Abstract
Wearable Al-air batteries are regarded as the potential power systems for flexible electronics due to the ultra-high capacity and energy density of Al-based materials. However, the battery failure caused by the accumulation of parasitic product Al(OH)3 upon the anode surface has hindered the commercialization. Herein, we report a polyacrylic acid hydrogel integrating KF and KOH (F@PAA), which decompose Al(OH)3 for ameliorating discharge performance of wearable Al-air battery. The ions channels upon the anode surface are dredged by a competitive attack of F− on Al-O, thus improving the battery durability. The results show that the binding of Al3+ with F− is more stable than that with O2−. The formed complex AlF63− corrodes the passivation layer, and then ensures the continuous anodic oxidation. When 1.0 M F− is introduced into F@PAA hydrogel, the effect of byproduct decomposition and battery discharge are optimal. Hence, A wearable Al-air battery using the proposed hydrogel achieves a maximum power density of 58.28 mW/cm2. A high capacity of 2199.10 mAh/g and anode efficiency of 73.80% for the battery can be obtained at 10 mA/cm2. Moreover, the key performance of the battery is improved by up to 104.08%, developing interface cleaning technology in wearable Al-air batteries.
Published Version
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