Moisture has a crucial impact on the performance of lithium batteries, including their capacity, lifespan, and safety performance. Moisture can promote the production of hydrofluoric acid (HF) from lithium hexafluorophosphate (LiPF6) in the electrolyte, affecting membrane quality and thus impacting the cycling and safety performance of the battery; Secondly, moisture will react with lithium batteries on the negative electrode surface to generate lithium oxide (Li2O) and release gas, consuming lithium ions, increasing the internal pressure of the battery, reducing battery capacity, and affecting the safety performance of the battery. Therefore, how to control the water content during the generation process of lithium batteries is the most important focus for battery manufacturers.

The measurement of electrolyte moisture usually adopts the Karl Fischer direct injection test method. Due to the high hygroscopicity of the electrolyte and the requirement for extremely low moisture content, it is recommended to operate in a dry glove box during electrolyte sampling and use an electrolyte rinse syringe before injection.

For materials such as positive electrodes, negative electrodes, and separators, they often exist in solid or semi-solid form, and moisture measurement is generally carried out using a card furnace+card coulombic method. The use of a card furnace method for sample moisture measurement usually requires heating the sample to a certain temperature and carrying the evaporated moisture to a Coulombic titration cell through an external dry carrier gas. This measurement method will introduce bias to the results of low moisture content.

The ECH fully automatic Karl Fischer moisture meter without external carrier gas does not require an external carrier gas. It pumps the moisture of the sample into the Coulombic titration cell through internal gas circulation, saving a lot of gas drying time and more accurate measurement results. At the same time, it also avoids methanol evaporating from the Karl Fischer reagent and contaminating the laboratory air.

The heating temperature of the card furnace is a very important parameter for determining the moisture content of the sample. The correct heating temperature needs to be able to release all the water from the sample and ensure that no thermally induced chemical reactions occur. The ECH fully automatic Karl Fischer moisture meter without external carrier gas has a built-in gradient heating program, which can help R&D find the optimal heating temperature for different products.

The ECH fully automatic Karl Fischer moisture meter without external carrier gas is suitable for testing various battery materials and has higher testing accuracy. The programmable heating program helps product development. The ECH fully automatic Karl Fischer moisture meter without external carrier gas is a better choice for measuring the moisture content of lithium batteries.