A group of Spanish scientists is developing a revolutionary sodium-sulfur battery

A team of researchers from the University of Córdoba has developed an innovative battery that promises to revolutionise the field of energy storage. This battery, based on sodium and sulphur, has been shown to withstand more than 2,000 full charge cycles, far exceeding the capabilities of traditional lithium-ion batteries in that respect.

According to these researchers, sulphur has been used in the cathode to replace other commonly used toxic metals, while the lithium in the anode has been replaced by sodium, a far more abundant, accessible and cheaper element. Although it is true that the combination of sodium and sulphur had already been used in other batteries, those batteries had the drawback of only working at extremely high temperatures, whereas the ones developed by this team of Spanish scientists can work perfectly well at room temperature.

The incorporation of an iron-based metal-organic framework (MOF) in the cathode is what sets these sodium-sulphur batteries apart from others with the same chemical composition, as this structure facilitates the movement of sodium ions, allowing the battery to be charged and discharged repeatedly without any noticeable degradation of its performance.

In real-world use, these batteries would represent a significant leap forward

To put this into perspective, if an electric vehicle’s battery is charged on average a couple of times a week, these batteries, capable of withstanding more than 2,000 charge cycles, could have a useful life of almost 20 years. However, not everything is advantageous, and the researchers themselves acknowledge that there are still some aspects to improve, such as charging time, which currently stands at one hour.

It therefore does not seem that we will be seeing these sodium-sulphur batteries in any mass-produced vehicle soon, but it is nonetheless an important advance and a step in the right direction in improving battery technology, which will sooner or later benefit electric vehicle drivers.