Hioki RM2610 - 8 Faq

91
8
FAQ
Q.
About the reduction factor (p. 94)
A.
The reduction factor is a parameter for adjusting the magnitude of the correction applied
during iterative calculation of interface resistance. Use of a small value results in a more stable
convergence process but incurs longer calculation times.
Q.
How is interface resistance calculated? (p. 95)
A.
By combining multipoint potential measurement (resistance measurement) and inverse analysis
calculations, it is possible to isolate and calculate the composite layer volume resistivity and
interface resistance for lithium-ion battery electrode sheets.
Q.
What is the nite volume model? (p. 97)
A.
The nite volume model signies a calculation domain that has been segregated into a nite
number of elements (known as a mesh) in order to perform numerical calculations using the
nite volume method (FVM).
Q.
What kind of electrode sheets can be measured?
A.
Electrode sheet requirements*
Electrode sheets must:
• Have a conductive composite layer.
• Have a surface that lacks an insulating coating (for the measurement probes to contact).
• Have a rm composite layer (if the composite layer is too soft, the measurement probes will
stick into the composite layer, resulting in unstable potential readings).
• Have a composite layer that is not too thin (guideline: composite layer thickness of 20 μm or
greater).
• Have a composite layer that is not too thick (guideline: composite layer thickness of 100 μm or
less).
• Have an interface resistance that is not too high.
• Have an interface resistance that is not too low.
*Whether a given electrode sheet can be measured depends on the balance of composite
layer thickness, composite resistance, and interface resistance. The above information is not
intended to provide a guarantee that any given electrode sheet can be measured.
Q.
Can electrode sheets coated on both sides be measured? (p. 98)
A.
It makes no difference whether the electrode sheet being measured is coated on one side or
both sides.
Q.
What is volume resistivity? (p. 99)
A.
Volume resistivity is a physical property that indicates the comparative difculty with which
electricity passes through a material. It is also known as resistivity, specic resistance, and
electrical resistivity. Volume resistivity is measured in [
Ω
m].
Q.
What is surface resistivity? How do composite layer volume resistivity and
composite layer surface resistivity differ? (p. 100)
A.
Surface resistivity indicates the difculty with which electricity ows perpendicular to a surface
that has no thickness or that is thin enough that its thickness can be ignored. The property is
converted to a unit area and measured in [
Ω
m
2
]. The value is unique and does not depend on
the sheet’s area.
8 FAQ
8
FAQ