Diphenyl guanidine as vulcanization accelerators in sulfurized polyacrylonitrile for high performance lithium-sulfur battery

Abstract A comparative study on the effect of different vulcanization accelerators on the electrochemical performance of sulfurized polyacrylonitrile cathodes is conducted for the first time. Compared with these vulcanization accelerators, the sulfurized polyacrylonitrile composite prepared by diphenyl guanidine vulcanization accelerator significantly enhances discharge capacity and cycling stability. Diphenyl guanidine dramatically improves the sulfur content by 14 wt%, resulting in a remarkable discharge capacity of 897 mA h gcomposite−1 at a rate of 0.1C (1C = 700 mA g−1) corresponding Li-S batteries, while maintain the outstanding cycling stability. Therefore, diphenyl guanidine can be used as a vulcanization accelerator in the formulation of a high-capacity sulfurized polyacrylonitrile cathodes.