A hybrid organic-inorganic nanocomposite useful as a cathode in high discharge capacity lithium batteries is provided. The nanocomposite includes macromolecules that are located inside interlayer galleries of V2O5. These macromolecules include either conducting conjugated polymers or a combination of conducting conjugated polymers and ion conducting polymers. The nanocomposites possess high charge/discharge characteristics. A solvent-free mechanochemical method for the preparation of the hybrid organic-inorganic nanocomposites is also provided.