Ultrahigh voltage and energy density aluminum‐air battery based on aqueous alkaline‐acid hybrid electrolyte

Abstract

Thanks to the high theoretical capacity and energy density, abundant resource, low-cost, and environmental friendliness, aluminum-air battery (AAB) has attracted research interests driven by the promise for electricity generator. However, low operating voltage leads to low practical energy density, and restricting the applications of AAB. In this study, the concept of an ultrahigh voltage AAB based on aqueous alkaline-acid hybrid electrolyte is introduced and demonstrated. Meanwhile, the working mechanism is investigated. And the open-circuit voltage of the novel designed battery is 2.56 V, 29.9% higher than conventional alkaline AAB. Thanks to the fluid electrolyte, the decline in discharge voltage caused by the change in pH is overcome. And a high-energy density of 4591 mWh g Al −1 is achieved at a discharge voltage of around 2.08 V at 10 mA cm −2. These results provide a viable approach to improve the performance of Al-air battery.

Anode Interfacial Layer Construction via Hybrid Inhibitors for High-Performance Al–Air Batteries

“…Figure f shows the polarization curve of the batteries with different inhibitors. It could be observed that the batteries show a similar activation process at the low-current-density region . The peak power densities of the batteries without and with ZnO and hybrid inhibitors are 49.6, 51.3, and 63.7 mW cm –2 , respectively.…”

“…It could be observed that the batteries show a similar activation process at the low-currentdensity region. 36 The peak power densities of the batteries without and with ZnO and hybrid inhibitors are 49.6, 51.3, and 63.7 mW cm −2 , respectively. However, the peak power density of the batteries with 18 g L −1 AM is 46.3 mW cm −2 (Figure S5d).…”

Growth restriction of Co 3 O 4 nanoparticles by α‐MnO 2 nanorods as air cathode catalyst for rechargeable aluminum‐air battery

“…Metal-air batteries (MABs), with the advantages of low cost, high energy density, large capacity, and less dependence of capacity on workload and temperature, have attracted much attention. [1][2][3][4][5] MABs convert chemical energy into electricity by consuming metals and oxygen in the air, making them an ideal clean energy source. [6][7][8] Thereinto, on account of the high electrochemical equivalent (2.98 Ah/g) and volume-specific energy (8.04 Ah cm À3 ) of aluminum, the aluminum-air battery (AAB) has the actual specific energy of 900 Wh/kg, 9 and the theoretical specific energy of AAB can reach 8100 Wh/kg, 10 which is second only to lithium-air batteries in all MABs.…”

“…Metal‐air batteries (MABs), with the advantages of low cost, high energy density, large capacity, and less dependence of capacity on workload and temperature, have attracted much attention 1‐5 . MABs convert chemical energy into electricity by consuming metals and oxygen in the air, making them an ideal clean energy source 6‐8 .…”

Prediction of solar‐chargeable battery materials: A text‐mining and first‐principles investigation

“…[21][22][23][24][25][26][27][28][29] The photo-battery is a typical example of an integrated solar energy conversion and storage device that utilizes solar energy to power electric vehicles and smart phones. [30][31][32][33][34][35][36][37][38][39] The electric vehicles require fixed charging point to charge the lithium-ion battery, which is detrimental to the portability and endurance of the device; such issues can be solved by the development of the photo-battery materials that help charge the batteries in the electric vehicles remotely via the solar energy. The development of the photo-batteries is beneficial for the Internet-of-Things (IoT) that require individual devices to be powered remotely.…”