Method for preparing fluorizated lithium vanadium phosphate as lithium-ion battery anode material by using spray pyrolysis method

Abstract

The invention discloses a method for preparing fluorizated lithium vanadium phosphate as a lithium-ion battery anode material by using a spray pyrolysis method. The preparation method comprises the following steps of: respectively adding a phosphate source, a vanadium source, a lithium source, a fluorine source, hydrazine hydrate and additives in a certain stoichiometric proportion to water, stirring for 30min to uniformly mix after adding each substance, and finally, forming a mixed solution with the metal ion concentration of 0.2-1.0mol / L; then, putting the mixed solution in a hydrogen airflow spray dryer, spraying and drying at 200-300 DEG C and collecting the product to obtain precursor powder; and tabletting the precursor powder at the pressure of 20MPa, then, sintering at 600-800 DEG C for 10h under hydrogen protection and naturally cooling to a room temperature to obtain LiVPO4F. The method has low raw material cost, simple operation process, strong controllability and high reproduction, effectively shortens the synthesis period of the material and saves the production cost. The fluorizated lithium vanadium phosphate synthesized by applying the method has the grain diameter of 60-500nm, good grain dispersibility, high crystallinity degree, higher reversible capacity and favorable cycle life, can meet various needs of the practical applications of the lithium-ion battery and can be directly used for the mass production of the lithium-ion battery anode material.

Description

technical field [0001] The invention relates to a method for preparing a lithium ion battery positive electrode material, in particular to a method for preparing lithium ion battery positive electrode material fluorinated lithium vanadium phosphate by a spray pyrolysis method. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, power tools, energy storage devices, electric vehicles and hybrid electric vehicles due to their advantages of high working potential, high specific energy, high specific power, long cycle life and no pollution. Lithium-ion batteries are generally composed of positive and negative active materials, electrolytes, separators, current collectors, etc. Among these components, active materials are the most important components of lithium-ion batteries and key active points for energy storage, especially It is the positive electrode material, and its cost accounts for about 40% of the entire battery. Therefore...

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Problems solved by technology

Currently, synthetic LiVPO 4 The main method of F is a high-temperature solid-phase multi-step reaction method under the protection of an inert gas, but this kind of preparation process has the disadvantages of complicated and changeable process, long cycle, excessive energy consumption, high cost, etc., and the purity of the obtained material is not high. High, large particles and uneven distribution, poor electrochemical performance, not conducive to large-scale industrial production

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