The start-ups hoping to return battery making to the US

"We have requests coming from Spain, France, Germany, The Netherlands."

— Darren Tan , Executive

"If you're going to go for sodium […] and you're going to sell safety, then don't start putting elements in that are going to raise red flags."

— Prof Dame Clare Grey , Academic

"Safety tests reported on the cell chemistry are very promising."

— Ivana Hasa , Academic

"We've tried very hard to try and produce it, we've overcharged it as much as we can... We were unsuccessful in generating chromium-6."

— Darren Tan , Executive