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

A fluorinated lithium vanadium phosphate, lithium ion battery technology, applied in battery electrodes, circuits, phosphorus compounds, etc., can solve problems such as unfavorable industrial production, low material purity, poor electrochemical performance, etc., to shorten the synthesis cycle, simplify the Preparation process, good dispersion effect

Inactive Publication Date: 2011-06-01
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the implementation examples.

[0021] Implementation example 1

[0022] Add 0.4mol ammonium dihydrogen phosphate, 0.2mol ammonium metavanadate, 0.2mol lithium oxalate, 0.2mol ammonium fluoride, 0.2mol hydrazine hydrate, and 0.4mol maltose to water respectively, and stir with a mechanical stirrer after each substance is added After 30 minutes, make it evenly mixed, the total volume of the final mixed solution is 400mL, then put the mixed solution into an argon gas flow spray dryer, spray dry at 300°C, and collect the product to obtain the precursor powder. The resulting precursor powder was pressed into tablets under a pressure of 20 MPa, then sintered at 800 °C for 10 hours under the protection of argon, and then naturally cooled to room temperature to obtain LiVPO 4 F. X-ray powder diffraction analysis showed that the obtained product was pure LiVPO 4 F, there is no other impurity ph...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/455H01M4/485
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 舒杰水淼任元龙黄锋涛王青春徐丹
Owner NINGBO UNIV
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