Yifei Wang , Wending Pan , Kee Wah Leong , Shijing Luo , Xiaolong Zhao , Dennis Y.C. Leung
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引用次数: 9
摘要
水凝胶电解质特别适用于针对各种便携式应用的固态铝-空气电池,然而,这可能会在电池待机期间导致持续的铝腐蚀。为了解决这个问题,本工作首次开发了一种用于铝-空气电池的乙醇凝胶电解质,使用KOH作为溶质,聚环氧乙烷作为胶凝剂。与水凝胶相比,乙醇凝胶可以有效地抑制铝的腐蚀,从而稳定地储存铝。当组装到铝-空气电池中时,乙醇凝胶电解质的放电寿命和比容量大大提高,在0.1 mA cm−2时分别是水凝胶电解质的5.3倍和4.1倍。通过研究凝胶性质,发现较低的乙醇纯度可以提高电池的功率输出,但代价是降低放电效率。相反,较高的聚合物浓度会降低功率输出,但会给放电效率带来额外的好处。至于凝胶厚度,1mm的中等值是优选的,以平衡功率输出和能量效率。最后,为了满足日益增长的柔性电子产品市场,通过将乙醇凝胶浸渍到纸基板中,开发了一种柔性铝-空气电池,即使在严重变形或损坏的情况下也能正常工作。
Solid-state Al-air battery with an ethanol gel electrolyte
Hydrogel electrolyte is especially suitable for solid-state Al-air batteries targeted for various portable applications, which may, however, lead to continuous Al corrosion during battery standby. To tackle this issue, an ethanol gel electrolyte is developed for Al-air battery for the first time in this work, by using KOH as solute and polyethylene oxide as gelling agent. The ethanol gel is found to effectively inhibit Al corrosion compared with the water gel counterpart, leading to stable Al storage. When assembled into an Al-air battery, the ethanol gel electrolyte achieves a much improved discharge lifetime and specific capacity, which are 5.3 and 4.1 times of the water gel electrolyte at 0.1 mA cm−2, respectively. By studying the gel properties, it is found that a lower ethanol purity can improve the battery power output, but at the price of decreased discharge efficiency. On the contrary, a higher polymer concentration will decrease the power output, but can bring extra benefit to the discharge efficiency. As for the gel thickness, a moderate value of 1 mm is preferred to balance the power output and energy efficiency. Finally, to cater the increasing market of flexible electronics, a flexible Al-air battery is developed by impregnating the ethanol gel into a paper substrate, which can function normally even under serious deformation or damage.
期刊介绍:
Green Energy & Environment (GEE) is an internationally recognized journal that undergoes a rigorous peer-review process. It focuses on interdisciplinary research related to green energy and the environment, covering a wide range of topics including biofuel and bioenergy, energy storage and networks, catalysis for sustainable processes, and materials for energy and the environment. GEE has a broad scope and encourages the submission of original and innovative research in both fundamental and engineering fields. Additionally, GEE serves as a platform for discussions, summaries, reviews, and previews of the impact of green energy on the eco-environment.