Descobriram por que a bateria do futuro racha por dentro

Your phone has a battery with liquid inside. The liquid can catch fire. So companies want a battery with a hard part instead, a kind of ceramic. This new battery is safer and it lasts longer.

But there is a problem. Small threads of metal grow inside the ceramic. They break it, and then the battery dies in a short circuit. For ten years, nobody knows exactly how. Two teams of scientists defend two different answers.

Now a team in Germany looks at the crack very closely, in a very cold machine. And they see the answer. The metal enters a tiny crack. It cannot move, so it pushes very hard on the walls. The ceramic breaks by pressure, like ice breaking a bottle. Now engineers know what to fix.