Scientists may have an explanation for why some batteries don’t last

 

Researchers may have found the answer to a long-standing mystery regarding the gradual degradation of certain lithium-ion batteries. According to recent studies, a significant contributor to battery aging may be hydrogen atoms rather than only lithium ions. Hydrogen protons from the electrolyte eventually find their way into the cathode of the battery, where they obstruct the free flow of lithium. Shorter battery life results from this interaction since it reduces the battery's capacity to retain a charge even when not in use.

In controlled trials, the Stanford University study team used deuterium, a heavier hydrogen isotope, to measure the migration of these hydrogen atoms. They were able to see how the accumulation of hydrogen in the battery causes chemical processes that lower its capacity. Due to their propensity to draw additional hydrogen accumulation, high-voltage batteries—which are necessary for systems that require long-lasting energy—seem especially susceptible to this problem. Future battery designs may be guided by the findings to reduce these hydrogen reactions, perhaps producing more robust and effective batteries for gadgets and electric cars.

These results are important because removing this hydrogen accumulation may help batteries become more sustainable by lowering the frequency of replacements and so lowering the need for components that are high in resources, such as lithium and cobalt. To find out if these findings hold true for different battery kinds and situations, researchers point out that more research is necessary.