How to test lithium battery electrolyte?

How to detect lithium battery electrolyte 1. Appearance: Observe the color of the electrolyte. Generally, the electrolyte is a colorless and transparent liquid. There are also special national standards that have specific methods for appearance detection. The standard is GB/T9282.1-2008 transparent. The color of the liquid is evaluated according to the platinum-cobalt grade. The first part is to configure a platinum-cobalt standard solution, and use a spectrophotometer to measure its absorbance and transmittance under different wavelength ranges of incident light, and then configure a series of standard colorimetric solutions. Add the specified volume of the original solution to the 100ml colorimetric tube, dilute to the mark with water and shake it, then seal it, and mark the corresponding cobalt-platinum unit number on the colorimetric tube, and then compare the sample to be tested with the standard sample. can. 2. Chroma: Color is represented by both brightness and chroma. Chroma is the property of color excluding brightness. It reflects the hue and saturation of the color. The standard is also GB/T3143 liquid chemical products. Color measurement method Platinum-cobalt color number, the test method is similar to the appearance test method, and the result is also obtained through spectrophotometer measurement and comparison with standard samples. 3. Density: generally adopt GB/T2540 petroleum product density determination method pycnometer method for measurement. Choose a suitable pycnometer according to the sample, put the liquid to be tested into the pycnometer and heat it in a constant temperature bath. When the surface of the liquid is not changing, absorb the excess water with filter paper, wipe off the sample above the marking line, and wipe the exterior. Weigh, and then use the formula to calculate. 4. Conductivity: It is a very important physical parameter that describes the difficulty of the charge flow in a substance, which determines the power performance of the battery. Generally, it can be measured with a conductivity meter. 5. Determination of sulfate ions: In hydrochloric acid medium, barium ions and sulfate ions generate insoluble barium sulfate. When the content of sulfate ions is low, barium sulfate becomes a suspension within a certain period of time, making the solution turbid. The turbidity of the solution and the standard comparison solution was judged by visual method to obtain the measurement result. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: What are the correct charging methods for batteries?