Performance Research and Optimization of Cotton-Based Aluminum-Air Battery Adopting Double-Face Anode
摘要
A passive aluminum-air battery (AAB) employing a cotton material as the electrolyte channel is developed for its potential use in microelectronics. Unlike conventional single-face anode designs, which utilize the one face of the aluminum anode and thus limit AAB performance, a double-face anode AAB (DF-AAB) is constructed to improve the compactness and power output of the battery. The DF-AAB exhibits the lowest internal resistance and highest performance among the single-face anode AAB (SF-AAB), DF-AAB, and SF-AAB stack. The DF-AAB is further optimized by adjusting KOH concentrations and selecting cotton materials as the flow channel and absorbent pad. With 8 mol L−1 KOH and medical gauze as the flow channel and absorbent pad, the DF-AAB shows a peak power of 135.2 ± 3.6 mW and a limiting current of 505.6 ± 18.4 mA. The corresponding maximum power density and limiting current density of the DF-AAB are 67.6 ± 1.8 mW cm−2 and 252.8 ± 9.2 mA cm−2, based on the total active area (2 cm2) of the two anode faces. The stack composed of the two DF-AABs connected in series demonstrates practical application by powering 82 light-emitting diodes (LEDs) and a calculator.