Improvement of cycle property of sulfur electrode for lithium/sulfur battery

Although a theoretical specific capacity of lithium/sulfur redox couple battery is 1672 mAh/g, lithium/sulfur battery has the serious problems of low utilization of active material and poor rechargeability, due to the loss of active material in the form of soluble polysulfides (Li2Sn, n > 2). In this study, carbon nano-fiber having average fiber diameter of 150 nm was added into the sulfur electrode in order to improve cycling property. The effect of binder on cycling property was also investigated. All cycle tests were conducted in the range of 1.5–3.2 V at room temperature. Sulfur electrodes with carbon nano-fiber using PEO and PVdF as binders, respectively, showed better cycle property than sulfur electrode without carbon nano-fiber.