Measure ionic resistance (aka SOP)

Note

This standard operating procedure (SOP) also exists in video form

Prepare the workstation

Warning

When handling electrolyte always wear goggles and work in a well ventilated space.

Checklist : Gloves, googles, ethanol, wipe, FIPT cell, brush, tweezer, cutting tool, pipette, pipette tips and your electrode.

  • Clean the workstation with ethanol.
  • Clean the pipette, the tweezer with dry wipe.
  • Set the pipette to 300ul and place the pipette tip.
  • Clean all parts of the FIPT cell with the brush to remove any contamination of past measurement .
  • Clean the cutting tool with the brush. Mind the blades!
  • Check age of electrolyte.
  • Check FIPT cell is complete: support, base, top and clamp.
  • Check screw clutch setting is 0.4Nm
_images/1.png

Prepare separators

If you have no separator pieces left, cut them in the following way:

  • Cut the circular separator material (up to 3 at a time) with the triangle ruler and yellow cutting tool into 21mm wide stripes.
  • Cut the stripes into smaller pieces (21mm × 35mm).
  • Throw out stripes with exessive wrinkling or contamination.
_images/fipt_cut_separator.jpg

Label FIPT cell

  • Clean the label on the cell wih ethanol.
  • Write the new label of the electrode and precise the side that you want to measure.
_images/2.png

Cut the electrode

Checklist : Cutting tool, tweezer and your electrode labeled.

  • Place the electrode on the cutting tool.
  • Press the blades down to cut out the electrode strip.
  • Collect the electrode strip with the tweezer.
  • Check the edges of the strip are clean after cutting. The electrode strip should be 20mm wide.
  • Repeat the cutting for two strips total.

Note

Keep track of which side of the electrode you want to measure!

_images/3.png

Assemble the FIPT cell

Checklist : FIPT cell, tweezer, pipette, separator, electrolyte and 2 strips of electrode.

Warning

All orientation markers of the FIPT cell should point to top-left.

  • Place the first strip orthogonal to the foam of the FIPT cell. Face up the side that you want to measure.
  • Place one separator on the middle of the electrode strip in the FIPT cell gap.
  • Check that separators sits stable in the center.
_images/4.png
  • Apply 300ul of electrolyte to the center of the separator.
_images/5.png
  • Place the second strip on the top of the separator, orthogonal to the first strip. Face down the side that you want to measure.
_images/6.png
  • Close the cell by adding the top.
  • Check that the orientation markers are aligned.
_images/7.png
  • Mount the top clamp.
  • Screw in the middle screw until the clutch of screw triggers (you will hear a click sound).
_images/9.png

Run the measurement

  • Attach 2 measurement wires to the strips of the electrode to connect the FIPT cell to an impedance analyzer.
_images/10.png
  • Set up the measurement.
_images/11.png
  • Carry out the FIPT measurement and determine the ionic resistance of your electrode.
  • Note that a good graph looks like a hockey stick.
_images/12.png

Note

To achieve reliable data, do a total of 3 measurements per sample

Analyze your data

A typical data set looks like this:

_images/fipt_test_data_003.csv.fit.plot.png

To see how to analyze your FIPT data using our fipt-analysis , watch our follow up video on our website