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High-quality monodisperse multiporous hierarchical micro/nanostructured ZnCo2O4 microspheres have been fabricated by calcinating the Zn1/3Co2/3CO3 precursor prepared by urea-assisted solvothermal method. The as-prepared products are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), and Brunauer-Emmett-Teller...
Lithium-rich cathode materials Li1.2Ni0.13Co0.13Mn0.54O2 with (sample SF) and without (sample SP) formamide was synthesized by a spray-dry method. The crystalline structure and particle morphology of as-prepared materials were characterized by X-ray diffraction and scanning electron microscope. The specific surface area (SSA) of the Li1.2Ni0.13Co0.13Mn0.54O2 prepared from different routes was determined...
AlF3-coating is attempted to improve the performance of LiNi0.5Mn1.5O4 cathode materials for Li-ion batteries. The prepared powders are characterized by scanning electron microscope, powder X-ray diffraction, charge/discharge, and impedance. The coated LiNi0.5Mn1.5O4 samples show higher discharge capacity, better rate capability, and higher capacity retention than the uncoated samples. Among the coated...
The electrochemical characteristics of the sulfur composite cathode for reversible lithium storage were investigated based on different charge/discharge manner. The sulfur composites showed novel electrochemical characteristics as well as the high specific capacity and the good cycleability. The investigation showed that the deep discharge down to less than 1.0 V benefited the performance of the sulfur...
Preparing spherical particles with carbon additive is considered as one effective way to improve both high rate performance and tap density of Li4Ti5O12 and LiFePO4 materials. Spherical Li4Ti5O12/C and LiFePO4/C composites are prepared by spray-drying–solid-state reaction method and controlled crystallization–carbothermal reduction method, respectively. The X-ray diffraction characterization, scanning...
The lithium secondary batteries with high power density need the electrode materials with both high specific capacity and high tap density. An “outer gel” method by TiCl4 as the raw material has been developed to prepare spherical precursor. High tap density spherical Li4Ti5O12 is synthesized by sintering the mixture of precursor and Li2CO3. La-doped Li4Ti5O12 is also prepared by this method. X-ray...
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