A new idea for reuse of the cathode materials of lithium-ion batteries(LIBs) is investigated to develop an environmentally friend-ly process for recycling spent batteries.LiCoO2 is re-synthesized from spent LIBs by leaching and a sol-gel method calcined at high temperature.Thermogravimetric analysis(TGA) and differential scanning calorimetry(DSC) are employed to study the re-actions occurring calcination that are responsible for the weight losses.X-ray diffraction(XRD) and scanning electron microscopy(SEM) are used to determine the structures of the LiCoO2 powders.It was found that a pure phase of LiCoO2 can be obtained by the re-synthesis process.Cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) are used to evaluate the electrochemical properties of the LiCoO2 powders.The discharge capacity of re-synthesized LiCoO2 is 137 mAh g-1 at the 0.1 C rate,and the capacity retention of the re-synthesized LiCoO2 is 97.98% after 20 cycles at the 0.1 C rate,and 88.14% after 40 cy-cles.The results indicate that the re-synthesized LiCoO2 displays good charge/discharge performance and cycling behavior.
LI LiCHEN RenJieZHANG XiaoXiaoWU FengGE JingXIE Man
