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Why should the electrolyte for Li-ion batteries contain lithium cations

Why should the electrolyte for Li-ion batteries contain lithium cations

This is because the lithium cations in the electrolyte assist in the transport of Li-ions. When the cell is operating (say charging), the electric field is such that some of the Li-ions in the electrolyte move towards the anode before being replaced by the ones from the cathode. All these begin very quickly after the double layer is formed. Also, if a different cation is employed, the charge density of that cation might induce repulsive forces that will counteract the lithium-ion mobility or force an electrochemical reaction among the two.

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