No big deal just stuff a bunch of lithium (or your fav ion) in a battery. 2X the amount per battery and you go twice as far. Easy right?
Tesla baby steps with Si anodes seem a struggle
https://www.msn.com/en-us/news/scienceandtechnology/austin-we-have-a-problem-tesla-descends-into-battery-hell/ar-AA1lQgFU?ocid=sapphireappshare
I say keep at it. Cost will fall range will grow.