Three Electrode Battery Test Cell – compression controlled
This cell is designed as high-quality alternative to Swagelok-type constructions for reproducible electrochemical measurements of battery and supercapacitor materials. The cell consists of two main elements: (i) the cell base with micrometer screw and compression wave spring, which allows precise control of pressure applied to the electrode sandwich; and (ii) electrode cartridge where the anode, cathode and reference electrode are located. The (default) electrode cartridge and plungers are designed for planar electrodes with diameter of 18 mm and total sandwich thickness up to 2 mm (an option for thicker electrode stacks is available on request). The diameter of separator shall be 22 mm. The lock ring secures the separator in the electrode cartridge allowing easy and safe electrodes insertion, while ensuring accurate alignment. The upper and lower electrode plungers are available in various materials: 316L/317L Stainless Steel (default), copper, aluminum, nickel, gold plated nickel, etc. The punch-type refence electrode is installed from the side of the electrode cartridge. Thanks to sharp edge of the punch the reference electrode (Li/Na/K, etc.) can be easily cut from the metal foil and directly loaded into cell. The magnetic mount facilitates rapid assembly of the cartridge in the cell base. The force applied to the electrodes can reach up to 80 N (default) and is adjusted with the micrometer control knob. For 2-electrode measurements the refence electrode feedthrough hole can be closed with a plug.
The cell elements are constructed with materials that are inert to the sample (Stainless steel 316L/317L and PEEK). It well fits aqueous (FKM O-Rings) and organic solvent (FFKM O-Rings) electrolyte requirements. Good electrical contact is ensured by gold plated pins. The construction is gas-tight and can be effortlessly assembled in the glove box, ensuring possible human error reduced to minimum.
This cell can be used for all common battery measurements, such as galvanostatic cycling, cyclic voltammetry or electrochemical impedance spectroscopy. Both liquid and solid state or gel-polymer electrolytes can be studied. Additionally, properties and performance of supercapacitor materials can be investigated. Various materials can be examined, including typical Li-ion electrodes (graphite, NMC, LTO, etc.) and other chemistries – sodium, magnesium, potassium etc. It can also be applied to measure the ionic conductivity of separators and electrolytes. Owing to the micrometer control knob, the relationship between the initial pressure applied to the cell and the performance of solid state electrolytes or metal plating process (anode-free systems) can be studied.
The above graph is for empty cell (i.e. 0 mm electrode stack thickness). To calculate the distance that has to be set to apply desired pressure on the electrode subtract the thickness of electrode stack from the “Distance reading” value. For example, if the pressure on 1 mm thick electrode stack shall be 200 kPa (for ⌀18mm electrodes) the micrometer screw should be set to 7 mm – 1 mm = 6 mm.
recommended electrode diameter: 18 mm
maximum electrode sandwich thickness: 2 mm
spring rate: 11.75 N/mm
maximum spring load: 80 N
operating temperature: -40°C – 80°C (default); -40°C – 180°C (HT option on request)
1 x cell base
1 x pressure adjustment screw
1 x 3-electrode cartridge
1 x punch-type reference electrode
1 x upper plunger (Stainless Steel 316L/317L)
1 x lower plunger (Stainless Steel 316L/317L)
1 x separator locking ring
1 x gold plated piston
1 x compression wave spring (80N)
2 x gold plated pin contact
1 x set of O-Rings
1 x RE termination plug