PPy-Coated Mo3S4/CoMo2S4 Nanotube-like Heterostructure for High-Performance Lithium Storage

Abstract

Heterostructured materials show great potential to enhance the specific capacity, rate performance and cycling lifespan of lithium-ion batteries owing to their unique interfaces, robust architectures, and synergistic effects. Herein, a polypyrrole (PPy)-coated nanotube-like Mo3S4/CoMo2S4 heterostructure is prepared by the hydrothermal and subsequent in situ polymerization methods. The well-designed nanotube-like structure is beneficial to relieve the serious volume changes and facilitate the infiltration of electrolytes during the charge/discharge process. The Mo3S4/CoMo2S4 heterostructure could effectively enhance the electrical conductivity and Li+ transport kinetics owing to the refined energy band structure and the internal electric field at the heterostructure interface. Moreover, the conductive PPy-coated layer could inhibit the obvious volume expansion like a firm armor and further avoid the pulverization of the active material and aggregation of generated products. Benefiting from the synergistic effects of the well-designed heterostructure and PPy-coated nanotube-like architecture, the prepared Mo3S4/CoMo2S4 heterostructure delivers high reversible capacity (1251.3 mAh g−1 at 300 mA g−1), superior rate performance (340.3 mAh g−1 at 5.0 A g−1) and excellent cycling lifespan (744.1 mAh g−1 after 600 cycles at a current density of 2.0 A g−1). Such a design concept provides a promising strategy towards heterostructure materials to enhance their lithium storage performances and boost their practical applications.

In Situ Hybridization Strategy Constructs Heterogeneous Interfaces to Form Electronically Modulated MoS2/FeS2 as the Anode for High-Performance Lithium-Ion Storage

“…The elemental mapping analysis (Figure 1i-l) shows the rectangular distribution of Mo (green), Fe (red), and S (blue) in MoS 2 /FeS 2 . The intimate contact interface between MoS 2 and FeS 2 significantly optimizes the lithium-ion transport path and enhances lithium-ion storage performance [24]. TEM is conducted to demonstrate the presence of an interfacial structure betwee MoS2 and FeS2.…”

Exploring the Influence of Morphology on Bipolaron–Polaron Ratios and Conductivity in Polypyrrole in the Presence of Surfactants

“…Additionally, regarding the electrostatic force that might have occurred from Fe + between particles, as mentioned above [ 54 , 55 ], this interaction force may disrupt sheet-like forming and increase porosity in the PPy structure [ 59 ]. Some works reported that a specific higher porous PPy structure represented a higher surface area and an increase in its electronic properties [ 60 , 61 ].…”

Charge Storage Properties of Ferrimagnetic BaFe12O19 and Polypyrrole–BaFe12O19 Composites

“…The goal of this investigation was the development of advanced BFO and BFOpolypyrrole (PPy) electrodes with high active mass loading for energy storage in supercapacitors. PPy is a conductive redox-active polymer that is used for many advanced energy storage and catalytic applications [26][27][28][29][30][31]. This polymer and its composites exhibit good charge storage properties, which are especially important for supercapacitors [31,32].…”