A high-efficiency, high-temperature, sodium-based electrochemical cell comprises an outer steel casing (12) coated with nickel, elongated parallelepiped in shape, a ceramic electrolyte (14) in the shape of a tubular body made of β-alumina inserted in said outer casing, a plurality of capillary profiles consisting of shaped sheets (16), arranged between said outer casing (12) and ceramic electrolyte (14) with respect to which they leave an interspace, and a current collector (18) of metal material coaxially inserted and stabilised in the ceramic electrolyte (14). Said current collector is formed by a tubular body defining a cavity at least partially filled with PCM (phase change materials) material.
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