Indigo Dye as a Positive-electrode Material for Rechargeable Lithium Batteries

The performance of indigo carmine (5,5'-indigodisulfonic acid sodium salt) as a positive-electrode material for rechargeable lithium batteries was investigated. The prepared electrode showed an initial discharge capacity of 110 mA h g(-1), which corresponds to two-electron-redox behavior. Furthermore, the electrode was shown to have good cycle-life stability.