An integrated approach towards enhanced performance of Lithium Sulfur Battery and its fading mechanism.

To fulfil the potential of Li-S batteries (LSBs) with high energy density and low cost, multiple challenges need to be addressed simultaneously. Most research in LSBs have been focusing on sulfur cathode design, while the performance are also known to be sensitive to other parameters such as binder, current collector, separator, lithium anode, and electrolyte. Here, an integrated LSB system based on the understanding of the different roles of binder, current collector, and separator is developed. By using the cross-linked carboxymethyl cellulose-citric acid (CMC-CA) binder, Toray carbon paper current collector, and reduced graphene oxide (rGO) coated separator, LSBs achieve a high capacity of 960 mAh g-1 after 200 cycles (2.5 mg cm-2) and 930 mAh g-1 after 50 cycles (5 mg cm-2) at 0.1C. Moreover, the failure mechanism at a high sulfur loading with character of fast capacity decay and infinite charging are discussed. This work highlights the synergistic effect of different components and the challenges towards more reliable LSBs of high sulfur loading.