High-Performance All-Solid-State Lithium–Sulfur Battery Assembly Using a Sulfur/Reduced Graphite Oxide Cathode and Dual-Anion Solid Polymer Electrolyte

The expanding mid-to-large battery market necessitates high-capacity batteries with long cycle life and safety. Li–S batteries are suitable energy storage devices because of their reversibility and inexpensive energy storage. However, limitations include the shuttle effect and dendrite growth at the anode. Sulfur particles disperse in a functionalized reduced graphite oxide (rGO) cathode and an ionic liquid-containing cross-linked poly(ethylene oxide)–lithium bis(fluoromethanesulfonyl)imide –N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide-based solid polymer electrolyte (SPE, PEO–LiFSI0.1(Pyr14TFSI)0.4) are hot-pressed into an integrated electrode, serving as both the cathode and electrolyte in an all-solid-state (ASS) Li-S batteries. The S/rGO-based solid-state Li–S batteries show a more stable performance than the Li–S batteries using liquid electrolytes, indicating that the dual-anion SPE layer effectively suppresses dendritic lithium formation and the shuttle effect. At 0.1 C, the discharge capacities of the battery are 957 mAh g−1 in the first cycle and 576 mAh g−1 after 100 cycles, respectively. At 1 C, the reversible capacity is 590 mAh g−1, with 417 mAh g−1 after 100 cycles (capacity retention = 71%). Therefore, S/rGO//LiFSI0.1(Pyr14TFSI)0.4-integrated electrodes benefits the ASS Li-S batteries.