Climate Tech Reporter David Roberts discusses battery recycling with ceo of a company that is working on scaling up a newer fossil fuel free method of melting down and separating battery metals. This method has advantages of not burning up most of the valuables and sending them into the open atmosphere as well as not requiring a constant stream of harsh chemical feed, or having chemical waste.
Today his small scale plant is handling mostly the waste from faulty primary manufacturing, and is looking to scale up in time for the 2030 boom in lithium battery recycling.
It's the battery processing that is improved with this process. And im not really sure what you're getting at, but the energy density of lithium ion is king at the moment