Razaz Ghadir, Arshadirastabi Shahrzad, Blomquist Nicklas, Örtegren Jonas, Carlberg Torbjörn, Hummelgård Magnus, Olin Håkan
Department of Natural Sciences, Mid Sweden University, 85170 Sundsvall, Sweden.
Materials (Basel). 2023 Jan 18;16(3):933. doi: 10.3390/ma16030933.
Considerable research has been devoted to the development of cathode materials for Al-ion batteries, but challenges remain regarding the behavior of aluminum anodes. Inert oxide (AlO) film on Al surfaces presents a barrier to electrochemical activity. The structure of the oxide film needs to be weakened to facilitate ion transfer during electrochemical activity. This study addresses oxide film challenges by studying Al alloy anodes with different iron content. The results reveal that using an anode of 99% Al 1% Fe in a cell increases the cycling lifetime by 48%, compared to a 99.99% Al anode. The improvement observed with the 99% Al 1% Fe anode is attributed to its fractional surface area corrosion being about 12% larger than that of a 99.99% Al anode. This is coupled to precipitation of a higher number of AlFe particles, which are evenly scattered in the Al matrix of 99% Al 1% Fe. These AlFe particles constitute weak spots in the oxide film for the electrolyte to attack, and access to fresh Al. The addition of iron to an Al anode thus offers a cheap and easy route for targeting the oxide passivating film challenge in Al-ion batteries.
大量研究致力于铝离子电池阴极材料的开发，但铝阳极的性能仍面临挑战。铝表面的惰性氧化膜（AlO）对电化学活性构成了障碍。需要削弱氧化膜的结构，以促进电化学活性过程中的离子转移。本研究通过研究不同铁含量的铝合金阳极来应对氧化膜挑战。结果表明，在电池中使用99%铝1%铁的阳极，与99.99%铝的阳极相比，循环寿命提高了48%。观察到99%铝1%铁阳极的性能提升归因于其比表面积腐蚀比99.99%铝阳极大约大12%。这与大量AlFe颗粒的析出有关，这些颗粒均匀地分散在99%铝1%铁的铝基体中。这些AlFe颗粒构成了氧化膜中的薄弱点，便于电解质攻击并接触到新鲜的铝。因此，在铝阳极中添加铁为解决铝离子电池中氧化膜钝化的挑战提供了一种廉价且简便的途径。
