Abstract
Manganese dioxide (MnO2) nanomaterials and manganese dioxide/carbon nanotubes (MnO2/CNTs) nanocomposites were prepared by chemical precipitation and hydrothermal methods with Mn2+ and MnO4 − as reactants, respectively. The crystalline structure and morphology of all samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Different crystalline structures and morphologies of MnO2 were prepared by different synthesis methods. Thermogravimetric analysis (TGA) and Elemental analysis (EA) were used to measure the thermal stability and carbon content of MnO2/CNTs nanocomposites. Charge-discharge performance, cyclic voltammetry (CV), large-rate capability performances, and electrochemical impedance spectroscopy (EIS) of the samples were measured as the cathode active materials for lithium ion batteries (LIBs). The synthetic methods and the addition of CNTs have much influence on the electrochemical performance of the products. The δ-MnO2 and δ-MnO2/CNTs prepared by chemical precipitation depict the lower reversible capacities at a current density of 1 C (308 mA g−1). The γ-MnO2 and γ-MnO2/CNTs nanocomposites prepared by hydrothermal method exhibit higher initial capacities of 168 and 254 mAh g−1 and reversible capacities of 85 and 150 mAh g−1, respectively. An enhanced cycling stability for 200 cycles is also achieved. The results show that the addition of CNTs into material can improve the material property at a certain extent.
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Acknowledgments
This work was financially supported by the opening project of key laboratory of optoelectronic chemical material and devices (Jianghan University), Ministry of Education (JDGD-201508) and State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology (GCTKF2014013).
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Luo, S., Xu, S., Zhang, Y. et al. Preparation of MnO2 and MnO2/carbon nanotubes nanocomposites with improved electrochemical performance for lithium ion batteries. J Solid State Electrochem 20, 2045–2053 (2016). https://doi.org/10.1007/s10008-016-3208-5
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DOI: https://doi.org/10.1007/s10008-016-3208-5