Device and method for testing electrical conductivity of slurry

A technology of conductivity and slurry, which is applied in the field of electrochemistry, can solve the problems of four-probe inability to test the resistivity of slurry materials and repeatedly replace probes, so as to save materials, improve work efficiency, and improve accuracy.

Inactive Publication Date: 2018-11-06
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems existing in the prior art, the present invention provides a device and method for testing the conductivity of slurry. The present invention avoids the problem that the traditional four probes cannot directly test the resistivity of the slurry material and repeatedly replace the probes, and realizes direct Rapid Test for Paste Conductive Materials

Method used

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  • Device and method for testing electrical conductivity of slurry
  • Device and method for testing electrical conductivity of slurry
  • Device and method for testing electrical conductivity of slurry

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] 1. Preparation of conductive paste: use the step-by-step method to prepare conductive pastes with different solid contents, and the specific ratios are shown in Table 1:

[0045] Table 1

[0046]

Embodiment 1

[0048] Will figure 1Open the upper cover 13 of the container, add conventional conductive agent dry powder in the sealed container 12, add the dispersant in the sealed container 12, and add the solvent into the sealed container 12 through the funnel 1 and the DN15 rubber tube 2 (the cross-sectional area of ​​the rubber tube is 0.0177 square decimeters, the flow rate 0.1dm / s, that is, adding 10.62g of solvent deionized water per minute, 13.65min, 5% solid slurry solvent can be added to the sealed container), cover the upper cover, put it on the magnetic stirrer 5, and turn on the magnetic force Stirrer 5, rotating speed 1500rpm / s, stirring rotor 4 promptly stirs the material in the container, stirs for 4h until the slurry is dispersed and mixed evenly, then the stirring can be ended, and the vacuum pump 14 is connected to vacuumize for 20min to remove the air bubbles in the slurry, 5 The preparation of the conductive paste under the % solid content is completed; the solid-conta...

Embodiment 2

[0050] Since the special conductive paste does not know how much to add to achieve the effect of 2% of the conventional conductive paste, it is prepared according to the proportion of Example 1 from high solid content to low solid content to obtain special conductive paste.

[0051] 2. Slurry Conductivity Test

[0052] Combine (1) the slurry that just fills the entire container figure 1 Connect the test device to the test system shown, turn on the DC resistance tester 9, insert the two wires 10 of the DC resistance tester 9 into the double U-shaped contact points, and make the wires smoothly connected to the conductive set under the action of the spring force. At the corresponding concave point of the fluid 11, and the contact is more sufficient, the infrared temperature measuring and controlling instrument 8 is used to test the change of the resistance value of the conductive paste at 25 ± 2 °C in the same time at 5 parallel points with different solid contents. The formula ...

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Abstract

The invention discloses a device and a method for testing electrical conductivity of slurry. The device comprises a sealed container with an upper cover, a magnetic stirrer placed outside the bottom of the sealed container, a stirring rotor placed in the sealed container, a micro vacuuming pump communicating with the sealed container, two conductive current collectors placed in the bottom of the sealed container, a direct current resistance testing instrument electrically connected with the two conductive current collectors, an infrared temperature measuring and controlling instrument for detecting the internal temperature of the sealed container, and a material feeding mechanism and a discharge mechanism which are in communication with the sealed container. By adopting the device providedby the invention, a resistance test can be conducted directly on the slurry, so as to judge the dispersibility and the conductivity; at the same time, the method can also be directly configured to the conductive slurry with different solid content, and stirring in large mixing equipment is not needed, so that materials are saved; the influence of the slurry with same solid content on the electrical conductivity at different time and at different temperatures can be clearly seen in data, the stability of the slurry can be judged, the accuracy of the conductivity evaluation of the slurry can beenhanced, and the work efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a device and method for testing the conductivity of slurry. The testing device and method of the invention are mainly used in the evaluation of the conductivity of lithium-ion battery slurry. Background technique [0002] In the existing lithium battery, the test of the conductivity of the slurry mainly tests the resistivity, which is one of the important parameters reflecting the conductivity of the material. There are many methods for measuring resistivity, and the four-probe method is a widely used standard method. Its advantages are simple equipment, convenient operation, high precision, and no strict requirements on the shape of the sample. [0003] The most commonly used is the straight four-probe. The needle tips of the four probes are on the same straight line, and the spacing is equal, all are S, and the spacing of 0.5mm is generally used. Different probe spac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/06
CPCG01N27/06
Inventor 杨万光任永刚王建彬
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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