Electrochemical dilatometer for the measurement of height changes in aqueous electrolytes with nanometer resolution

Discover the new ECD-4-nano, the highly improved successor of the ECD-3 series!

  • Highly improved cycling stability due to redesigned sealing concept
  • Capacitive displacement sensor (range 250 μm, resolution ≤ 5 nm)
  • Additional gas pressure (0 to 3 bar) and temperature sensor (-20 to 80° C)
  • Cableless connection via PAT socket, with electronic cell tag (PAT-Button)
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Watch your electrodes breathing

The ECD-3-nano-aqu is the dilatometer with a displacement resolution in the nanometer range specialized for the use in aqueous electrolytes. Its capacitive parallel-plate sensor system can obtain displacement signals of below 5 nanometers. This high resolution makes it possible to explore new territory of electrochemical dilatometry. For instance, quasi 2-dimensional electrode processes like the SEI formation in lithium-ion batteries or the electrochemically driven growth of passivation layers on metal surfaces might become the subject of future dilatometric studies.

The heart of the ECD-3-nano-aqu is an electrochemical cell, which is hermetically tight against ambient atmosphere.  The two electrodes inside are separated by a stiff glass frit that is fixed in position. The upper (working) electrode is sealed by means of a thin metal membrane through which any charge-induced height change is transmitted towards the sensor/load unit above. The cell components in media contact are made of gold and PEEK.

ECD-3-nano overview

Height 230 mm
Width 100 mm
Depth 110 mm
Weight 2.7 kg
Separator diameter 12 mm
Working (upper) electrode diameter 10 mm
Counter (lower) electrode diameter 12 mm
Displacement sensor system capacitive
Displacement range 250 μm
Displacement resolution better than 5 nm
Test specimen Electrode films
Load on test specimen approx. 1 N
Chemical compatibility Aqueous electrolytes
Cell electrolyte volume approx. 0.5 ml
Temperature resistance -20 to +70 °C (Cell and Sensor)
0 to +40 °C (Conditioning electronics and data logger)

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