Lei Haiping, Li Suqin, Tu Jiguo
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing Beijing 100083 PR China
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing Beijing 100083 PR China.
RSC Adv. 2021 Dec 13;11(62):39484-39492. doi: 10.1039/d1ra08067a. eCollection 2021 Dec 6.
The current aluminum batteries with selenium positive electrodes have been suffering from dramatic capacity loss owing to the dissolution of SeCl products on the Se positive electrodes in the ionic liquid electrolyte. For addressing this critical issue and achieving better electrochemical performances of rechargeable aluminum-selenium batteries, here a gel-polymer electrolyte which has a stable and strongly integrated electrode/electrolyte interface was adopted. Quite intriguingly, such a gel-polymer electrolyte enables the solid-state aluminum-selenium battery to present a lower self-discharge and obvious discharging platforms. Meanwhile, the discharge capacity of the aluminum-selenium battery with a gel-polymer electrolyte is initially 386 mA h g (267 mA h g in ionic liquid electrolyte), which attenuates to 79 mA h g (32 mA h g in ionic liquid electrolyte) after 100 cycles at a current density of 200 mA g. The results suggest that the employment of a gel-polymer electrolyte can provide an effective route to improve the performance of aluminum-selenium batteries in the first few cycles.
目前采用硒正极的铝电池，由于离子液体电解质中硒正极上的SeCl产物溶解，一直存在严重的容量损失问题。为了解决这一关键问题并实现可充电铝硒电池更好的电化学性能，本文采用了一种具有稳定且紧密结合的电极/电解质界面的凝胶聚合物电解质。非常有趣的是，这种凝胶聚合物电解质使固态铝硒电池具有较低的自放电率和明显的放电平台。同时，采用凝胶聚合物电解质的铝硒电池的放电容量初始为386 mA h g（在离子液体电解质中为267 mA h g），在200 mA g的电流密度下循环100次后衰减至79 mA h g（在离子液体电解质中为32 mA h g）。结果表明，使用凝胶聚合物电解质可以为在最初几个循环中提高铝硒电池的性能提供一条有效途径。
