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In this work, lithium-modified silica nanosalt (Li202) is solution-synthesized and used as a gel-forming additive in 1.5 M tetraethylammonium tetrafluoroborate (TEABF4)/acetonitrile (ACN) electrolyte solution or in the mixture of carbonates-based solvents for the use in supercapacitors and Li-ion batteries. The electrochemical properties of the supercapacitors and Li-ion batteries dopting the Li202 (5 wt.%) are investigated using linear sweep voltammetry, cyclic voltammetry, and complex impedance spectroscopy.