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We studied the charge and discharge characteristics of commercial LiCoO 2 -based 18650 cells by using various electrochemical methods, including discharging at constant power, ac impedance spectroscopy, and dc-voltage pulse. At 20°C, these cells deliver 8.7–6.8Wh of energy when discharged at a power range of 1–12W between 2.5 and 4.2V. Ragone plots show that the effect of discharge power on...
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