Test method for macroscopic intensity of conductive material and application

A conductive material, macroscopic technology, applied in the direction of applying stable tension/pressure to test material strength, material analysis and strength characteristics through electromagnetic means, can solve the problems of positive electrode material macroscopic particle strength evaluation, etc., to prevent large battery capacity The effect of reducing, short evaluation cycle, and stable results

Active Publication Date: 2019-11-05
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no evaluation of the strength of the macroscopic particles of the cathode material in the performance evaluation of the cathode material of lithium batteries, so it is urgent to study a method to predict the particle strength of the cathode material

Method used

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  • Test method for macroscopic intensity of conductive material and application
  • Test method for macroscopic intensity of conductive material and application
  • Test method for macroscopic intensity of conductive material and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Divide the positive electrode material A into 4 groups, among which 3 groups were pressed for 1 minute under the pressure of 4 tons, 6 tons and 8 tons respectively, and the amount of single powder pressing was 5g / time.

[0060] (2) Grind the three groups of positive electrode materials A after powder compaction and pass through a 400-mesh sieve, and at the same time pass a group of positive electrode materials A without powder compaction through a 400-mesh mesh sieve; test the 4 groups of positive electrode materials after sieving The resistivity of A under four different pressures of 4kN, 8kN, 12kN, and 16kN. When testing the resistivity, the amount of positive electrode material A is 4g / time.

[0061] (3) Summarize the resistivity and calculate the change rate of material resistivity after compaction under different test pressures. The calculation results are shown in Table 1 and figure 2 .

[0062] According to the experimental results in Table 1, the change in...

Embodiment 2

[0071] (1) Divide the positive electrode material B into two groups, and one group is pressed for 1 minute under a pressure of 8 tons, and the amount of single pressed powder is 5g / time. (2) Grind the powdered cathode material B and pass it through a 400-mesh sieve, and at the same time pass a group of positive electrode materials A without powder compaction through a 400-mesh sieve; Resistivity under four different pressures of 4kN, 8kN, 12kN, and 16kN, among which, the amount of positive electrode material B used when testing resistivity is 4g / time. (3) Summarize the resistivity and calculate the change rate of material resistivity after compaction under different test pressures. The results are shown in Figure 4 .

Embodiment 3

[0073] (1) Divide the positive electrode material C into 2 groups, one of which is subjected to tamping under 8 tons of pressure for 1 minute, and the single tamping amount is 5g / time. (2) Grind the powdered positive electrode material C and pass it through a 400-mesh sieve, and pass a group of positive electrode materials A without powder compaction through a 400-mesh screen; test the sieved two groups of positive electrode materials C respectively in Resistivity under four different pressures of 4kN, 8kN, 12kN, and 16kN, among which, the amount of positive electrode material C used when testing resistivity is 4g / time. (3) Summarize the resistivity and calculate the change rate of material resistivity after compaction under different test pressures. The results are shown in Figure 5 .

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Abstract

The invention provides a test method for the macroscopic intensity of a conductive material and application. The method comprises that (1) the conductive material is pressed into powder; (2) the resistivity of the conductive material before and after powder pressing is tested at different pressures; and (3) the resistivity and resistivity change rate of the conductive material before and after powder pressing at the different pressures are analyzed to determine the microscopic intensity of the conductive material. The method is simple in operation, short in evaluation period and stable in result, and can be used evaluate the particle macroscopic intensity of the conductive material, evaluate the stability of batch of supply materials, determine whether the conductive material is powdered in the using process, and compare the macroscopic intensity of different conductive materials, and the method can be widely applied to the battery field.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method and application for testing the macroscopic strength of conductive materials. Background technique [0002] At present, portable electronic products have a trend of miniaturization and light weight, and the necessity of high performance and large capacity of the power supply is increasing day by day. The battery generates electrical energy through the electrochemical reaction between the positive electrode and the negative electrode. The most representative lithium secondary battery is a lithium secondary battery that generates electrical energy due to changes in the chemical potential of lithium ions in the positive and negative electrodes when intercalated and deintercalated. The positive and negative electrodes of the lithium secondary battery use materials that can reversibly intercalate and deintercalate lithium ions. Among the positive and negative electr...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N3/08G01N27/04
CPCG01N3/08G01N27/043G01N27/041G01N2203/0019G01N2203/0087G01N2203/0298G01N2203/0617
Inventor孙明珠吴鹏磊
OwnerSVOLT ENERGY TECHNOLOGY CO LTD