Lithium-ion batteries are rechargeable batteries that rely on lithium ions moving between the positive and negative electrodes to work. In the process of charging and discharging, Li+ is inserted and deembedded back and forth between the two electrodes. When the battery is charged, Li+ is removed from the positive electrode and embedded into the negative electrode through the electrolyte. The negative electrode is in the state of rich lithium. The opposite is true with discharge.
Lithium-ion batteries are easily confused with the following two types of batteries:
(1) Lithium battery: the existence of lithium.
(2) Lithium-ion polymer batteries: replace liquid organic solvents with polymers.