Lithium batteries are closely related to our lives and play an indispensable role. For example, our phones, laptops, household appliances, etc. that we never leave our hands on every day. The demand for lithium-ion batteries has also significantly increased in transportation vehicles such as airplanes, hybrid vehicles, and electric vehicles. In the manufacturing process of lithium-ion batteries, there are many things that must be strictly controlled, including dust, metal particles, and moisture.

2、 The impact of moisture on lithium batteries and market status

2.1 What adverse effects does moisture have on lithium-ion batteries?
The main manifestations are small battery capacity, shorter discharge time, increased internal resistance, decreased cycling capacity, battery expansion, etc. Therefore, in the production process of lithium-ion batteries, it is necessary to strictly control the humidity of the environment and the moisture content of the positive and negative electrode materials, separators, and electrolytes.

What is the current status of moisture control methods for lithium-ion batteries?
At present, the most commonly used technical methods for determining moisture content in the market are the heating weight loss method and the Karl Fischer method. Due to the extremely low moisture content of the samples measured in the lithium battery industry, the accuracy of the heating weight loss method moisture analyzer cannot be achieved, and this method is directly excluded.

IIIAnalysis and Methods

3.1 Instruments
AKF-BT2015C Lithium Battery Karl Fischer Moisture Analyzer

3.2 Technical Parameters and Characteristics

characteristic:
1. Karl Fischer headspace sample bottle heating technology effectively avoids contamination of the heating furnace and reaction cup;
2. The sample bottle connector created by Hegong allows the carrier gas to enter the interior of the sample bottle without piercing the sample bottle spacer, with good sealing and easy disassembly while reducing the use of spacer consumables;
3. With precise flow control design, the consumption of carrier gas is only one tenth of that of similar imported tubular heating furnaces;
4. High power heat dissipation groove design, quickly cooling sample bottles and improving work efficiency;
5.7 "high-resolution color touch screen interface, multi parameter display, intuitive and concise; one click measurement, extremely easy to operate;
6. The anti condensation insulation pipeline is designed without dead volume to ensure that there is no residual moisture in the pipe wall system after evaporation;
7. The heating temperature can reach up to 300 ° C, and the gas flow rate can be freely adjusted from 0-100ml to meet the moisture determination needs of most solid raw materials;
8. Fully automatic constant current polarization detection, no need for manual endpoint setting, high detection accuracy, moisture measurement resolution up to 0.1ug;
9. One click start, simple operation, stable and reliable, low failure, long service life;



3.3 Analysis principle
The sample is loaded into a sealed injection vial specifically designed for a Karl Fischer oven. After being sealed with a headspace bottle connector, it enters the heating tank. The moisture (which may also contain other volatile solvents) in the sample is completely released in the form of vapor. It is then transferred from the headspace bottle to a KF titration cup through a dry carrier gas (such as dry air or nitrogen) via a heating companion tube. The Karl Fischer moisture analyzer is used for detection and displays the measurement data.


3.4 Testing Methods

4Data and Conclusion

HOGON Karl Fischer Moisture Analyzer Sample Measurement Record

5、 Conclusion statement:
Through this experimental method, the moisture content of lithium-ion battery raw materials can be accurately measured, and the accuracy and repeatability of the detection results reach the level of similar imported products. The AKF Coulombic Karl Fischer Moisture Analyzer, combined with the KH-1 Karl Fischer Furnace Headspace Sample Injector, can automatically deduct drift, is easy to operate, and can accurately and reliably measure the moisture content of lithium batteries and raw materials.