In this study,uniform Co3O4 nanoparticles are prepared via a simple and facile hydrothermal synthesis without calcination treatment.When the Co3O4 nanomaterials are investigated as anodes for lithium ion batteries,a good electrochemical property is achieved.Particularly,the reversible capacity of the as-synthesized Co3O4 nanoparticle has a significant growth from 383 mAh g-1 of the initial cycle to 471 mAh g-1 of the 300th cycle at 2 A g-1.Moreover,when it recovers to 50 mA g-1 after different current densities,a superior reversible capacity of 695 mAh g-1 can be reached.Such favorable electrochemical properties will make the as-obtained Co3O4 have a good application prospect as anode material for lithium ion batteries.