Matter and Interactions
4th Edition
ISBN: 9781118875865
Author: Ruth W. Chabay, Bruce A. Sherwood
Publisher: WILEY
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Textbook Question
Chapter 19, Problem 2Q
How is the charging time for a capacitor correlated with the initial current? That is, if the initial current is bigger, is the charging time longer, shorter, or the same? Explain briefly.
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The following graph represents the charge-discharge profile of a Li-ion battery in the 1st and 50th cycles, cycled at a rate of 0.1 C (1C = 274 mA h g-1 ) in the voltage range of 3.0 to 4.6 V. The battery is made up of LiCoO2 cathode and Li anode. Answer the following questions.
a. What is the value of charge-discharge current density in this case? How long does it take for this battery to discharge from 4.6 V to 3.0 V in 50th cycle?
b. Calculate Coulombic efficiency at 1st and 50th cycles. Why are these values different?
c. How would this graph look like if LiCoO2 and Li were replaced by MnO2 and graphite electrodes respectively Make a rough sketch.
d. Mention any two practical disadvantages of this battery?
In the figure, does the graph indicate the time constant is shorter for discharging than for charging? Would you expect ionized gas to have low resistance? How would you adjust R to get a longer time between flashes? Would adjusting R affect the discharge time?
Please help:
Pacemakers designed for long-term use commonly employ a lithium-iodide battery capable of supplying 0.42 A•h of charge
(A) How many coulombs of charge can such a battery supply? Express your answer using two significant figures
(B) If the average current produced by the pacemaker is 5.6 micro Amps, what is the expected lifetime of the device? Express answer using two significant figures
Chapter 19 Solutions
Matter and Interactions
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