石墨烯对铝粉烧结式阳极箔的影响研究

Effect of graphene on aluminum powder sintered anode foil

相关研究表明基于铝粉增材制造的烧结式电解电容器阳极箔的理论比容量相比传统腐蚀箔有大幅提升,有望在未来得到普遍应用,但目前铝粉烧结工艺仍有待完善。石墨烯作为二维材料具有超高比表面积的特性,在烧结过程中加入石墨烯有利于铝粉间的接触,从而改善铝粉烧结性能,因此石墨烯在烧结箔领域具有极大的潜在应用价值。分别对铝粉和石墨烯在NMP分散液中的Zeta电位进行了研究,表明二者由于存在较大的电位差且电位相反,因此在铝粉烧结箔的制浆过程中,将石墨烯分散液加入铝粉浆料,可以实现石墨烯对铝粉的均匀包覆;进一步研究了不同石墨烯包覆量对铝粉烧结箔性能的影响,结果表明,设计的制备流程可以使石墨烯与铝粉之间形成良好复合,在质量分数为1.34‰的石墨烯包覆量条件下,阳极箔的CV积提升了17.23%,损耗角正切值降低了5.56%,证明适量石墨烯的添加有利于烧结箔的性能改善。

Relevant research has shown that the theoretical specific capacitance of sintered electrolytic capacitor anode foil based on aluminum powder additive manufacturing is much higher than that of traditional corrosion foil,so the sintered anode foil is expected to be widely used in the future.However,the sintering process of aluminum powder still to be improved.As a two-dimensional material,graphene has ultra-high specific surface area.The addition of graphene during the sintering process is beneficial to the contact among aluminum powders,thus the sintering performance of aluminum powders could be improved.Therefore,graphene has great potential application value in the field of sintered foil.Zeta potential of aluminum powder and graphene in NMP dispersion was studied,respectively.Because of their large potential difference and the opposite potential,the uniform coating of aluminum powder by graphene could be achieved by adding graphene dispersion into aluminum powder slurry during the pulping process of aluminum sintered foil.The effect of different amount of graphene coating on the properties of aluminum sintered foil can be further studied.The result shows that the preparation process could form good combination between graphene and aluminum powder.When the mass fraction of graphene coating is 1.34‰,the CV product of the anode foil can be increased by 17.23%,and the dissipation factor of it can be reduced by 5.56%.It is proved that the addition of proper amount of graphene is beneficial to the improvement of the properties of sintered foil.