近期实验室李思萍同学、李刚勇老师在可充电铝电池领域取得了重大突破，通过使用乙炔黑改性分离器（AB/GF/A）成功改善了过渡金属硒化物（TMSs）在循环过程中的电化学性能。制备的可充电铝铜硒电池表现出令人瞩目的电化学性能。通过结合电化学测试以及原位光谱和电子显微镜表征，研究团队发现溶解的铜和硒在AB/GF/A表面形成的物种仍然保持电活性，这抑制了穿梭效应并提高了反应动力学，实现了Cu2Se的扩散控制机制表面伪电流控制行为。这一研究深入了解了功能化分离器在TMSs系统中的储能机理，为未来进一步研究提供了重要的参考。
Transition metal selenides (TMSs) become one of the most promising cathode materials for rechargeable aluminum batteries (RABs) due to the advantages of high specific capacity, low cost, and simple preparation process. However, TMSs are soluble in the acidic chloroaluminate ionic liquid electrolyte during cycling, leading to undesirable electrochemical performance. Herein, rechargeable Al-Cu2Se batteries are fabricated with acetylene black modified separator (AB/GF/A) showing excellent electrochemical performance with capacity retention of 95 mAh g−1 after 5000 cycles at 0.5 A g−1 and 166.1 mAh g−1 at 1.0 A g−1 . By combining electrochemical tests and ex situ spectroscopy and electronic microscope characterizations, it is revealed that the dissolved Cu and Se species adsorbed on the surface of AB/GF/A still remain electroactivity, which transforms the diffusion-controlled mechanism of Cu2Se to surface pseudocapacitance-controlled behavior, thus suppressing the shuttle effects and boosting the reaction kinetics. The in-depth understanding of the functionalized separator in energy storage mechanism of TMSs could provide reference for further progress of RABs in the future work.
论文题目：Achieving long-cycling life rechargeable aluminum batteries with a Cu2Se cathode enabled by a carbon-functionalized separator
论文作者：Siping Li , Gangyong Li , Zhi Li , Wenyuan Xu , Liang Chen , Wei Wang , Binhong He , Minjie Zhou , Zhaohui Hou.
