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V2O5·nH2O/graphene composites have been fabricated via a facile sol–gel method followed with an annealing treatment in air. The influence of incorporation of graphene on the microstructure and sodium storage performance of V2O5·nH2O were investigated. XRD, Raman, and TGA analyses validated that graphene was successfully incorporated in V2O5·nH2O particles; XPS tests revealed that the incorporation...
α-Ni(OH)2 has attracted great attention as a cathode material for alkaline secondary batteries (ASBs) because of its high theoretical capacity and small volume change during charge/discharge cycles. However, poor cycling stability and low electronic conductivity of α-Ni(OH)2 severely hinder its development and practical applications in ASBs. In this work, α-Ni(OH)2/graphene nanosheet composite was...
Nickel hydroxides with hierarchical micro-nano structures are prepared by a facile homogeneous precipitation method with different nickel salts (Ni(NO3)2·6H2O, NiCl2·6H2O, and NiSO4·6H2O) as raw materials. The effect of nickel sources on the microstructure and lithium storage performance of the nickel hydroxides is studied. It is found that all the three prepared samples are α-nickel hydroxide. The...
α-Nickel hydroxide codoped with Al3+ and Ca2+ was prepared by chemical coprecipitation method. The phase structure and surface morphology of the prepared samples were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The electrochemical performances of the prepared samples were analyzed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge/discharge...
LiTi2O4 anode material for lithium-ion battery has been prepared by a novel one-step solid-state reaction method using Li2CO3, TiO2, and carbon black as raw materials. X-ray diffraction, scanning electron microscopy, energy-dispersive spectrometry, and the determination of electrochemical properties show that the single phase of LiTi2O4 with spinel crystal structure is formed at 850 °C by this new...
Nickel hydroxide powder is prepared by chemical precipitation method, and the effect of synthesis temperature on the phase structure and electrochemical performances of nickel hydroxide is investigated. The phase structure is characterized by X-ray diffraction (XRD), and the electrochemical performances are characterized by cyclic voltammetry, electrochemical impedance spectroscopy, and charge/discharge...
Li3V2(PO4)3/C samples were synthesized by two different synthesis methods. Their influence on electrochemical performances of Li3V2(PO4)3/C as cathode materials for lithium-ion batteries was investigated. The structure and morphology of Li3V2(PO4)3/C samples were characterized by X-ray diffraction and scanning electron microscopy. Electrochemical performance was characterized by charge/discharge,...
Amorphous nickel hydroxide codoped with Fe3+ and CO 32− was synthesized by micro-emulsion precipitation method combined with rapid freezing technique. The microstructure and composition of the sample were characterized by X-ray diffraction and IR analysis. The electrochemical performance of the sample was analyzed by cyclic voltammetry, electrochemical impedance spectroscopy, and charge–discharge...
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