疏水铝复合负极的制备及在空气电池中的表征

Preparation of hydrophobic aluminum composite anode and its characterization in alkaline Al-air cell

以铝粉为活性材料,通过添加石墨等中间相,采用机械制备法制备了具有强疏水性的复合铝负极,抑制了负极与水的接触,有效缓冲腐蚀反应。进一步设计、组装了多层结构的铝空气电池,测试了该复合负极在不同水含量的酒精/水混合碱性电解液中的电化学性能。测试表明,相比于铝片,制备得到的疏水性负极反应过程中腐蚀反应得到了较好的控制,极化明显降低,电化学性能明显提升。采用该铝基复合负极的铝空气电池具有约1.6 V 的负极电位,以及稳定的放电特性。

The highly hydrophobic aluminum composite anode was prepared by a mechanical method by using aluminum powder as the active material and graphite as the intermediate phase. The composite can effectively decrease the corrosion reaction by impeding the contract of the anode with water. An aluminum-air cell with multi-layers structure was further designed and fabricated. The electrochemical performance of the composite anode was investigated in the as-designed aluminum-air cell based on alkaline hybrid ethanol/water electrolyte with different water contents. Results show that the corrosion reaction can be highly suppressed for the hydrophobic aluminum composite anode during the anodic process, leading to an obvious decrease on cell polarization and improvement on the electrochemical behavior. The aluminum-air cell based on the as-proposed composite anode shows an anodic potential of about 1.6 V, with a high discharge property.