NOVELTY - Electrochemically depositing an ionically conducting, electrically insulating coating onto the surface of an electrode material, involves: submersing the electrode material into a solution comprising at least one initiator species dissolved in a solvent; and at least one monomeric species having at least one vinyl group, or vinyl group derivative, on it; submersing a second electrode into the solution; and applying an electric potential between the electrode material and the second electrode effective for reducing the initiator species.    USE - The methods are useful for electrochemically depositing an ionically conducting, electrically insulating coating onto the surface of an electrode material; and for producing a lithium-ion battery (all claimed).    ADVANTAGE - The method provides a suitable coating process for such solid state electrolyte materials, permits control of thickness, provides uniform coatings on complex and 3D surfaces, and has been demonstrated to be cost effective. Also, the method is able to provide a lithium-ion battery with improved performance metrics such as cost, power density, energy density, safety, and cell life.    DETAILED DESCRIPTION - Electrochemically depositing an ionically conducting, electrically insulating coating onto the surface of an electrode material, involves: submersing the electrode material into a solution comprising at least one initiator species dissolved in a solvent, where the initiator species is capable of being reduced forming a radical species when an electron is injected from the electrode material into the initiator species, and where the reduced initiator species is chemisorbed onto the electrode material surface; and at least one monomeric species having at least one vinyl group, or vinyl group derivative, on it; submersing a second electrode into the solution; and applying an electric potential between the electrode material and the second electrode effective for reducing the initiator species; where polymerization of the monomeric species is induced by the reduction of the initiator species forming a coating which is bonded to the surface of the electrode material. An INDEPENDENT CLAIM is included for producing a lithium-ion battery which involves: submersing an electrode comprising electrodeposited Cu2Sb active material into a solution comprising at least one initiator species dissolved in a solvent comprising water, where the initiator species is capable of being reduced forming a radical species when an electron is injected from the Cu2Sb active material into the initiator species, and where the reduced initiator species is chemisorbed onto a surface of the Cu2Sb active material; and at least one monomeric species having at least one vinyl group, or vinyl group derivative on it; submersing a second electrode into the solution; applying an electric potential between the electrode material and the second electrode effective for reducing the initiator species; where polymerization of the monomeric species is induced by the reduction of the initiator species forming a Li+-conducting and electrically insulating coating which is bonded to the surface of the active material; preparing an solution-based slurry comprising at least one cathode material; contacting the coating with the slurry; drying the coating material onto which the cathode material has been deposited; and placing a current collector in electrical communication with the cathode material.