A lithium cobalt oxide (LCO) electrode film composed of 90 wt.% active material, 5 wt.% conductive carbon and 5 wt.% binder by weight is coated onto Aluminum foil current collector. Areal mass loading of the electrode film is 12 mg/cm 2 . Areal weight of aluminum foil is 6 mg/cm 2.

1. (10 pts) Assuming the only 50 % of lithium ions in LCO (theoretical capacity: 275 mAh/g of LCO) is utilized, what is expected capacity normalized by the weight of electrode (mAh/g of electrode)?

2. (10 pts) The LCO electrode in Problem 1 is cut into a disc with diameter of 1 cm. What is the areal capacity (mAh/cm 2 ) of the electrode?

3. (10 pts) The thickness of the LCO disc electrode in Problem 2 is 60 m. What is the volume of the electrode film disc (excluding the thickness of the aluminum foil)?

4. (10 pts) Density of LCO, conductive carbon and binder used for the LCO electrode in Problem 3 are 4.79 g/cm 3, 1.8 g/cm 3 , and 1.78 g/cm 3, respectively. Estimate the theoretical volume of the electrode film with consideration of their weight fraction and areal mass loading given above. Ignore the current collector.

5. (10 pts) What is the porosity (%) of the electrode in Problem 3? The porosity can be obtained by comparing the measured volume of the electrode film and theoretical volume of the electrode film. Ignore the current collector.