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Lithium-ion batteries are also used in smartphones.

lithium cobalt oxide. The negative electrode is made

from carbon. The electrodes are separated by a very

thin piece of plastic. This plastic allows the positive and

negative particles to pass through. But it also keeps the

two electrodes separated.

There are many benefits to lithium-ion batteries.

They are lighter than other batteries of the same size.

This is important in electric cars. Heavier cars take more

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