Search

In order to solve the Li-S battery issues caused by the low conductivity of sulfur and the shuttle effect of lithium polysulfides, we successfully developed a spray drying method to prepare graphene oxide (GO) coating Ketjen Black@S composite powders, which is similar to the core-shell structure. The effects of different GO coating content on the battery performances were carefully studied. The results of the electrochemical measurements demonstrate that the 10% GO coating samples showed the best performances. With a high sulfur areal density of 3 mg cm−2, the 10% GO@KB-S cathode shows the highest discharge capacities of 1170.6 mAh g−1 at 0.05 C, 1010.0 mAh g−1 at 0.1 C, 880.1 mAh g−1 at 0.3 C, and 782.8 mAh g−1 at 0.5 C. Furthermore, the cycle retention of the 10% GO coating sample is 77.82% after 100 cycles and 71.13% after 200 cycles with the average coulombic efficiency of approximately 98%. [ABSTRACT FROM AUTHOR]