There was a lot of hope in the '00's that we'd see another revolution from LIon the way we did from NiMH and NiCD before that, but it just never happened.<p>Everyone was projecting out electric cars and busses and planes and such based on a similar uptick.<p>Although, if we're really honest, there's a kind of Moore's Law of battery improvement and it's something like 6% a year, so that's a doubling every 12 years. Every new tech that swamps that performance curve also has extremely high manufacturing costs, poor yields, or both. You could almost predict when (if ever) they would become commercially viable by figuring out where the price/performance lines crossed. If anyone tried to accelerate that crossover point they did it by reducing the performance of the product to make it cheaper to build or more reliable.<p>For example, thicker membranes reduce specific energy but might be easier or safer to build.