In view of the waste lithium ion batteries increasing, the technologies for recycling and regeneration of spent LiCoO2 batteries have been explored. In this paper, LiNi0.8Co0.1Mn0.1O2 cathode material was re-synthesized from discard LiCoO2 batteries through pre-treatment, acid leaching and co-precipitation. he concentration of metal ion in leachate were analyzed by ICP-OES, the morphology and structure of cathode materials were characterized by the SEM and XRD, the electrochemical properties of coin batteries were performed by the electrochemical tests. The results showed that the regenerated material from acid leaching lixivium exhibits the desired morphology and well layer structure. Under the condition of 2.8~4.3V, the initial discharge capacity of regenerated material is 210.8 mAh/g at 0.2C. After 50 cycles, the capacity retention of re-synthesized cathode material is 87%, showing good cycle performance, which will support the recycling process for spent Li-ion batteries