When the battery is discharging (operating) Li^+ ions move out of the anode and

Question

When the battery is discharging (operating) Li^+ ions move out of the anode and migrate through the electrolyte where they enter the spaces between the cobalt oxide layers, reducing the cobalt ions. To recharge the battery, electrical energy is used to drive the Li^+ back to the anode, oxidizing the cobalt ions in the cathode. When a Li-ion battery is fully discharged the cathode has an empirical formula of LiCoO2. What is the oxidation number of cobalt in this state? Express your answer as a signed integer. Does the oxidation number of the cobalt increase or decrease as the battery charges?

Explanation / Answer

FROM the formula

LiCoO2 = Li+ CoO2^-

O.N. OF Co + 2 X O.N.of O = -1

O.N. OF Co = -1 + 4

= +3

ANSWER IS + 3

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