Swelling Test and Analysis of Evolved Gas for Lithium Ion Secondary Battery



here is a demand for the lithium ion secondary battery to has a larger capacity and higher voltage. To meet the demand, deterioration gas will be evolved due to an increase in the load on the electrolyte. A container for use for this specific purpose has been developed and has made a high-sensitivity gas analysis of a sample obtained after a swelling test. The barrier discharge ionization detector (GC-BID) detects inorganic gases such as H2, CO and CO2 at a high sensitivity several tens times as high as that of GC-TCD and is capable of detecting organic gases having up to 3 carbons as well as inorganic gases at high sensitivity.

Swelling test


Example: Electrolyte: LiPF6
Solvent: Carbonate-based

Testing conditions (Example)

Fully charged 80°C x 2 days

GC-BID quantitative analysis

Gas inside the laminate was taken under conditions of being exposed to atmosphere and introduced directly to the apparatus.

The amount of evolved gas varied with individual batteries even though they had the same structure.

Qualitative analysis of trace components by GC-MS

  • An unknown component was detected by analysis by GC-BID.
  • The unknown component was qualitatively determined by GC-MS and it was identified to be fluoroethane.

Search Number 9037

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