Analytical cell and method of producing the same

An analytical cell comprising a first substrate and a second substrate which are partially overlapped with each other to form an overlapping portion, the overlapping portion being configured to allow electrolytic solution to be present between the first substrate and the second substrate, an observation window being formed in the overlapping portion, an electron beam being transmittable through the observation window,

• wherein the first substrate and the second substrate have respective through holes extending therethrough in a thickness direction thereof, and also have respective transmission membranes having an electron beam permeability, the transmission membranes being disposed on respective surfaces of the first substrate and the second substrate so as to cover ends of the respective through holes which face each other;
• in the overlapping portion, a solid state joint is provided in which a first solid portion protruding from the first substrate and a second solid portion protruding from the second substrate are connected together so that the first substrate and the second substrate are fixed and maintained in position relative to each other by the solid state joint, surfaces of the substrates are spaced from each other by a predetermined distance, and the substrates are positioned to form the observation window at a position where the through hole of the first substrate and the through hole of the second substrate face each other across the transmission membranes;
• in a space within the overlapping portion, a negative electrode active material and a positive electrode active material are provided, and the negative electrode active material and the positive electrode active material are spaced from each other so that when the electrolytic solution is present the electrode active materials contact the electrolytic solution individually;
• and
• a negative electrode collector and a positive electrode collector extend from an inside of the overlapping portion to an outside thereof so as to be exposed to the outside, and the negative electrode collector and the positive electrode collector are electrically connected respectively to the negative electrode active material and the positive electrode active material inside the overlapping portion.