Functional Separator Modified with Reduced Graphene Oxide and Fe₃S₄ for High-Performance Lithium–Sulfur Batteries

Abstract

In recent years, due to energy shortage and environmental pollution, lithium–sulfur batteries (LSBs) with low cost, high energy density, and environmentally friendly characteristic have attracted wide attention. However, the shuttle effect caused by lithium polysulfides (LiPSs) greatly reduces the cycle performance and life of LSBs. To solve this problem, we design an Fe3S4/rGO composite by the one-step hydrothermal method, which is used to modify the polypropylene (PP) separator. The Fe3S4/rGO composite has high electronic conductivity and adsorption performance, which provides channels for electron transfer and effectively inhibits the shuttle of LiPSs. The lithium–sulfur battery assembled with an Fe3S4/rGO-PP separator possesses the satisfactory specific capacities. The first discharge capacity reaches 1293 mAh g–1 at 0.2 C, and the discharge capacity maintains at 750 mAh g–1 after 100 cycles. After 300 cycles at 1 C, the discharge capacity is 578 mAh g–1, and the average capacity attenuation rate per cycle is 0.052%. These results indicate that the Fe3S4/rGO-PP separator would have a good application prospect for high-performance LSBs.

TiO2 Quantum Dots/Fe3S4 Heterojunction Nanocomposites for Efficient Ammonia Production through Nitrogen Fixation upon Simulated Sunlight

“…The fringe spacing of 3.50 Å corresponds to the (101) plates of TiO 2 QDs, 33 and the fringe spacing of 2.95 Å indexes to the (311) plate of Fe 3 S 4 . 34 The results from the HRTEM analysis match well with the X-ray diffraction (XRD) pattern in the formation of heterojunction in the TiO 2 QDs/Fe 3 S 4 20% nanocomposite. The crystalline nature of the TiO 2 QDs/Fe 3 S 4 20% nanocomposite was also confirmed by the selected area electron diffraction (SAED) analysis.…”

“…The distance between plates of TiO 2 QDs and Fe 3 S 4 semiconductors was investigated using an HRTEM image, and the results are shown in Figure c. The fringe spacing of 3.50 Å corresponds to the (101) plates of TiO 2 QDs, and the fringe spacing of 2.95 Å indexes to the (311) plate of Fe 3 S 4 . The results from the HRTEM analysis match well with the X-ray diffraction (XRD) pattern in the formation of heterojunction in the TiO 2 QDs/Fe 3 S 4 20% nanocomposite.…”

Fe3C-Decorated Folic Acid-Derived Graphene-like Carbon-Modified Separator as a Polysulfide Barrier for High-Performance Lithium-Sulfur Batteries

“…TGA curves for KB/S; Figure S2 S1. Performance comparison between this work and relevant previous research [44][45][46][47][48][49][50].…”

Recent advances in modified commercial separators for lithium–sulfur batteries

“…197 Graphene derivatives, such as graphene oxide (GO) and reduced graphene oxide (rGO), have many or some oxygen functionalization and are much more common in literature as they are easier to prepare while sharing similar properties with perfect graphene. 198 As modifiers for commercially available polyolefin separators, graphene and its derivatives reduce the shuttle effect via ionic sieving with controllable pore sizes and enhanced LiPS reduction kinetics owing to increased electron mobility. Because GO has abundant oxygen groups, they can contribute to LiPS rejection via chemisorption and electrostatic repulsion.…”