NOVELTY - The electrochemical cell (2) useful in energy storage assembly, comprises a cathode electrode (K) having an active material based on a lithium-transition metal oxide, and an anode electrode (A) having an amorphous carbon material with a higher lattice disorder than graphite. The cathode and anode electrodes are separated by a separator (E), which comprises a polymer or a polymer composite. The anode electrode has an open circuit voltage curve with a total travel of 0.7 V and a steep voltage discharge curve without a saddle point. The amorphous carbon contains hard carbon or soft carbon.    USE - The electrochemical cell is useful in an energy storage assembly, which is useful as a primary/secondary energy storage device separately or in combination with other energy storage devices in a vehicle power supply system for hybrid type electric car (all claimed), where the energy storage assembly is lead-acid battery, lithium-ion battery, nickel metal hydride battery, nickel-cadmium battery and electric double layer capacitor.    ADVANTAGE - The electrochemical cell exhibits good characteristics such as a maximum voltage of 100-450 V with current of 500 A, high operation safety and a high reliability e.g. up to 15 years under extreme charge/discharge conditions e.g. high temperature for an electric or hybrid type electric vehicle.    DETAILED DESCRIPTION - The electrochemical cell (2) useful in energy storage assembly, comprises a cathode electrode (K) having an active material based on a lithium-transition metal oxide, and an anode electrode (A) having an amorphous carbon material with a higher lattice disorder than graphite. The cathode and anode electrodes are separated by a separator (E), which comprises a polymer or a polymer composite. The anode electrode has an open circuit voltage curve with a total travel of 0.7 V and a steep voltage discharge curve without a saddle point. The amorphous carbon contains hard carbon or soft carbon. The hard carbon is a head-decomposed by pyrolysis and carbon fiber e.g. cotton cloth. The hard carbon is prepared by blending lithium compound with hard/soft carbon precursor to form hard carbon/lithium compound blend used as electrode conductive material of the anode electrode. The carbon precursor comprises petroleum-based pitch, phenol, cellulose, cotton cloth and/or phenol resin.    DESCRIPTION OF DRAWING(S) - The diagram shows a view of an electrochemical cell.    Electrochemical cell (2)    Inner cathode electrode conductor (5A)    Inner anode electrode conductor. (5K)