MoO3@MoS2 Nanosphere as High-Performance Anode Materials for Lithium-lon Batteries

As a promising electrode material for lithium ion energy storage, metal sulfide oxides with a core-shell nanostructure have high attractiveness. Here, we successfully synthesized MoO₃ @ MoS₂ core-shell structure material through a simple one-step hydrothermal method. The materials were characterized by scanning electron microscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. MoO₃ @ MoS₂ used as the negative electrode material of lithium-ion batteries has achieved initial discharge/charge capacities of 1402.5 mA h g^-1 and 1052.4 mA h g^-1 at a current rate of 0.5C, and the initial coulombic efficiency is about 75.04%. The material exhibits excellent rate performance. When the current rates are 0.2C, 0.5C, 1C, 2C, 5C, and 10C, the specific discharge capacity is 981.1 mA h g^-1, 866.7 mA h g^-1, 803.2 mA h g^-1, 717.0 mA h g^-1, 603.8 mA h g^-1 and 454.0 mA h g^-l. This excellent electrochemical performance is mainly attributed to the small-sized nanostructure, which can increase the lithium contact area and the cycle capacity of the battery and the possible interface charging mechanism of the material interface called the pseudocapacitance effect, which not only reduces the repeated cycle process in the mechanical stress, but also provides good electrical conductivity. At the same time, the article also explored the electrochemical performance of MoO₃ @ MoS₂ as an electrode material for a lithium-ion battery integrated with a negative electrode separator.