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Often called “white gold” and the key component in rechargeable batteries, the metal lithium is so light that it floats on water, but its price has sunk like a stone over the past year.

Among the many types of rechargeable batteries, Li-ion batteries are among the most powerful and widely used ones.

Nowadays, rechargeable electric toothbrushes are increasingly popular because they make brushing easier and more effective, but they are a headache when they stop working properly.

Most rechargeable batteries require cobalt, which is toxic to touch and breathe.

The pursuit of greener energy also requires efficient rechargeable batteries to store that energy.