2D/1D V2O5 Nanoplates Anchored Carbon Nanofibers as Efficient Separator Interlayer for Highly Stable Lithium–Sulfur Battery

Abstract

Quick capacity loss due to the polysulfide shuttle effects is a critical challenge for high-performance lithium–sulfur (Li–S) batteries. Herein, a novel 2D/1D V2O5 nanoplates anchored carbon nanofiber (V-CF) interlayer coated on standard polypropylene (PP) separator is constructed, and a stabilization mechanism derived from a quasi-confined cushion space (QCCS) that can flexibly accommodate the polysulfide utilization is demonstrated. The incorporation of the V-CF interlayer ensures stable electron and ion pathway, and significantly enhanced long-term cycling performances are obtained. A Li–S battery assembled with the V-CF membrane exhibited a high initial capacity of 1140.8 mAh·g−1 and a reversed capacitance of 1110.2 mAh·g−1 after 100 cycles at 0.2 C. A high reversible capacity of 887.2 mAh·g−1 is also maintained after 500 cycles at 1 C, reaching an ultra-low decay rate of 0.0093% per cycle. The excellent electrochemical properties, especially the long-term cycling stability, can offer a promising designer protocol for developing highly stable Li–S batteries by introducing well-designed fine architectures to the separator.

High-Performance Cataluminescence Sensor Based on Nanosized V2O5 for 2-Butanone Detection

“…Vanadium oxide (V 2 O 5 ) has gained much research interest because of its excellent structural flexibility, lower bandgap and high energy density [ 29 , 30 ]. These features enable V 2 O 5 to be utilized for numerous applications including gas sensing.…”

Linear-PEI-Derived Hierarchical Porous Carbon Nanonet Flakes Decorated with MoS2 as Efficient Polysulfides Stabilization Interlayers for Lithium–Sulfur Battery

“…Two broad peaks centered at around 24.2°and 44.3°are found for both samples, which can be assigned to diffractions from (002) and (100) planes of carbon. 43 For the CNNFs-MoS 2 , additional peaks centered at 14.4°, 33.4°, 39.4°, and 59.0°, are observed, which can be assigned to diffractions from (002), ( 101 42 confirming the formation of 2H-MoS 2 after hydrothermal treatment. Meanwhile, all peaks are weak and broadened, indicating the relative weak crystallinity of the as-synthesized MoS 2 .…”

“…37,38 However, the nonpolar nature of carbon usually causes poor affinity with the polar polysulfides, thus, the shuttling of polysulfides cannot be efficiently hindered. 39 Proper deposition of polar additives, such as Ti 2 C 3 , 40 VN, 41 MoS 2 , 42 V 2 O 5 , 43 etc., can help stabilize the chemical interactions with polysulfide species to prevent the active material loss. However, as indicated by Lai 44 and Wei, 7 continuous trapping of LiPSs in the interlayer pores can inevitably block up the Li + pathway, thus suppressing the overall electrochemical performances especially when the charging and the discharging are taken at a high current density.…”

“…Interlayers, layers between the cathode and the separator, or the so-called separator modification layers, can serve as effective blocking components to encapsulate LiPSs and suppress their shuttling in electrolyte without interrupting the electrolyte ion transportations. , Up to now, various conductive porous carbonaceous materials, such as active carbon, carbon nanotube networks, porous carbon flasks, graphene oxide (GO), and reduced graphene oxide (r-GO), have been applied as the physical barriers and also the secondary collectors for polysulfide stabilization. , However, the nonpolar nature of carbon usually causes poor affinity with the polar polysulfides, thus, the shuttling of polysulfides cannot be efficiently hindered . Proper deposition of polar additives, such as Ti 2 C 3 , VN, MoS 2 , V 2 O 5 , etc., can help stabilize the chemical interactions with polysulfide species to prevent the active material loss. However, as indicated by Lai and Wei, continuous trapping of LiPSs in the interlayer pores can inevitably block up the Li + pathway, thus suppressing the overall electrochemical performances especially when the charging and the discharging are taken at a high current density.…”

Assembly of MXene/PP Separator and Its Enhancement for Ni-Rich LiNi0.8Co0.1Mn0.1O2 Electrochemical Performance

“…Moreover, due to the special characteristics of two-dimensional materials, numerous pioneering reports are associating with the modified separators with transient metal-based 2D structures. Zhang et al [ 18 ] anchored a new type of 2D/1D V 2 O 5 nanoplate to the carbon nanofiber (V-CF) middle layer of a PP separator to enhance the electrochemical stability of lithium-sulfur batteries. Li et al [ 19 ] studied functional porous bilayer composite separators for application in the high-current density lithium metal anodes.…”