Page 15 - Guide to Lithium-ion Battery Solutions

Thermal Analysis

Evaluation of shrinkage amount when the separator is heated
Moisture evaluation during heating of electrode active material

Thermomechanical Analyzer

Thermogravimetric Analyzers TMA-60

TGA-50 series • It is possible to measure the amount of shrinkage and shrinkage stress at each
temperature
• A small amount of water content can be detected • Continuous recording of a sample's dimensional changes as temperature
• Evaluation of connectivity by measuring the dehydration process changes or over time in the order of µm
temperature • Tensile measurement, expansion measurement, and needle insertion
• Measurement is possible in the atmosphere of air or nitrogen measurement are possible with one unit

It is important to control the moisture content in lithium-ion batteries because it affects their lifetime. The moisture In general, the higher the shrinkage temperature and the smaller the amount of shrinkage, the safer it is. Thermo-
content of a material can be measured using a thermogravimetric analyzer (TGA). mechanical analysis (TMA) was used to measure mainly the shrinkage of the separator.

Purpose Samples Purpose Samples

Measurement of moisture content in the Positive/Negative electrode active material Measure the shrinkage of the separator The two directions of the separator
active material called the MD (machine direction) and TD
(transverse direction)
Data Data

TGA Measurement of Electrode Active Materials TMA Measurement of Separators

Result Result

A weight loss rate at 200 °C was determined, and the moisture content was 0.033% and 0.214%, respectively. According to the data, the start of shrinkage begins approximately between 80 °C and 100°C. In terms of the amount of
shrinkage, the amount of shrinkage is larger in the MD direction than in the TD direction for both No. 1 and 2 .

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