Storing energy in carbon nanotubes

Figure 6. The electrochemical behavior of carbon SWNTs under galvanostatic cycling is far from ideal. There is a large irreversible capacity (in contrast to graphite); insertion
and removal of lithium ions occur over a wide range of potentials and a large hysteresis between insertion and removal. Nevertheless, the reversible capacity in this system is 25%
larger than in graphite. Some specially treated SWNT materials have more than twice the reversible capacity of graphite.