Preparation and electrochemical properties of re-synthesized LiCoO2 from spent lithium-ion batteries |
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| Authors: | Li Li RenJie Chen XiaoXiao Zhang Feng Wu Jing Ge Man Xie |
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| Institution: | 1. School of Chemical Engineering and Environment, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China
2. National Development Center for High Technology Green Materials, Beijing, 100081, China
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| Abstract: | 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. |
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| Keywords: | spent lithium-ion batteries lithium cobalt oxide sol-gel recycling |
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