Problem: 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?

FREE Expert Solution

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:

mass percent = mass elementtotal mass of compound×100


For the percent by mass Li in LiMn2O4 cathode, the mass percent equation is

% mass Li = mass Limass LiMn2O4×100


For the percent by mass Li in LiCoO2 cathode, the mass percent equation is

% mass Li = mass Limass LiCoO2×100


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 

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Problem Details

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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