NOVELTY - The half-accumulator (1) comprises an electrode formed by an electron collector containing transition metals and an electrochemically active material, and a continuous layer of a solid electrolyte and lithium ion conductor impermeable to water and air completely covering the surface of the nanostructured active material of the electrode. The electrochemically active material is present on the surface of the electron collector in the form a nanostructured conversion layer containing nanoparticles having an average diameter of 1-1000 nm.    USE - The half-accumulator is useful in an electrochemical generator.    ADVANTAGE - The half-accumulator can economically and efficiently manufactured with less consumption of energy and high electrical property thus improving the performance and life of the electrochemical generator.    DETAILED DESCRIPTION - The half-accumulator (1) comprises an electrode formed by an electron collector containing transition metals and an electrochemically active material, and a continuous layer of a solid electrolyte and lithium ion conductor impermeable to water and air completely covering the surface of the nanostructured active material of the electrode. The electrochemically active material is present on the surface of the electron collector in the form a nanostructured conversion layer containing nanoparticles having an average diameter of 1-1000 nm. The electrochemically active material contains a compound of transition metal or transition metals present in the electron collector. The electrode has a textile structure made of metal threads with a nanostructured surface conversion layer forming the active material of the electrode. The textile structure is a woven structure. The equivalent diameter of the cross section of metal threads covered by a conversion layer of active material is 10-50 mu m. The lithium ion conductor solid electrolyte is a ceramic material, and a layer of a hydrophobic polymer impregnated with a hydrophobic ionic liquid containing non hydrolyzable lithium salt, and has a thickness of 2-10 mu m. The thickness of the lithium ion conductor electrolyte layer is thin enough for not to close the mesh of the textile structure formed by the electrode. An INDEPENDENT CLAIM is included for an electrochemical generator.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of an electrochemical generator.    Half-accumulator (1)    Electrons (3)    Active electrochemical material (4)    Solid electrolyte (5)    Aqueous liquid electrolyte. (6)