The dilatometer does only measure the displacement (=change in thickness), but not the total thickness. The initial displacement reading is arbitrary and can be changed by just turning the micrometer screw at the sensor head. In practice, you turn the micrometer screw so that the initial reading is in the range of zero +/- 20 µm. After the measurement, for convenience, you substract some offset value, so as to set the displacement value exactly to zero at that point in time, where you have started the electrochemical cycle.
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Testing materials for lithium-ion batteries A battery is a can with two terminals named plus and minus, or 1 and 2. Testing this battery means that you apply either a voltage (V12) profile or a current (i12) profile across the two terminals, and measure the corresponding current or voltage response. The profile can have many different shapes such as square, triangle, sine, or some arbitrary profile. This concept applies to small and large battery cells as well as to arrays of such battery cells connected in series and/or in parallel (battery modules or packs). One could therefore think that... read more →
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This application note is supposed to be the first in a series dealing with the electrochemical testing of materials for lithium-ion batteries (LiB) using the PAT system from EL-CELL. More precisely, we will show you the advantages of the PAT-Cell (compared to other test cells like button, Swagelok and pouch cells) and the PAT battery testers (compared to other high-end battery cyclers, impedance analyzers and electrochemical workstations). For that purpose, we are going to look into typical test cases from the battery lab: full cells made up of NCM and graphite as the two electrodes, or so-called half cells comprised... read more →
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Testing of Battery Materials with Mesh-type Reference Electrodes A long time ago, we advertised to use a finger-type (aka wire-type) reference electrode. Everything we wrote still holds. However, the bad news is that the finger-type reference electrode is no longer available. The good news is that we now have an even better solution: The mesh-type reference electrode. The new mesh-type reference comes in two variants: fine and coarse. Both have the same web width of 50 µm and web thickness of 25 µm but different mesh sizes (see pictures below). You will get the mesh ready assembled into our standard... read more →