GB/T 45324-2025 Determination of powder resistivity for cathode materials of lithium ion battery
1 Scope
This document describes the methods for determining the powder resistivity for cathode materials of lithium ion battery using both the four probe method and the two probe method.
This document is applicable to the determination of powder resistivity for cathode materials of lithium ion battery.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
resistivity
ρ
ratio of the electric field intensity to the steady-state current density within the material, which represents the volume resistance per unit volume
[Source: GB/T 40007-2021, 3.2]
3.2
four probe method
method for determining the resistivity of a pre-compacted powder specimen under varying or constant compaction densities using a four-probe resistivity tester, where the compaction density changes dynamically due to continuous pressure application or remains static under maintained pressure
[Source: GB/T 40007-2021, 3.3, modified]
4 Principles
4.1 Four probe method test principle
As shown in Figure 1, the cathode powder material is filled into an insulated specimen mold lined with insulation, and the upper surface of the mold specimen shall be in close contact with four probes arranged in a straight line. The four probes shall be pressed vertically onto the upper surface of the specimen. Current is passed between the outer probes 1 and 4, while a voltage circuit is formed between the inner probes 2 and 3. When the specimen thickness h is greater than 4l, the resistivity ρ is calculated using Equation (1); when the specimen thickness h is less than or equal to 4l, the resistivity ρ is calculated using Equation (2).
Foreword I 1 Scope 2 Normative references 3 Terms and definitions 4 Principles 5 Reagents and materials 6 Instruments and equipment 7 Test specimens 8 Test conditions 9 Test steps 10 Test data processing 11 Precision 12 Test report Bibliography
GB/T 45324-2025 Determination of powder resistivity for cathode materials of lithium ion battery
1 Scope
This document describes the methods for determining the powder resistivity for cathode materials of lithium ion battery using both the four probe method and the two probe method.
This document is applicable to the determination of powder resistivity for cathode materials of lithium ion battery.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
resistivity
ρ
ratio of the electric field intensity to the steady-state current density within the material, which represents the volume resistance per unit volume
[Source: GB/T 40007-2021, 3.2]
3.2
four probe method
method for determining the resistivity of a pre-compacted powder specimen under varying or constant compaction densities using a four-probe resistivity tester, where the compaction density changes dynamically due to continuous pressure application or remains static under maintained pressure
[Source: GB/T 40007-2021, 3.3, modified]
4 Principles
4.1 Four probe method test principle
As shown in Figure 1, the cathode powder material is filled into an insulated specimen mold lined with insulation, and the upper surface of the mold specimen shall be in close contact with four probes arranged in a straight line. The four probes shall be pressed vertically onto the upper surface of the specimen. Current is passed between the outer probes 1 and 4, while a voltage circuit is formed between the inner probes 2 and 3. When the specimen thickness h is greater than 4l, the resistivity ρ is calculated using Equation (1); when the specimen thickness h is less than or equal to 4l, the resistivity ρ is calculated using Equation (2).
Contents of GB/T 45324-2025
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Principles
5 Reagents and materials
6 Instruments and equipment
7 Test specimens
8 Test conditions
9 Test steps
10 Test data processing
11 Precision
12 Test report
Bibliography
