▎ 摘　　要

NOVELTY - Electrochemical cell (10) comprises a first electrode (12) comprising an alkali metal and/or an alkaline earth metal (14); a second electrode (16); and a halogenated compound (11) comprising at least one sulfur pentafluoride group associated with a conjugated system. USE - Electrochemical cell, such as primary battery or a secondary battery (claimed). ADVANTAGE - The electrochemical cells exhibit high energy densities and capacities. The close-to-full dehalogenation of the halogenated compounds can be achieved at practical discharge conditions (e.g., 0.3 mA/cm2), yielding between 8-15 electron stransfers per molecule and relatively high discharge potentials (e.g., 2.6 Volts). As a result, high achievable specific energies (e.g., up to 2565 Wh/kg reactant) and total capacities (e.g., up to 1140 mAh/g reactant) are attainable, making the halogenated compounds a strong competitor as electrodes in high-energy batteries (e.g., primary batteries). The structure of the halogenated compounds additionally allows for multiple types of modification (e.g., ring structure, substituent type and position, haloalkene chain length, halogenated group species), which can directly affect the reduction of these molecules. The use of halogenated compound in an electrochemical cell provides an enhanced electrochemical performance, such as an increased specific energy. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an electrochemical cell. 10Electrochemical cell 11Halogenated compound 12First electrode 14Metal 16Second electrode