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A test device and a test method for ion conductivity in electronic conductors

A technology of ion conductivity and testing equipment, which is applied in the direction of measuring equipment, measuring resistance/reactance/impedance, measuring electrical variables, etc., can solve the problem of inability to separate electronic conductivity, etc., and achieve the effect of wide application range and accurate testing method

Active Publication Date: 2017-07-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiency that the electronic conductivity cannot be separated in the existing ionic conductivity testing technology, the present invention designs and prepares a two-electrode testing device using an ion conductor without electronic conductivity function as the test current collector, which effectively separates the electron conductivity in the electrode material. It is suitable for testing the ionic conductivity in electronic conductors including carbon materials, metal materials, semiconductor materials and homogeneous, porous, etc.

Method used

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  • A test device and a test method for ion conductivity in electronic conductors
  • A test device and a test method for ion conductivity in electronic conductors
  • A test device and a test method for ion conductivity in electronic conductors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Cut the Nafion117 film into 2×2cm and place it in the sample tank, and test its AC impedance spectrum at different temperatures according to the above method, as shown in figure 2 shown. Record the intersection point value of the real axis of the impedance spectrum: Z 1-50 =0.166Ω, Z 1-60 =0.0.151Ω, Z 1-70 =0.127Ω, Z 1-80 =0.117Ω, Z 1-90 =0.099Ω. Its surface conductivity is calculated according to the above formula, such as image 3 As shown, compared with the results measured by the four-probe method (Comparative Example 1) and the literature results, it has good accuracy.

Embodiment 2

[0040] Embodiment 2: Cut the untreated Toray carbon paper into 2 × 2cm and place it in the sample tank, and test its AC impedance spectrum at different temperatures according to the above method, as shown in Figure 4 shown. Record the intersection point value of the real axis of the impedance spectrum: Z 2-50 =0.253Ω, Z 2-60 =0.0.238Ω, Z 2-70 =0.219Ω, Z 2-80 =0.206Ω, Z 2-90 =0.199Ω. Its surface conductivity is calculated according to the above formula, such as Image 6 shown.

Embodiment 3

[0041] Example 3: Cut the Toray carbon paper impregnated with 30% mass fraction of Nafion solution into 2×2cm and place it in the sample tank, and test its AC impedance spectrum at different temperatures according to the above method, as Figure 5 shown. Record the intersection point value of the real axis of the impedance spectrum: Z 3-50 =0.261Ω,Z 3-60 =0.213Ω,Z 3-70 =0.167Ω, Z 3-80 =0.122Ω, Z 3-90 =0.083Ω. Its surface conductivity is calculated according to the above formula, such as Image 6 shown. Compared with Example 2, after impregnated with Nafion solution, the ionic conductivity of carbon paper is greatly improved, and the combination of objective experimental rules proves the reliability of this test method.

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Abstract

A test device, comprising two plate-shaped pole plates arranged opposite to each other, two Nafion membranes are arranged between the two pole plates, carbon paper or carbon cloth is arranged between the pole plates and the Nafion membrane; the two pole plates are passed through wires Connect with electrochemical workstation or resistivity tester respectively. The present invention makes up for the gaps in the prior art, and realizes the effective separation of electronic conductivity and ion conductivity in electrodes and other electronic conductors. The test method is accurate, efficient, and widely applicable. The test materials include carbon materials, metal materials, and semiconductors. Materials and homogeneous, porous and other electronic conductors.

Description

technical field [0001] The invention relates to a test device, in particular to a test method for ion conductivity in electronic conductors. Background technique [0002] The ion conduction efficiency in the electrode is closely related to the performance, life and cost of new energy technologies such as fuel cells, metal-air batteries, and lithium-ion batteries. It is one of the determinants of the electrode reaction rate and interface establishment. Therefore, the efficient detection of ionic conductivity is a key technology for the preparation of electrode materials and structures. Different from the ionic conductivity test method of polymer materials such as ordinary Nafion membranes, electrode materials have both electronic conductance and ionic conductance, and the two are difficult to separate, so metals such as platinum wire cannot be used as current collectors for testing. Finding a method that can efficiently separate and measure electronic and ionic conductance i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
Inventor 孙公权夏章讯王素力姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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