即将到来的能源转型不仅需要可再生能源,还需要电池等新型电力存储系统。尽管锂离子电池是主要的存储系统,其他电池已被提议满足安全要求,成本,和资源可用性。远离锂,材料如钠,镁,锌,和钙正在被考虑。水基电解质以其改进的安全性而闻名,环境友好,和负担能力。钥匙,然而,是如何利用负金属电极,例如,使用具有这些金属的水基电解质成为关于氧化和/或枝晶形成的问题。这项工作研究了镁,我们的目的是确定它是否可以与藻酸盐基添加剂电化学沉积在水溶液中以保护镁。为了做到这一点,原子力显微镜用于通过使用探针-悬臂的尖端-作为有源电极来研究局部尺度上镁沉积的形态结构,在充电和放电过程中。使用AFM探针技术进行镁沉积和剥离的第二个目标是我们先前研究的扩展,对于锂,是否可以测量离子电流并在局部范围内进行非法拉第阻抗测量。这里介绍的工作表明,这是可能的,在一个相对简单的方式,因为,镁,没有枝晶形成,这阻碍了剥离过程。
The upcoming energy transition requires not only renewable energy sources but also novel electricity storage systems such as batteries. Despite Li-ion batteries being the main storage systems, other batteries have been proposed to fulfil the requirements on safety, costs, and resource availability. Moving away from lithium, materials such as sodium, magnesium, zinc, and calcium are being considered. Water-based electrolytes are known for their improved safety, environmentally friendliness, and affordability. The key, however, is how to utilize the negative metal electrode, as using water-based electrolytes with these metals becomes an issue with respect to oxidation and/or dendrite formation. This work studied magnesium, where we aimed to determine if it can be electrochemically deposited in aqueous solutions with alginate-based additives to protect the magnesium. In order to do so, atomic force microscopy was used to research the morphological structure of magnesium deposition at the local scale by using a probe-the tip of a cantilever-as the active electrode, during charging and discharging. The second goal of using the AFM probe technology for magnesium deposition and stripping was an extension of our previous study in which we investigated, for lithium, whether it is possible to measure ion current and perform nonfaradaic impedance measurements at the local scale. The work presented here shows that this is possible in a relatively simple way because, with magnesium, no dendrite formation occurs, which hinders the stripping process.