Organic/inorganic composite electrolyte and electrochemical device prepared thereby

A method for manufacturing an electrode having an organic/inorganic composite porous coating layer comprising porous inorganic particles and a binder polymer, wherein the porous inorganic particles have pores having such a size that lithium ions (Li30) solvated in an electrolyte solvent can pass therethrough, the method comprising the steps of:

• (a) dispersing inorganic precursors and heat-decomposable compounds in a dispersion medium, misting the inorganic precursor solution, and performing a thermal decomposition and a crystallization processes, to thereby prepare the porous inorganic particles, wherein the porous inorganic particles have pores with an average diameter of 50 nm to 1 μm, wherein at least some of the inorganic particles have lithium ion conductivity;
• (b) adding and mixing the porous inorganic particles to a polymer solution in which the binder polymer is dissolved;
• and
• (c) coating the mixture of step (b) onto a preliminarily formed electrode and drying to form the organic/inorganic composite porous coating layer on the electrode.