Method for testing electrical conductivity of powdered material

A powder material and electrical conductivity technology, which is applied in the field of testing material properties, can solve the problems of complex data calculation and high operator requirements, and achieve the effects of simple test operation, simple test data processing and low cost.

Active Publication Date: 2010-03-31
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have high requirements for operators, and the collection of raw data requires a lot of expensive precision testing equipment, and the data calculation is complex and complicated.

Method used

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  • Method for testing electrical conductivity of powdered material
  • Method for testing electrical conductivity of powdered material
  • Method for testing electrical conductivity of powdered material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a. Pressed disc

[0033] Two equal weights of dry lithium manganate powder were sieved through a 200-mesh sieve, and pre-compressed at 1 MPa in a tablet press (Tianjin Keqi, 769YP-40C powder tablet press). Sprinkle copper powder on both sides of one molded sheet through a 200-mesh screen, and sprinkle titanium disulfide powder on both sides of the other molded sheet through a 200-mesh screen, then pressurize to 5 MPa and maintain for 10 minutes to form the disc. Carry out vacuum packaging on a vacuum packaging machine, place the packaged wafers in an isostatic pressing mold, pressurize to 200MPa, and keep for 10 minutes to completely compact the wafers, and finally make the density of the pressed wafers close to that of lithium manganate material the true density of .

[0034] Test the thickness D of the disc, and the radius r of the disc, and calculate the area S of the disc.

[0035] b. DC shunt test

[0036] Connect the wafers coated with copper powder on both sid...

Embodiment 2

[0044] The test method is the same as that of Example 1, the difference is that only the powder material is replaced by lithium cobalt oxide, and the metal powder on both sides of the disk is replaced by silver powder, and the electronic conductivity of the lithium cobalt oxide powder material is finally calculated by testing. The ratio, ionic conductivity and diffusion coefficient are listed in Table 1.

Embodiment 3

[0046] The test method is the same as in Example 1, the difference is that only the powder material is replaced with graphite, and the electronic conductivity, ion conductivity and diffusion coefficient of the lithium cobalt oxide powder material are finally calculated in Table 1.

[0047] Table 1 embodiment test result

[0048] Powder material

[0049] From the test results in table 1, it can be seen that the electronic conductivity, ion conductivity and diffusion coefficient of different powder materials can be tested quickly, simply and easily by adopting the method of the present invention, and then provide research personnel with the powder material Further research on application provides a strong basis.

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Abstract

The invention provides a method for testing electrical conductivity of powdered material, comprising the following steps: the powdered material is laminated to be platy, and then metal powder is pressed and covered at two sides of the platy powder material, an electronic resistance is tested by a direct-current shunting method, and the electronic conductivity of the powered material is calculatedaccording to the electrical conductivity formula that rho is equal to D/ReS; the electrical conductivity of metal powder is more than 1*10<0>S/cm, wherein the rho is the electronic conductivity, D issheeting thickness, Re is electronic resistance and S is sheeting area. The method provided by the invention can further test the ionic conductivity of the powdered material and calculate the diffusion coefficient of the powdered material. The method for testing electrical conductivity of powdered material has simple testing process and is easy to know, and the cost is low and the test result is accurate.

Description

technical field [0001] The invention relates to a method for testing material properties, in particular to a method for testing the conductivity of powder materials. Background technique [0002] Performance evaluation of powder materials is an indispensable and important link in the application process of powder materials, and electrical conductivity is an important performance parameter of most powder materials, such as semiconductor fields, positive and negative electrode powders of lithium batteries, etc. These powder materials Conductivity directly affects the performance of subsequent products, so its testing method is also critical. [0003] The current method for testing electronic conductivity is mainly the four-probe method, but there is no simple and easy test method for ion conductivity. There are many methods to test the diffusion coefficient, such as current intermittent titration (GITT), potentiometric intermittent titration (PITT), volumetric intermittent ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
Inventor 陆卫忠陈国营钱春秀
Owner SHANGHAI BYD
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