290 Electrochemically Enabled Sustainability
axis in the ‘a and b’ direction are brought, coincidentally, exactly one carbon on
top of other, which results in the lithium atom occupying the middle position
between the top six and bottom six carbon atoms. This gives the coordination
conguration LiC
12
. In the stage-1 material (Li
1.0
C
6
), every middle position is
occupied by carbon, whereas in the stage-2 material (Li
0.5
C
6
), every alternate
lithium position is occupied. During stage-2 of lithiation, the inter-layer dis-
tance increases by a small factor, and again during stage-1 of lithiation, the
distance increases by another small factor. These stages are identied with
the help of slow scan cyclic voltammetry or by differentiating the slow