A fluorinated macrocyclic organodisulfide cathode for lithium organic batteries.

We design and synthesize a fluorinated macrocyclic organodisulfide through a simple one-step oxidation of 2,5-difluorobenzene-1,4-dithiol in dimethyl sulfoxide. It contains a dimer, trimer, and tetramer of 2,5-difluorobenzene-1,4-disulfide, which are insoluble in ether electrolyte. When evaluated in a lithium half-cell, it delivers a discharge specific capacity of 268.6 mA h g at 0.1C. The capacity retention rate is 78.1% after 200 cycles.