The Study of the Rolling Effects on the Electrochemical Properties of Mos2-Vgcf Based Lithium-Ion Batteries

Abstract

In this study, an electrode slurry composed of molybdenum disulfide (MoS2) and vapor grown carbon fiber (VGCF) prepared through the solid-phase synthesis method was blade-coated onto copper foil to form a thick film as anode for lithium-ion batteries. In the previous reported work, MoS2-based lithium-ion batteries have experienced gradual deformation, fracture, and pulverization of electrode materials during the charge and discharge cycling process, leading to an unstable electrode structure and rapid decline in battery capacity. Furthermore, MoS2 nanosheets tend to aggregate over charge and discharge cycles, diminishing surface activity of the material and resulting in poor electrochemical performance. In this study, we altered the density of the MoS2-VGCF/Cu foil anode electrode by rolling. Three different density of electrode sheets were obtained through varying rolling repetitions. Our study shows the best electrochemical performance is achieved at a material density of 2.2g/cm3, maintaining a capacity of 427mAh/g even after 80 cycles.

Keywords: Molybdenum Disulfide, Lithium-ion Batteries, Anode material, Material Density