A nanocrystalline Co 3O 4 thin film electrode for Li-ion batteries

Abstract

Thin films of nanocrystalline Co 3O 4 have been prepared by reactive pulsed laser deposition (PLD) method in oxygen ambient. The film electrode of Co 3O 4 has a reversible capacity of 1000 mAh/g and its capacity fading is less than 0.2% per cycle at a discharge of 3 C. X-Ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photo-electron spectroscopy (XPS) measurements demonstrated that the deposited films composed of cubic spinel Co 3O 4 with the mean size of ∼50 nm. The nano-sized structure of the Co 3O 4 plays an important role in the superior reversible capacity and good cycling performance. Our results also demonstrate the promise of pulsed laser deposition for the fabrication of nanocrystalline Co 3O 4 film for all-solid-state thin film rechargeable lithium batteries.