Electrochemical dilatometer for the measurement of height changes in aqueous electrolytes with nanometer resolution
Watch your electrodes breathing
The ECD-3-aqu is a research grade instrument dedicated to the measurement of charge-induced strain (expansion and shrinkage) of electrodes down to the sub-micrometer range. The ECD-3-aqu is particularly developed for the investigation of Li-ion battery and other insertion-type electrodes. It is specialized for the use with aqueous electrolyte solutions.
The ECD-3-aqu is the result of more than 10 years experience in this field. The heart of the ECD-3-aqu is an electrochemical cell, which is hermetically tight against ambient atmosphere. The two electrodes inside are separated by a stiff glass frit, which is fixed in position. The upper (working) electrode is sealed through a thin metal membrane, which transmits any charge-induced height change to the sensor/load unit on the top.
A high-resolution displacement transducer detects dimensional changes ranging from a few up to 500 micrometers during an experiments, which can take between a few seconds and many days. A simple weight serves to adjust the load on the working electrode. The potential of the working electrode can either be controlled against the counter electrode (cell voltage control) or against an additional reference electrode. The cell components in media contact are made of gold and PEEK.