▎ 摘　　要

NOVELTY - An electrochemical cell (10) comprises a first electrode (12) containing an alkali metal and/or an alkaline earth metal (14), a second electrode (16) and a halogenated compound (11) comprising a haloalkane associated with a conjugated system through at least one alkene linker or alkyne linker. The second solid electrode comprises carbon monofluoride. The cell comprises a liquid electrolyte (26) containing the halogenated compound. USE - Electrochemical cell is used as primary battery or secondary battery (claimed). ADVANTAGE - The electrochemical cells have high energy densities and capacities. The cell enables to reach close-to-full dehalogenation of the halogenated compounds, at practical discharge conditions (e.g., 0.3 mA/cm2), to yield 8 -15 e- transfers/molecule and relatively high discharge potentials (e.g.-2.6 volts). Hence, high specific energies (e.g., up to 2565 Wh/kgreactant ) and total capacities (e.g. up to 1140 meter amperes hours (mAh)/greactant) are reached, and halogenated compounds are made strong competitors as electrodes in high-energy batteries (e.g., primary batteries). The presence of halogenated compounds, enables to prevent generation of overpotentials, and allow multiple types of modification (e.g., ring structure, substituent type and position, haloalkene chain length, halogenated group species), to enhance electrochemical performance of the battery. DESCRIPTION OF DRAWING(S) - The drawing shows schematic diagram of electrochemical cell. 10Electrochemical cell 11Halogenated compound 12First electrode 14Metal 16Second electrode 26Liquid electrolyte