Lithium intercalation (IMAGE)
Caption
Lithium intercalation is the process by which lithium ions insert themselves into the solid electrode of a lithium-ion battery. MIT researchers have shown that as lithium ions (green) move from an electrolyte solution (right) to a cobalt oxide electrode (left), electrons also move into the electrode and reduce the cobalt (gray atoms with gold halo).
Credit
MIT
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CC BY-ND