In general, I agree with Mrs Tiwari. However, you have to consider additional, very important aspects: (i) What kind of conductivity is present in your sample? What are the ionic and electronic contributions to the overall conductivity? Both contributions might be separated by a proper choice of the experiment (for an overview see for instance R. A. Huggins, Ionics 8 (2002) 300-313 (ii) At which temperature(s) do you want to perform your measurements? Since the conductivity is strongly affected by the sample's temperature, it should be at least be guaranteed that the temperature is stable and known during the measurement. (iii) Is your sample dimensionally stable, or, do the sample thickness and area change with temperature and with the pressure applied by pressing the electrodes on both sides? This could significantly influence the cell constant. However, in the case of a gel polymer electrolytes you most likely need a spacer material to adjust the sample's thickness. (iv) A proper contact between the electrodes and your sample is needed to avoid an additional contact resistance which might lead to an apparently lower conductivity. In case of a solid sample, this might be achieved by polishing it to a mirror-like surface sputtering gold on it. An example for measuring the dc ionic conductivity of poly electrolytes might be found here: B. Huber et al., Solid State Ionics 247-248 (2013) 15-21.

the simple way is place your sample between two similar electrodes, measure the sample dimension (l = thickness and a= area) also measure the area of electrolyte

apply the formula

conductivity = (1/z)(l/a) where z is real part of impedance which you may get by analyzing your sample using LCR bridge. use the area which is smaller (material or electrode)

Please, in order to avoid headaches, when you go measuring your ionic conductivity use a good meter, like Metrohm or Mettler.

In general, I agree with Mrs Tiwari. However, you have to consider additional, very important aspects: (i) What kind of conductivity is present in your sample? What are the ionic and electronic contributions to the overall conductivity? Both contributions might be separated by a proper choice of the experiment (for an overview see for instance R. A. Huggins, Ionics 8 (2002) 300-313 (ii) At which temperature(s) do you want to perform your measurements? Since the conductivity is strongly affected by the sample's temperature, it should be at least be guaranteed that the temperature is stable and known during the measurement. (iii) Is your sample dimensionally stable, or, do the sample thickness and area change with temperature and with the pressure applied by pressing the electrodes on both sides? This could significantly influence the cell constant. However, in the case of a gel polymer electrolytes you most likely need a spacer material to adjust the sample's thickness. (iv) A proper contact between the electrodes and your sample is needed to avoid an additional contact resistance which might lead to an apparently lower conductivity. In case of a solid sample, this might be achieved by polishing it to a mirror-like surface sputtering gold on it. An example for measuring the dc ionic conductivity of poly electrolytes might be found here: B. Huber et al., Solid State Ionics 247-248 (2013) 15-21.

Just use the Electrochemical Impedance Spectroscopy for measuring the electrical conductivity of the electrolyte (gel or solid). Please see the following paper for the sample holder.

I also attached the publication.

Article Epoxy-silica hybrid organic–inorganic electrolytes with a hi...

first characterized your sample by impedance analyzer. then you can calculate both ionic and electronic conductivity of your sample easily.