Search

The traditional MoSe 2 anode material for lithium-ion batteries has poor cyclic stability and relatively low capacity, which hinders its practical application. Herein, high capacity of Si and Se are exploratively incorporated into two-dimensional MoSe 2 nanopetals to configure Se@MoSe 2 /Si composite. The optimized Se@MoSe 2 /Si composites have both high capacity and good electrochemical stability with a high retention capacity of 1187.7 mAh/g after 200 cycles at 100 mA/g current density. The visible depression on volumetric expansion is observed on the configuration of Se@MoSe 2 /Si. The admirable function of silicon on the enhancement of the electrochemical activity and the conductivity of Se@MoSe 2 is theoretically demonstrated by First-principles calculations. This mutually beneficial interaction between the components demonstrates a promising synergistic effect on Se@MoSe 2 /Si. [ABSTRACT FROM AUTHOR]

Red phosphorus for lithium-ion batteries (LIBs) is considered to be promising electrode material due to the high theoretical capacity and moderate working potential. However, the enormous volumetric expansion and intrinsic poor electrical conductivity result in poor interfacial stability and sluggish reaction kinetics. Herein, different functional conductive polymers are introduced to modify the interface, aiming to improve the interfacial compatibility and mechanical stability between red phosphorus and matrix materials. The Cobalt polyphthalocyanine (CoPPc)/polydopamine (PD) hybrid interface not only facilitates electron transfer within the system, but also accommodate the volume expansion of red phosphorus. Consequently, the novel P/CoPPc@PD anode achieves a stable specific capacity of 650 mAh g−1 after 580 cycles at 200 mA g−1, and a discharge capacity of 385 mAh g−1 at 5.0 A g−1 even after 10,000 cycles, demonstrating outstanding long-term cycling stability and rate performance. The synergistic interfacial effects of CoPPc and PD not only improve the conductivity of the anode material, but also constructs a mechanical buffering layer for the volume expansion of phosphorus. Hence, the rational design strategy of P/CoPPc@PD anode for LIBs reveals excellent cycle stability and promising application. [Display omitted] • Inorganic/organic hybrid interface was configured for red phosphorus. • CoPPc can facilitate the electron transport of red phosphorus anode. • The PD elastic buffer layer can alleviate the volume change of red phosphorus. • The CoPPc@PD hybrid layer improves the kinetics and structural integrity. [ABSTRACT FROM AUTHOR]

• The built-in electric field between the Mn 3 O 4 -MnS enhances the carrier transport. • The core–shell structure enables high mechanical stability. • Mediated pseudo-capacitance is induced by the configuration of Si@Mn 3 O 4 -MnS/C. • The vacancy-enriched Si@Mn 3 O 4 -MnS/C presents excellent cyclability. A configuring vacancy-enriched Mn oxide/sulfide embedded in amorphous carbon layer with highly concentrated vacancies to encapsulate silicon was tentatively explored to overcome the long-term stabilization issues of silicon active center. Our experimental results demonstrate that the configuration of vacancy-enriched Mn 3 O 4 -MnS/carbon hybrid coating layer not only functions as a physical separation layer to prevent silicon from direct contact with electrolytes, but also works as an interesting intermediator to facilitate the structure stabilization and the deep utilization of silicon core center. The surface pseudo-capacitive effect dramatically benefits to the modification of the rate performance of silicon. The synthesized Si@Mn 3 O 4 -MnS/C anode material maintains a high reversible capacity of 830 mAh/g after undergoing 200 charge–discharge cycles at 200 mA g−1 current density. [ABSTRACT FROM AUTHOR]