A Novel Aluminum-Ion Battery: Al/AlCl3-[EMIm]Cl/Ni3S2@Graphene

Due to an ever‐increasing demand for electronic devices, rechargeable batteries are attractive for energy storage systems. A novel rechargeable aluminum‐ion battery based on Al3+ intercalation and deintercalation is fabricated with Ni3S2/graphene microflakes composite as cathode material and high‐purity Al foil as anode. This kind of aluminum‐ion battery comprises of an electrolyte containing AlCl3 in an ionic liquid of 1‐ethyl‐3‐methylimidazolium chloride ([EMIm]Cl). Galvanostatic charge/discharge measurements have been performed in a voltage range of 0.1–2.0 V versus Al/AlCl4 −. An initial discharge specific capacity of 350 mA h g−1 at a current density of 100 mA g−1 is achieved, and the discharge capacity remains over 60 mA h g−1 and coulombic efficiency of 99% after 100 cycles. Typically, for the current density at 200 mA g−1, the initial charge and discharge capacities are 300 and 235 mA h g−1, respectively. More importantly, it should be emphasized that the battery has a high discharge voltage plateau (≈1.0 V vs Al/AlCl4 −). These meaningful results represent a significant step forward in the development of aluminum‐ion batteries. A novel rechargeable aluminium‐ion battery based on Al3+ intercalation and deintercalation is fabricated with Ni3S2/graphene micro‐flakes composite as cathode materials and high‐purity Al foil as ­anode. It is clear that two batteries in series can light the red light‐emitting diode (LED) lamp, and the discharge capacity remains over 60 mA h g−1 and coulombic efficiency of 99% after 100 cycles.