Re: When can I get it?: 2025
Actually, there's been a phenomenal amount of R&D going on for years now, initially driven by phone and tablet needs, not looking at cars and grid scale storage. Last year for which I saw data, the ten largest patentees of battery technology had pocketed over 40,000 patents between them. Obviously that doesn't mean the patents are worth anything, just an indicator of how much research is and has been underway.
Sadly, it's typically seven years from breakthrough in the lab to mass market product, because the lab breakthrough merely shows that something works there. At that point the technology doesn't have any supply chain, any manufacturing experience, or any products designed around them, and these take time to get in place (IP legal work, design work, contractual legals, safety testing & certifcation, manufacturing construction, battery manufacture and device manufacture and marketing). I anything, seven years is incredibly fast....
Even if that could be done in a third of the time, no sane person would risk a mass roll out of a product not proven at smaller scale - even if the battery is provably safe, there's huge commercial risks of real world durability, performance and economics. And sadly there's typically another seven to ten years to completely optimise a given chemistry or major tech break through. So at launch a new battery chemistry will typically be at around 40% of its theoretical potential (based on chemistry), but that can be steadily increased over time, and if you're lucky and invest enough in R&D, you might get that to 80% before something else comes along to replace it.
All of which assumes no technology or cost roadblocks are discovered on the journey to commercialisation, and that other more promising technologies don't appear that research funders choose to back instead.