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The development of high-performance biomass-derived porous graphitic carbon materials is in high demand for applications in supercapacitors. Herein, a novel N, S self-codoped porous graphitic carbon is synthesized by one-step carbonization of lotus leaves together with urea and ferric chloride. Due to the combination of urea as a nitrogen doping agent and ferric chloride as both activating agent and...
Li2Fe1-x-yMnxTiySiO4/C (x = 0.05~0.20, y = 0.02~0.08), a porous spherical cathode material for lithium-ion batteries, has been prepared by combining the sol-gel, spray drying, and microwave synthesis method, and co-doped Li2FeSiO4 with the Mn2+ and Ti4+on the iron site. The effects of Mn2+ and Ti4+ co-doping on the crystal structure, microstructure, and electrochemical performance Li2FeSiO4 were investigated...
The lithiated transition metal oxide precursor (LNCMO) with typical α-NaFeO2 structure and imperfect crystallinity, obtained from a hydrothermal process, was pretreated at 500 °C and then subjected to sintering at 800–920 °C to synthesize the ternary layered LiNi0.5Co0.2Mn0.3O2 (NCM523). X-ray diffraction (XRD), scanning electron microscope (SEM), cyclic voltammetry (CV), electrochemical impedance...
Various synthesis methods have been developed to synthesize mixed metal oxide cathode materials, whereas the scale-up production is hindered by issues of complicated processes, high cost, and inhomogeneity of the prepared materials. Herein, a facile, low-cost, and scalable synthesis route using M2(OH)2(C8H4O4)-class metal-organic frameworks (PTA-based MOFs) as precursors has been explored to synthesize...
LiFePO4/C nanocomposites are synthesized by a propylene oxide-assisted fast sol–gel method using FeCl3, LiNO3, NH4H2PO4, and sucrose as the starting materials. It was found that after adding propylene oxide into the solution containing the starting materials, a monolithic jelly-like FePO4 gel containing lithium and carbon source is generated in a few minutes without controlling the pH value of the...
Anode material for lithium-ion battery based on Sn/carbon nanotube (CNT) composite is synthesized via a chemical reduction method. The Sn/CNT composite is characterized by thermogravimetry, X-ray diffraction, and transition electron microscopy. The Sn/CNT composite delivers high initial reversible capacity of 630.5 mAh g−1 and exhibits stable cycling performance with a reversible capacity of 413 mAh...
Nanoflakes-built pyrite FeS2 microspheres were synthesized through a simple solvothermal process in mixed solvents of N, N-dimethytformamide and ethylene glycol without using any surfactant. Both the composition of the solvents and urea were key factors for the formation of the uniform products. It was found that the flake-like intermediate products transformed into FeS2 nanoflakes in situ in the...
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