Electrochemical device

A method of manufacturing an electrochemical device comprising the steps of:

• providing a flexible substrate carrying a first and a second layer of electrically conductive and electrochemically active material, wherein said layers are spatially separated from each other;
• printing a layer of a printable electrolyte composition,
• wherein the printable electrolyte composition ionically connects the first and second layer, and
• wherein the printable electrolyte composition includes, before drying and curing,
• (i) 20-50% by weight, based on the total amount of the composition, of a radiation-curable base which comprises
• (a) a radiation-curable (meth)acrylate oligomer,
• (b) a (meth)acrylate monomer, and
• (c) a photoinitiator,
• (ii) 20-50% by weight, based on the total amount of the composition, of water, and
• (iii) 10-50% by weight, based on the total amount of the composition, of an electrolyte, wherein the composition has a viscosity of 0.3 Pas or higher;
• and
• curing the printable electrolyte composition by irradiating the printable electrolyte composition with actinic radiation,
• wherein a redox state of said first layer is controllable by means of a voltage applied across said printable electrolyte composition, and
• wherein said first layer is arranged such that a change in the redox state of the first layer alters the electrical conductivity of said first layer.