Multifunctional α-MoO₃ Nanobelt Interlayer with the Capacity Compensation Effect for High-Energy Lithium–Sulfur Batteries

Abstract

Spatial hindrance of lithium polysulfide (LiPS) diffusion by inserting a barrier interlayer has been deemed as an effective strategy to restrict the shuttle effect in lithium−sulfur batteries (LSBs). However, the extra interlayer without reversible capacity production inevitably reduces the actual energy density of the battery. Herein, a freestanding α-MoO 3 nanobelt interlayer with the decoration of TiN nanoparticles and carbon nanotubes (denoted as MCT) is established. To investigate the capacity compensation effect of the MCT during cell operations, X-ray absorption near-edge spectrometry is conducted. It is revealed that MoO 3 can sustain a reversible Li intercalation/deintercalation in a voltage range of 1.8−2.8 V, providing 180 mAh g −1 of extra capacity for compensating sulfur cathode. In addition, the adsorption of the lithiated α-MoO 3 toward LiPSs is further evaluated. By matching a high-loading sulfur cathode (3.0 mg cm −2 ), a superior capacity of 713.3 mAh g −1 can be retained after 100 cycles under the MCT assistance.

In Situ Constructing a TiO2/TiN Heterostructure Modified Carbon Interlayer for Balancing the Surface Adsorption and Conversion of Polysulfides in Li–S Batteries

“…The similar phenomenon is also reported in the previous work. [55][56][57] The obvious one charge plateau at 2.3-2.5 V is related to the oxidation process of Li 2 S 2 /Li 2 S and LiPSs to S 8 . [58] Moreover, the charge/discharge profiles of the other cathodes with the NCFI and without interlayer are presented in Figure S15 (Supporting Information).…”

Interface Interaction between MoO3 and Carbon Dots Derived from Chitosan Promoted the Photocurrent Extraction Ability of Carriers in a Wide Range of the Light Spectrum

“…Heavily doped MoO 3 or oxygen vacancy-tailored MoO 3−x has good plasmonic properties, which can promote interfacial charge transfer through light excitation. MoO 3 -based nanocomposites have been extensively studied in batteries [1][2][3], memristors [4,5], photocatalytic H 2 evolution [6,7], nanohybrid-based biosensors [8], gas sensors [9][10][11], supercapacitors [12,13], electrochromic devices [14] and so on. Regarding the modification of MoO 3 and its nanocomposites, most of research is focused on oxygen vacancy tailoring, metal or non-metal element doping [15,16], interfacial optimisation of different components, mixed dimensionality and multi-phases in nanocomposites to enhance multifunctionality and broaden applications [17][18][19][20][21][22][23][24][25].…”

TiO2-Coated MoO3 Nanorods for Lithium/Sodium-Ion Storage

“…16,17 The layered arrangement of MoO 3 , comprised of MoO 6 octahedra linked by shared oxygen atoms, endows it with notable theoretical capacity, impressive cycle stability, and affordability. MoO 3 has been crafted into various nanoscale shapes, including nanowires, 18 nanobelts, 19,20 nanorods, 21 hollow nanospheres, 22 nanosheets, and thin films, 23 utilizing diverse techniques like thermal evaporation, hydrothermal synthesis, and sol−gel synthesis. This versatility makes it an economically viable substitute for conventional anode materials.…”

“…The unique properties of transition-metal oxides (TMOs) have led to their consideration as prospective anode materials in LIBs/SIBs. − Among the TMOs, molybdenum-based materials have diverse structural compositions and exceptional electrochemical properties, making them versatile for various applications. , In particular, molybdenum trioxide (MoO 3 ) has attracted attention as a promising candidate for addressing the issues associated with conventional anode materials in LIBs/SIBs. , The layered arrangement of MoO 3 , comprised of MoO 6 octahedra linked by shared oxygen atoms, endows it with notable theoretical capacity, impressive cycle stability, and affordability. MoO 3 has been crafted into various nanoscale shapes, including nanowires, nanobelts, , nanorods, hollow nanospheres, nanosheets, and thin films, utilizing diverse techniques like thermal evaporation, hydrothermal synthesis, and sol–gel synthesis. This versatility makes it an economically viable substitute for conventional anode materials.…”