Superior stable sulfur cathodes of Li-S batteries enabled by molecular layer deposition.

For the first time, we report the employment of an ultrathin alucone film enabled by the molecular layer deposition technique to dramatically stabilize the sulfur cathodes for Li-S batteries. The alucone coated C/S cathode displayed over two-times higher discharge capacity than the pristine one after 100 cycles, demonstrating a greatly prolonged cycle life.