Preparation method of nano sheet negative electrode material, phosphoric acid oxygen vanadium, of lithium ion battery

Abstract

The invention discloses a preparation method of a nano sheet negative electrode material, phosphoric acid oxygen vanadium, of a lithium ion battery. The preparation method comprises the steps of dissolving a vanadium source, a phosphorus source and a reducing agent, which are taken as raw materials and are mixed according to the molar ratio of 1 to 1 to (1-5), in deionized water, stirring in water bath at 70-90 DEG C for 4 hours to obtain a uniform solution, regulating the pH of the uniform solution to 6-9, carrying out pyrolysis on the uniform solution in a pyrolysis tank at 150-350 DEG C for 10-30 hours, filtering products, drying the filtered products at 80-120 DEG C so as to obtain an amorphous phosphoric acid oxygen vanadium precursor, sintering the precursor under a non-reducing atmosphere at 200-400 DEG C for 1-10 hours, and cooling to indoor temperature so as to obtain phosphoric acid oxygen vanadium. The method provided by the invention has the advantages that the reaction temperature is low, the reaction time is short, the steps are simple, the raw materials are easily available, and the industrialization control is convenient; the prepared phosphoric acid oxygen vanadium material has the advantages that a granule structure is subjected to nanocrystallization, the specific surface area is large, the full infiltration of electrolyte and the delivery of lithium ions are facilitated, and the negative electrode material, phosphoric acid oxygen vanadium, has the excellent electrochemical property.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of vanadyl phosphate, a negative electrode material of a nano-sheet lithium-ion battery. Background technique [0002] Lithium-ion battery anode material is a key component of lithium-ion batteries. At present, graphite is mainly used as anode in commercial production, but the theoretical specific capacity of both natural graphite and artificial graphite is only 372mAh / g. Although the graphite negative electrode has the advantages of low cost and good safety, with the development of some high specific capacity positive electrode materials, graphite with a lower specific capacity as the negative electrode can no longer meet the needs of positive electrode materials. Therefore, the development of high specific capacity anode materials has great potential value. [0003] Vanadyl Phosphate (VOPO 4 ) Similar to graphite, alloys and meta...

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Problems solved by technology

[0004] Currently, VOPO 4 The research is still mainly focused on the positive electrode material of lithium ion battery, but its research as the negative electrode material of lithium ion battery has not been reported yet.

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