Lv Chaonan, Li Yixin, Zhu Yuanxin, Zhang Yuxin, Kuang Jialin, Zhao Qing, Tang Yougen, Wang Haiyan
Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P. R. China.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
Adv Sci (Weinh). 2023 Oct;10(29):e2304214. doi: 10.1002/advs.202304214. Epub 2023 Aug 16.
Aqueous aluminum-air batteries are attracting considerable attention with high theoretical capacity, low-cost and high safety. However, lifespan and safety of the battery are still limited by the inevitable hydrogen evolution reaction on the metal aluminum anode and electrolyte leakage. Herein, for the first time, a clay-based quasi-solid-state electrolyte is proposed to address such issues, which has excellent compatibility and a liquid-like ionic conductivity. The clay with uniform pore channels facilitates aluminum ions uniform stripping and reduces the activity of free H O molecules by reconstructing hydrogen bonds network, thus suppressing the self-corrosion of aluminum anode. As a result, the fabricated aluminum-air battery achieves the highest energy density of 4.56 KWh kg with liquid-like operating voltage of 1.65 V and outstanding specific capacity of 2765 mAh g , superior to those reported aluminum-air batteries. The principle of constructing quasi-solid-state electrolyte using low-cost clay may further promote the commercialization of aluminum-air batteries and provide a new insight into electrolyte design for aqueous energy storage system.
水系铝空气电池因其高理论容量、低成本和高安全性而备受关注。然而，电池的寿命和安全性仍然受到金属铝阳极上不可避免的析氢反应和电解液泄漏的限制。在此，首次提出一种基于粘土的准固态电解质来解决这些问题，该电解质具有优异的兼容性和类液体离子导电性。具有均匀孔道的粘土促进铝离子均匀脱嵌，并通过重建氢键网络降低游离水分子的活性，从而抑制铝阳极的自腐蚀。结果，所制备的铝空气电池实现了4.56 KWh/kg的最高能量密度、1.65 V的类液体工作电压和2765 mAh/g 的出色比容量，优于已报道的铝空气电池。使用低成本粘土构建准固态电解质的原理可能会进一步推动铝空气电池的商业化，并为水系储能系统的电解质设计提供新的思路。
