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# Determining Energy Density of a Battery System

CHEM-Y4ICXE

Lithium ion batteries are lightweight rechargeable batteries. Consider the reduction half reaction below for the cathodic reaction.

$$\textrm{MnO}_{2(s)}+ \textrm{Li}^+_{(aq)}+e^-\rightarrow \textrm{LiMnO}_{2(s)}$$

Determine the specific energy density of this substance (in the units $\frac{\textrm{mA h}}{\textrm{g}}$).

A

$285.6$

B

$308.5$

C

$1028$

D

$1111$

E

$3886$