Vapor Growth Carbon Fiber Felt as an Efficient Interlayer for Trapping Polysulfide in Lithium-Sulfur Battery

Lithium-sulfur (Li-S) batteries with high theoretical specific capacity and energy density are consider as one of the most promising electrical energy storage application. However, the practical use of Li-S batteries is hindered mainly due to the serious polysulfide shuttling phenomenon. Therefore, the best way to enhance the electrochemical performance of Li-S battery is controlling the shuttling effect caused by the dissolution of polysulfide in the electrolyte. Herein, three different carbon felts were prepared by using vapor growth carbon fiber (VGCF), activated carbon (AC) and super P (SP), respectively, and were used as interlayer between cathode and separator to trap intermediates polysulfides. As a result, the Li-S battery with VGCF interlayer showed high specific initial discharge capacity of 1262 mAh g -1 and superior cycling performance (836 mAh g -1 after 100 cycle) at 0.1C.