XPS analysis revealed that there were a drop in LiPF6 ratio and an increase in phosphate (LiPFxOy, P2O5, etc.).

Binding Energy(eV)    Binding Energy(eV)

Search Number 9021

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