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F− competitive attack decomposing parasitic product Al(OH)3 of hydrogel-based Al-air battery
Energy Storage Materials ( IF 18.9 ) Pub Date : 2023-05-11 , DOI: 10.1016/j.ensm.2023.102812
Manhui Wei , Keliang Wang , Liping Zhong , Thi Ha My Pham , Yayu Zuo , Hengwei Wang , Pengfei Zhang , Zhuo Chen , Siyuan Zhao , Pucheng Pei

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.



中文翻译:

F−竞争性攻击分解水凝胶基铝空气电池的寄生产物Al(OH)3

由于铝基材料的超高容量和能量密度,可穿戴铝空气电池被认为是柔性电子产品的潜在动力系统。然而,寄生产物Al(OH) 3在阳极表面的积累导致电池失效阻碍了商业化。在此,我们报道了一种结合了 KF 和 KOH 的聚丙烯酸水凝胶 (F@PAA),它可以分解 Al(OH) 3以改善可穿戴铝空气电池的放电性能。F-对Al-O的竞争性攻击疏通了负极表面的离子通道,从而提高了电池的耐久性。结果表明Al 3+与F 的结合比与O 2−的结合更稳定. 形成的络合物AlF 6 3−腐蚀钝化层,进而保证阳极氧化的连续进行。当将1.0 MF -引入到F@PAA水凝胶中时,副产物分解和电池放电的效果最佳。因此,使用所提出的水凝胶的可穿戴铝空气电池实现了 58.28 mW/cm 2的最大功率密度。该电池在10 mA/cm 2时可获得2199.10 mAh/g的高容量和73.80%的负极效率。此外,电池关键性能提升高达104.08%,开发可穿戴铝空气电池界面清洁技术。

更新日期:2023-05-15
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