Research on the Performance of the Cotton‐Based Al‐Air Battery with the Tilt Angle

Abstract The passive cotton‐based Al‐air battery adopts the cotton cloth as the flow channel to transport the electrolyte by the capillary force from the cloth. An absorbent pad is usually put at the end of the cotton cloth to keep the electrolyte continuously flowing. Once the absorbent pad is saturated, the electrolyte flow slows down or even stops. This can affect the transportation of the electrolyte and product, decreasing the battery performance. To maintain the electrolyte's continuous flow, the cotton‐based Al‐air battery with the tilt angle was presented and constructed. The effects of the catalyst loadings, tilt angles, electrolyte types, and area ratios on this battery were studied. Under the 4 mg cm −2 carbon catalyst loading, 10° tilt angle, 4 mol L −1 KOH electrolyte, and anode‐to‐cathode area ratio of 1 : 3, this battery performance was optimal, with the peak power density of 78.09±0.68 mW cm −2 and limiting current density of 213.12±0.80 mA cm −2 . Finally, the battery stack was gained by connecting the two batteries with the 10° tilt angle in series. This stack with a peak power of 48.47±0.37 mW could light the 44 LEDs.