We’re being asked to determine which cathode has a higher percentage of lithium and if this explains why LiMn2O4 cathodes deliver less power discharging.
Recall that mass percent is given by the formula:
For the percent by mass Li in LiMn2O4 cathode, the mass percent equation is
For the percent by mass Li in LiCoO2 cathode, the mass percent equation is
We will do the following steps to solve the problem:
Step 1: Calculate the mass of Li, LiMn2O4, LiCoO2
Step 2: Calculate the percent by mass Li in both cathodes
Step 3: Explain the phenomena using mass percent
Li-ion batteries used in automobiles typically use a LiMn2O4 cathode in place of the LiCoO2 cathode found in most Li-ion batteries.
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?
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What scientific concept do you need to know in order to solve this problem?
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