The Lithium-Ion Capacitor (LIC) is a new hybrid energy storage device. Its structure combines the electrical double-layer capacitor (EDLCs) and lithium-ion technology. Its elementary structure is composed of a positive electrode with activated carbon as in double-layer capacitor and a negative electrode based on Li doped carbon similar to the Li-Ion battery. The advantage of the LIC technology compared to the conventional storage device lies in the fact that the power density and the nominal voltage are higher and the energy density is much higher than EDLCs. This paper deals with the electrical and thermal characterization of this new energy storage device. The LIC equivalent series resistance and capacitance are determined based on extended electrical characterization tests. The LIC parameters variations according to the frequency and to the temperature are presented. Finally, the LIC temperature parameters and distribution over the surface area as a function of time is presented and analyzed.