Porous V2O5/C composite microspheres of lithium secondary battery positive electrode material and preparation method of porous V2O5/C composite microspheres

Abstract

The invention discloses porous V2O5/C composite microspheres of a lithium secondary battery positive electrode material and a preparation method of the porous V2O5/C composite microspheres. The porous V2O5/C composite microspheres are formed by clustering carbon coated V2O5 nano composite particles with the particle sizes of 5-30 mirons, and the porous V2O5/C composite microspheres are internally provided with porous structures. The preparation method comprises the following steps of synthesizing crosslinked polymethyl methacrylate PMMA microgel spheres, hydrolyzing partially so as to act as a mold plate for synthesizing the porous V2O5/C composite microspheres; adsorbing VO<2+> to three-dimensional meshes of the PMMA mold plate, changing the pH value of an adsorption solution, hydrolyzing the VO<2+> to generate V2O5 nano particles, and filling the three-dimensional meshes in situ with the V2O5 nano particles so as to obtain a V2O5/PMMA precursor; and forging the precursor so as to obtain the porous V2O5/C composite microspheres. The composite microsphere has the beneficial effects of improving the multiplying performance and the cycle performance and the like; the preparation method is simple in technology, and is suitable for being used in large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and relates to a lithium battery material and a preparation method thereof, in particular to a lithium secondary battery cathode material porous V 2 o 5 / C composite microsphere and its preparation method. Background technique [0002] In recent years, the rapid development of industry and economy has made the energy problem very prominent. The development of new energy is one of the major problems that must be solved in the 21st century. Therefore, people vigorously develop energy such as water energy, wind energy, nuclear energy and solar energy, and finally output it in the form of electric energy. And been widely used. In addition, chemical power sources such as lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries are based on redox reactions and output electric energy to external loads. They are widely used in electric vehicles, power tools, and portable elec...

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Problems solved by technology

The obtained material was discharged at a current density of 0.03A / g in the voltage range of 4-2.5V, and the specific capacity was 215 mAh / g, and the capacity retention rate was 99% after 200 cycles; when discharged at a current density of 3A / g, the specific capacity It is 140 mAh / g, but the improvement of its cycle performance is unknown

Although V2O5 nanomaterials can improve their electrochemical properties to a certain extent, the sol-gel method and hydrothermal reaction method are not only complicated in synthesis process , and it is difficult to control the structure of the product during the preparation process, and it is difficult to produce on a large scale

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