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Despite its high energy density, high-voltage LiNi0.5Mn0.5O2 cathode which suffers from a poor cycle performance that originated from the cathode structural collapse is still far from commercialization. Doping heteroatom into the lattice of LiNi0.5Mn0.5O2 is believed to be a valid strategy in overcoming this bottleneck. Herein, Si was employed as a dopant to comprehensively improve the electrochemical...
The inherent disadvantages of untreated carbon felt (pristine-CF) still restrict the vanadium redox flow battery (VRFB) from further improving in electrochemical performances. To solve this problem, the carbon felt (CF) decorated with bismuth hydrogen edetate (Bi(HEDTA)) complex was synthesized and studied as anode for VRFB. The cyclic voltammetry curve reflects the great improvement in electrochemical...
To improve the cycle performance, zLi2TiO3@LiNi0.5Mn0.5O2 (z = 0, 1, 3 and 5 mol%) (“@” means “was coated on the surface of”) cathode materials have been successfully prepared via a syn-lithiation strategy. The high-resolution transmission electron microscope (HRTEM) structural analysis results show that Li2TiO3 is evenly coated on the surface of LiNi0.5Mn0.5O2, with the thickness of the coating layer...
The application of LiNi0.5Mn0.5O2 as a high-voltage cathode material for lithium-ion batteries is limited by its poor cycle performance. Therefore, we attempt to improve the cyclability of this material at high voltage by using a doping method and propose a detailed mechanism for the effect of the doping amount on the structure and electrochemical performance. In this work, LiNi0.5-zAlzMn0.5O2 (z...
Three-dimensional hierarchical Co3O4@C hollow microspheres (Co3O4@C HSs) are successfully fabricated by a facile and scalable method. The Co3O4@C HSs are composed of numerous Co3O4 nanoparticles uniformly coated by a thin layer of carbon. Due to its stable 3D hierarchical hollow structure and uniform carbon coating, the Co3O4@C HSs exhibit excellent electrochemical performance as an anode material...
δ-Manganese dioxide (MnO2) has been proved to own the excellent electrochemical performances for a long time. But few of studies report the electrochemical performances of δ-MnO2 film. Here, we synthesize δ-MnO2 film on fluorine-doped tin oxide (FTO) glass via a simple redox reaction at the room temperature. The X-ray diffraction (XRD) and Raman spectroscopy are used to confirm the physical structure,...
Graphene-carbon nanofiber/MnO2 nanocomposite paper (GMP) is prepared via a simple chemical reaction between KMnO4 and carbon materials in acidic solution, in which MnO2 nanosheets are uniformly deposited on the graphene-carbon nanofiber paper. Owing to its freestanding structure, GMP is directly used as an electrode in the electrochemical tests without addition of any binders or conductive additives...
The present work was performed in order to evaluate sulfamic acid as the supporting electrolyte for VO2+/VO2+ redox couple in vanadium redox flow battery. The oxidation process of VO2+ has similar electrochemical kinetics compared with the reduction process of VO2+. The exchange current density and standard rate constant of VO2+/VO2+ redox reaction on a graphite electrode in sulfamic acid are determined...
Influence of In3+ ions on electrochemical performance of positive electrolyte for vanadium redox flow battery was investigated in this paper. The electrochemical activity and kinetics of V(IV)/V(V) redox couple can be enhanced by the addition of In3+ ions, and the optimal concentration of In3+ ions was found at 10 mM. At this condition, the oxidation peak current with 10 mM In3+ ions is 46.6 mA at...
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