Preparation and electrochemical performance of Li-rich layered cathode material,Li[Ni0.2Li0.2Mn0.6]O2, for lithium-ion batteries |
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Authors: | Feng Wu Huaquan Lu Yuefeng Su Ning Li Liying Bao Shi Chen |
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Affiliation: | (1) School of Chemical Engineering and Environment, Beijing Institute of Technology, 100081 Beijing, China;(2) National Development Center of High Technology Green Materials, 100081 Beijing, China; |
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Abstract: | The Li-rich layered cathode material, Li[Ni0.2Li0.2Mn0.6]O2, was synthesized via a “mixed oxalate” method, and its structural and electrochemical properties were compared with the same material synthesized by the sol–gel method. X-ray diffraction (XRD) shows that the synthesized powders have a layered O3–LiCoO2-type structure with the R-3m symmetry. X-ray photoelectron spectroscopy (XPS) indicates that in the above material, Ni and Mn exist in the oxidation states of +2 and +4, respectively. The layered material exhibits an excellent electrochemical performance. Its discharge capacity increases gradually from the initial value of 228 mA hg−1 to a stable capacity of over 260 mA hg−1 after the 10th cycle. It delivers a larger capacity of 258 mA hg−1 at the 30th cycle. The dQ/dV curves suggest that the increasing capacity results from the redox-reaction of Mn4+/Mn3+. |
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