SJ/T 11792-2022 English PDF (SJT11792-2022)

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SJ/T 11792-2022: Test method for conductivity of electrode materials used in lithium ion battery
SJ/T 11792-2022
SJ
ELECTRONIC INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 31.030
CCS L 90
Test method for conductivity of electrode materials used in
lithium ion battery
ISSUED ON: APRIL 24, 2022
IMPLEMENTED ON: JULY 01, 2022
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Method principles ... 4
5 Interference factors ... 5
6 Instruments and equipment ... 5
7 Measurement methods ... 6
8 Test report ... 7
Test method for conductivity of electrode materials used in
lithium ion battery
1 Scope
This document describes a test method for the electronic conductivity (conductivity) of
electrode active materials in lithium-ion batteries.
This document applies to lithium nickel cobalt manganate, lithium nickel cobalt
aluminate, lithium iron phosphate, lithium cobalt oxide, lithium manganate, lithium
nickel oxide, lithium nickel manganate, lithium nickel cobalt oxide, lithium-rich
manganese base, lithium titanate and other electrode active materials for lithium-ion
batteries. The conductivity test of other electrode active materials can also make
reference to this standard.
2 Normative references
This document has no normative references.
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Active substance
The actual substance in the electrode material that supplies and stores lithium ions.
4 Method principles
Fully squeeze the powdered electrode active material in the cylindrical sample cavity,
to form good contact between the micro-particles. Apply a voltage to both ends of the
tightly squeezed sample, to obtain the resistance value R according to Ohm's law.
Finally, according to the conductivity formula σ = L(RS) (where σ is the conductivity
of the sample, S is the cross-sectional area of the sample in the sample cavity, L is the
thickness of the sample in the sample cavity), calculate the conductivity of the sample.
5 Interference factors
The following interference factors shall be noted when measuring:
a) The degree of contact between the electrode and the sample and the particles of
the sample itself has a significant impact on the conductive properties. The
pressure exerted on the sample shall be a specific value.
b) Measuring temperature and humidity will affect the resistivity of the material.
Care shall be taken to keep the temperature and humidity of the measurement
environment and specimen within a specific range.
c) The matching problem between the diameter of the upper and lower electrodes of
the test device and the inner diameter of the sample cavity will lead to varying
degrees of powder leakage, which will have an impact on the measured thickness
and calculated resistivity. The diameter of the upper and lower electrodes shall
closely match the inner diameter of the sample cavity.
6 Instruments and equipment
6.1 Conductivity tester. It is equipped with a tablet pressing device; the maximum
pressure intensity is not less than 160 MPa; the pressure accuracy is better than 1 MPa.
The tablet pressing device can directly measure the thickness of the sample in the
sample cavity. The measurement accuracy is not less than 10 μm. The upper and lower
push rods of tablet pressing devices are connected to the resistance tester, as upper and
lower electrodes, respectively. The resistance measurement range is 1 μΩ ~ 1200 MΩ.
The resistance measurement accuracy is better than 0.1%RD + 0.1%FS. The
conductivity measurement range is 10-9 S/cm ~ 106 S/cm. The sample cavity is made of
insulating materials, to prevent the test current from being conducted through the
sample cavity and causing measurement errors. The push rod and sample cavity are
both made of wear-resistant materials. The structural diagram of the conductivity tester
is as shown in Figure 1.