Lithium battery moisture control is a top priority in the production process. Heye Technology has served nearly a hundred customers in the lithium battery related field for many years. Our engineers have summarized some of the problems encountered by customers in the moisture detection process in recent years, hoping to be helpful to all customers Lithium battery electrode moisture detection: 1. Dry the sample bottle. Before sampling, the sample bottle must be dried at a temperature of 120-160 ℃ for 3-6 hours. When taken out, the bottle cap must be immediately closed and sealed for storage. The blank moisture content of the sample bottle should be less than 10ug, which is ideal, and the smaller the better. 2. Sampling environment: The sampling environment must be carried out in an environment with a dew point. It is generally recommended that the dew point be less than -40 ℃, and 1-2 empty sample bottles should be placed with the lid open for blank testing. 3. Sample cutting: The pole pieces can generally be cut into small pieces of 0.5cm, or cut into a strip along the height of the sample bottle. After being placed in the sample bottle, it can be dispersed and attached to the bottle wall for a circle, which is more suitable. 4. The injection amount is generally recommended to not be less than 0.5g. If the injection amount is too small, it is easy to cause injection errors, or the positive electrode may have deviations when the moisture content is very low. 5. Weighing tools: It is generally recommended to use a 1/10000 electronic balance, with a minimum of 1/1000 balance to reduce injection errors. Before testing the sample, it is generally possible to test the blank moisture content of 1-2 empty bottles as the blank value and fill it in the "Blank Deduction" section of the testing options. Before formally testing the sample, it should be ensured that the current drift is below 0.5ug/s and there is no obvious upward or downward trend. 8. After completing a sample, remove the bottle with the sample from the Cassegrain heating furnace and reinsert it into the drift bottle, allowing the instrument to stabilize again before making the next sample. 9. Selection of temperature for the Karl Fischer heating furnace: The moisture testing process of lithium-ion battery materials and positive and negative electrode plates was analyzed and tested using the Karl Fischer moisture tester gradient temperature rise method. Research shows that baking positive and negative electrode plates containing NMP at higher temperatures will cause a large amount of residual NMP to evaporate and enter the testing system, leading to side reactions. Therefore, the moisture content testing temperature should not exceed 170, ℃; Aqueous electrode sheets containing CMC will undergo carbonization when baked at higher temperatures, releasing water into the testing system, resulting in a higher water content test value. Therefore, the maximum temperature for testing its water content is 150, ℃; Due to the relatively simple composition of the positive and negative electrode powder, the baking temperature for testing the water content is relatively wide, ranging from 110 to 270 ℃

Lithium battery electrolyte water detection: 1. Reagent selection: Reagent selection is very important, as complex electrolyte components often add many additives that can produce side reactions with Karl Fischer reagents, resulting in high measured water content or often not reaching the endpoint, Our company's C16 lithium battery electrolyte specific reagent is generally recommended for the detection of complex electrolyte components. It can handle the moisture detection of the vast majority of electrolytes, with good testing results and high cost-effectiveness. 2. Sampling and sample container: The sampling container must be dry and waterless, and the sampling must not come into contact with conventional air, otherwise the electrolyte can easily absorb moisture, causing measurement errors. 3. Injection volume: It is generally recommended to inject around 1ml. If there are side reactions in the sample, the injection volume can be appropriately reduced to reduce the side reactions