Mass spectrometer can accurately quantify the amount of gas consumed and generated during the reaction process of lithium-ion batteries. By combining the amount of electricity Q passed through the battery reaction, the reversible main reaction and irreversible side reaction of lithium-ion batteries can be studied; When side reactions occur in lithium-ion batteries, they are usually accompanied by the production of gases such as H2, CO, CO2, etc. Therefore, measuring the type and content of gases, combined with electricity calculation and isotope tracking, can further clarify the changes in positive electrode materials during the operation of lithium-ion batteries.

The mass spectrometer and DEMS system mainly consist of three parts: carrier gas transport regulation system, electrochemical reaction device, and mass spectrometer. The carrier gas first enters the trap from the gas cylinder to eliminate the interference of impurity gases on the experiment, and then enters the flow controller. The gas generated in the lithium-ion battery reaction device enters the sampling capillary injection component after passing through the cold trap, and then enters the online mass spectrometer after being heated and kept at a constant temperature. The electron bombardment type ion source (EI) can generate electrons of certain energy and ionize the compound to be detected into molecular ion fragments and fragment ions in the ionization chamber. The required ions are screened by a mass analyzer and arrive at the detector in sequence according to the mass to charge ratio. The signal is amplified and recorded to obtain a gas change trend chart.

Advantages of mass spectrometer products:

The capture trap can eliminate the interference of impurity gases (such as H2O and CO2) on the experiment;

Forming a spiral gradient gas flow field above the battery makes the airflow more stable, greatly reducing the probability of vortex occurrence and improving gas transmission efficiency;

Customers can set the flow rate of the flow controller according to different experimental systems;

Cold traps and Teflon membranes can remove organic electrolytes from the sample gas, ensuring the accuracy of data;

Using high-precision capillary injection components to ensure gas consistency;

The filament is made of thorium iridium wire, which has strong resistance to water and oxidation, and can withstand long-term continuous injection of sample gas, maintaining long-term stability;

Mass spectrometry software provides both ion flow and concentration data for easy selection and viewing.