What emerging technologies or research areas are currently showing the most promise for energy storage?

I've been reading a lot about energy storage lately and how crucial it is for the future of renewable energy and sustainability. I'm curious, with all the advancements in technology happening so quickly, what emerging technologies or research areas are showing the most promise for the future of energy storage? Specifically, are there any innovative breakthroughs or exciting developments that you think could really revolutionise the way we store energy? I'd love to hear about any cutting-edge research or new approaches that are on the horizon!