Lithium Ion Secondary Batteries
Analysis of the Separator

Print

High-density PE is cited as an example of the raw material for the separator, and there are a variety of products developed, including multi-component types, heat-resistant types, and types having the function of preventing thermal runaway. We analyzed the separators used in commercially available batteries and perform a detailed analysis.

Cross-sectional SEM observation

  • Cryo ion milling processing makes it possible to prepare a cross section of even a separator not resistant to heat without damage while retaining the original shape.
  • An enlarged view made a clear observation of the inside possible.
  • It was found that the separator was of a 2-layer structure.
  • As a result of element analysis (EDX), Al and O were detected from Layer III.

FT-IR

Melting point measurement by DSC

  • From FT-IR and DSC measurement, it is presumed that the primary polymer component of the separator was HDPE and contained a small amount of homo PP.
  • The other inorganic material detected by FT-IR is assumed from the database and the results of the element analysis to be alumina (heat-resistant insulation layer). The ester component is presumed to be the binder resin for alumina.

Search Number 9023

Download The Technical Note of This Exapmle.

Contact Us

Inquiries Through Our Website