1. Which material has a higher percentage of lithium? 2. Does this help to expla
ID: 932719 • Letter: 1
Question
1. Which material has a higher percentage of lithium?
2. Does this help to explain why batteries made with LiMn2O4 cathodes deliver less power on discharging?
Match the words in the column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete.
LiCoO2
less
LiMn2O4
anode
doesn't explain
Li+
graphite
more
definitely explains
O2
cathode
1. _________ has almost twice as great a mass percent Li as ________.
2. This __________ why LiMn2O4 cathodes deliver less power on discharging. A Li-ion battery produces power by the migration of __________ , but not all the_________ in the_________ material migrates during a full charge. The greater percentage of Li in the_________ material, the more _________ that migrates and the ________ power can be produced upon discharge.
LiCoO2
less
LiMn2O4
anode
doesn't explain
Li+
graphite
more
definitely explains
O2
cathode
1. _________ has almost twice as great a mass percent Li as ________.
2. This __________ why LiMn2O4 cathodes deliver less power on discharging. A Li-ion battery produces power by the migration of __________ , but not all the_________ in the_________ material migrates during a full charge. The greater percentage of Li in the_________ material, the more _________ that migrates and the ________ power can be produced upon discharge.
Explanation / Answer
1. Which material has a higher percentage of lithium?
LiCoO2; LiMn2O4
First, find MW of each
LiCoO2; 97.87
LiMn2O4 180.813
Since there is 1 mol of Li in each sample, then, the lower mass sample will have higher % of Lithium
Q2. Does this help to explain why batteries made with LiMn2O4 cathodes deliver less power on discharging?
2. This definetively explains why LiMn2O4 cathodes deliver less power on discharging. A Li-ion battery produces power by the migration of LI+, but not all the Li+ in the cathode material migrates during a full charge. The greater percentage of Li in the cathode material, the more Li+ that migrates and the more power can be produced upon discharge.
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