https://www.cnet.com/roadshow/news/panasonic-lithium-ion-battery-cobalt-tesla/

Panasonic, aka Tesla's exclusive battery manufacturer, has already managed to fine-tune its battery chemistry so that cobalt makes up only around 10 percent of the total, but apparently that's not good enough. According to Automotive News, Panasonic seeks to cut that number in half.

Cobalt mining is hard, dangerous work and prices for the rare mineral are going up.