Analysis of Structures of a Battery and Capacitor
Analysis of Moisture Content in the Electrode
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Measurement of the moisture content in the electrode of a lithium-ion battery is conducted without exposure to atmosphere.
Necessity of Measurement of Moisture Content in a Lithium-Ion Battery
- In a lithium-ion battery, its deterioration is accelerated by the presence of moisture in the battery. Therefore, the identification of moisture content is one of the important items in considering the extension of the battery life.
Collection of a Sample for Moisture Content Measurement
- The processes from disassembly of the lithium-ion battery to collection of an electrode sample in question are performed in a glove box under an atmosphere replaced with argon.
-
Glove box for sampling
(argon atmosphere) -
Taking out the electrode
and finely cutting it -
Cell for transporting
the moisture sample
Measurement Using a Trace Moisture Measurement System
- A glove bag is attached to the sample feeding port of a trace moisture measurement system, and a sample is fed into the system under an atmosphere replaced with argon to conduct measurement.
-
Trace moisture measurement system
Karl Fischer method (coulometric titration method) -
Position where a glove bag is attached
(a glove bag is to be attached at a place
enclosed in the red broken line)
- The lower detection limit is 1 µg* for H2O.
* Note that the lower detection limit for the content varies with the amount of the collected sample.
