基于增材制造的铝粉电极箔的比容预测

Theoretical prediction of specific capacitance of aluminum powder electrode foil based on additive manufacturing

传统腐蚀箔的扩面倍率已接近理论极限,工业上化成箔比容量的增长几乎停滞,并且腐蚀过程会产生大量含有金属离子的酸性废液。本文基于增材制造的思想,提出了一种铝粉烧结电极箔的新制造方法。该法使用高纯铝粉和光铝箔为主要原料,通过铝粉层在铝箔上的堆叠、烧结等过程形成一个三维的导电网络,从而提升电极箔表面积。根据铝粉简立方堆积模型,在三个假设的基础上进行了理论比容量的计算,并根据铝粉烧结过程中发生的形变对计算结果进行了修正。修正后结果表明,在球冠接触角度θ=60°时,以半径1μm的铝粉为原料,在400 V的化成电压下,电极箔的理论比容量相比于传统工艺生产的腐蚀箔化成箔有40%以上的提升,表现出了非常好的应用前景。

The expansion ratio of traditionally corroded foil is close to its theoretical limit,and the growth of the specific capacitance of the formed foil is thus almost stagnant in industry.The corrosion process also produces a large amount of liquid acidic waste containing metal ions.Based on additive manufacturing,a new manufacturing method was proposed to make aluminum powder sintered electrode foil.Using high-purity aluminum powder and smooth aluminum foil as the main raw materials,a three-dimensional conductive network was formed by stacking and sintering the aluminum powder layer on the aluminum foil,which increased the surface area of the electrode foil.Based on the simple cubic structure model was aluminum powder,the theoretical specific capacitance was calculated on the basis of three assumptions.The calculated results were also revised according to the deformation of aluminum powder during sintering.The revised results show that when aluminum powder with radius of 1μm is used as the raw material and the contact angleθof spherical cap is 60°,the theoretical specific capacitance at the formation voltage of 400 V is 40%higher than the corrosion foil produced by the traditional process,which shows a very good application prospect.