Battery Internal Resistance Tester Machine For Cell Slurry Resistivity Testing
 

SPECIFICATIONS
 

 

The Significance of Slurry Resistivity
The slurry is an important intermediate product in the production of lithium-ion batteries. The uniformity and stability of the slurry greatly affect the consistency and electrochemical performance of the final battery cell. The current method of monitoring slurry only has viscosity parameters, which cannot accurately evalu- ate the uniformity and stability of its electrical proper- ties. However, the slurry conductivity parameters and slurry formulation, conductive agent type and content,
binder type andcontent etc, which all have significant correlation to monitor the production of slurry, and the slurry may have gel sedimentation after dwelling for a period of time after mixing. At this time, the conductivity value will also show varying degrees of change. Therefore, the conductivity of the slurry can be used as a method to characterize the uniformity and stability of the electrical properties of the slurry.
Monitoring the conductivity of the slurry, on the one hand, it can evaluate the influence of different active materials, conductive agents, binders, solid content, etc. on the electrochemical perfor- mance, for material evaluation and screening, on the other hand, it can also be used for process stability monitoring, which can quickly identify abnormalities in the mixing process, and avoid the waste of time and cost caused by defective products flowing into the subsequent process.

Slurry Resistivity Test Principle
Test steps: Putting a certain volume of slurry (~80mL) into the measuring glass, inserting a clean electrode pen, start the software, start to test the changes in the slurry resistivity at the three pairs of electrodes over time and save it in the file.
Test parameters: Resistivity, Temperature, Time
Calculation formula: Resistivity (Ω*cm):ρe=U/I*S/l

Character:
1. Separate the voltage and current lines, eliminate the influence of inductance on voltage measurement, and improve the accuracy of resistivity detection;
2. The disk electrode with a diameter of 10mm ensures a relatively large contact area with the sample and reduces the test error;
3. Real-time monitoring of changes in resistivity of the slurry at three positions in the vertical direction over time;
 

4.Gel sedimentation evaluations:Comparing different types of conductive agent

After slurry-A was allowed to stand, in the morning test on the third day, the resistivity of the lower channel electrode had been significantly lower than that of the middle channel and the upper channel, indicating that the slurry had settled, and most of the particles settled to the bottom of the cup. The electrical conductivity becomes better and the resistivity decreases;
After three days of standing for slurry B, the resistivity hardly changed, indicating that there was no obvious settlement;
A standing period can be set for the slurry resistivity of a certain fixed type of conductive agent to ensure the uniformity of the slurry!