Willow Leaf-Shaped ReSe ₂@C as Positive Electrode Material for Aluminum-Ion Batteries

Abstract

Recently, aluminum-based batteries have received extensive attention and research in various countries because of their absolute advantages in terms of cost, energy density, and safety performance compared to other metals-based batteries. Herein, we synthesized ReSe₂@C with willow leaf-shaped as the positive electrode of aluminum batteries. ReSe₂ is encapsulated in carbon by using weak interlaminar van der Waals force and anisotropic crystal structure. The lower lattice symmetry increases the ion/electron adsorption sites and reduces the energy barrier of aluminochloride ion intercalation between ReSe₂ layers. Through electrochemical and XPS analysis of ReSe₂@C, it is known that AlCl₄- is intercalated/embedded in host material during charging/discharging. Meanwhile, ReSe₂@C specific discharge capacity remains 88 mAh g^-1 at 100 mA g^-1 after 1000 cycles with high Coulomb efficiency up to 98%.

Keywords: Willow Leaf-Shaped, Aluminum intercalation, Aluminum ion battery