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A New Generation of Rechargeable Aluminum Ion Battery Technology

Monday, 14 May 2018
Ballroom 6ABC (Washington State Convention Center)
K. L. Ng, M. Malik, and G. Azimi (University of Toronto)
Among available energy storage technologies, rechargeable batteries rank at the top, as they offer the required energy and power density and on-demand response. Although there are several battery technologies available in the market – including lead-acid and Li-ion batteries – the future of these technologies, is of concern, because in addition to cost and safety related challenges, we may face material deficits due to the increasingly high demand and geopolitically restricted abundance. Therefore, it is imperative to develop efficient and economically viable battery technologies that rely on more earth abundant elements. Among potential candidates, aluminum ranks high because of low cost, high abundance, high volumetric capacity, and ability to exchange three electrons. Despite positive attributes, some previous studies on aluminum ion batteries have faced several challenges, including anode passivation, cathode degradation, low voltage, and lack of a stable electrolyte. Here we present a new generation of aluminum ion batteries made of an alloy of aluminum as the anode and a nanotextured activated graphitic sheet as the cathode. The electrolyte is composed of an organic solvent containing aluminum ions. Charge-discharge cycling indicates that cells are stable with minimal capacity decay and they show high discharge voltage and specific capacity. To elucidate the mechanism of electrochemical reactions within the cell, we utilized various microscopy and spectroscopy techniques including X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy energy dispersive spectroscopy (SEM-EDS), transmission electron microscopy (TEM) before and after charge-discharge cycles. This research is ongoing to further develop and refine this innovative battery technology, which could enable sustainable generation and efficient utilization of electric energy.