محمدباقر سبحان منش

In the past decade, aluminum-ion batteries have entered the world of batteries with attractive features such as cheapness, a high number of charge and discharge cycles, optimal safety, high volumetric capacity, flexibility and high charge, and discharge Rate. One of the challenges of these batteries is their low gravimetric capacity compared to lithium-ion batteries. Efforts are being made to enhance the capacity of these batteries by strengthening the cathode structure. In this research, three cathode materials including graphene oxide (GO), reduced graphene oxide (RGO), reduced graphene oxide and tin oxide quantum dots composite (RGO/SnO2 QDs) were prepared. The structural properties of the materials were investigated using X-ray diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM) and Brunauer-Emmett-Teller (BET). A slurry was prepared with each of the cathode materials separately and coated onto graphite sheet. The resulting cathodes and the graphite sheet cathode were paired with an aluminum anode in an electrolyte containing aluminum ions to form four batteries for the study. In the first part of the study, an AlCl3 1M aqueous solution was used, and in the second part, an AlCl3/Et3NHCl ionic liquid was utilized as the electrolyte. The electrochemical performance of the resulting batteries was eva‎luated using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge-discharge tests. The aqueous aluminum-ion battery using the RGO/SnO2 QDs cathode demonstrated a specific discharge capacity of 193 mAh g−1 at a current density of 400 A g−1 after 100 charge-discharge cycles, with a columbic efficiency of 103%. The long-term cycling performance of the battery was eva‎luated as very good after 5620 charge-discharge cycles at a current density of 1500 A g−1 compared to other batteries studied, showing only a 6% decrease in capacity to 78 mAh g−1 after 100 cycles. The columbic efficiency for the latter cycles of this battery was recorded at 95%. The RGO/SnO2 QDs cathode in the non-aqueous aluminum-ion battery exhibited excellent specific discharge capacity of 231 mAh g−1 at a current density of 2 A g−1 after 300 consecutive charge-discharge cycles, along with a columbic efficiency of 98%. After approximately 25,000 consecutive charge-discharge cycles at a current density of 2.5 A g−1, the specific discharge capacity of the battery was recorded at 163 mAh g−1 with a columbic efficiency of 89%. Both aluminum-ion batteries with aqueous and non-aqueous electrolytes showed very good charge-discharge rate performance compared to three other batteries, indicating that the RGO/SnO2 QDs composite can be selected as a suitable candidate for the cathode of aluminum-ion batteries.

باتري آلومينيوم يون آبي , باتري آلومينيوم يون ناآبي , اكسيد قلع , نقاط كوانتومي , گرافن

Aqueous aluminum ion battery , Non-aqueous aluminum ion battery , Tin oxide , Quantum dots , Graphene

mohammad bagher sobhanmanesh

seyyed mohammad reza milani hosseini, ali ghaffarinejad