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Method for preparing lithium vanadium phosphate (positive electrode material) of lithium ion cell

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as unfavorable industrial production, cumbersome steps, complicated operation, etc., and achieve easy industrial production, simple operation, and advanced technology The effect of process shortening

Inactive Publication Date: 2017-01-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What these methods have in common is that they all need to reduce the toxic pentavalent vanadium source compound, and there are cumbersome steps and complicated operations, which are not conducive to industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 0.1mol (39g) vanadium sulfate (V 2 (SO 4 ) 3 ), was added into 200mL deionized water, and ultrasonically dissolved to obtain solution A containing trivalent vanadium ions.

[0030] The pH value of solution A was adjusted to 6 with sodium hydroxide solution (concentration: 20 wt%), and a large amount of precipitate B was produced in solution A.

[0031] Dissolve the precipitate B in 200 mL of phosphoric acid solution, and reflux at 100° C. for 6 h under the protection of argon to obtain the precipitate C, which is filtered and washed.

[0032] Dry the precipitate C at 60°C for 2 h under vacuum to obtain vanadium phosphate (VPO 4 )solid.

[0033] The prepared vanadium phosphate was mixed with lithium carbonate at a molar ratio equal to 2.5, ball milled for 2 hours, and then sintered at 500°C for 8 hours under the protection of argon to obtain lithium vanadium phosphate cathode material M1.

[0034] M1 was used as the positive electrode material to assemble a li...

Embodiment 2

[0036] Weigh 0.1mol (15.75g) vanadium trichloride (VCl 3 ), was added into 200mL deionized water, and ultrasonically dissolved to obtain solution A containing trivalent vanadium ions.

[0037] The pH value of solution A was adjusted to 7 with ammonia water (concentration: 20 wt%), and a large amount of precipitate B was produced in solution A.

[0038] Dissolve the precipitate B in 200 mL of phosphoric acid solution, and reflux at 120° C. for 4 h under the protection of argon to obtain the precipitate C, which is filtered and washed.

[0039] The precipitate C was dried under vacuum at 50°C for 3 h to obtain vanadium phosphate (VPO 4 )solid.

[0040] The prepared vanadium phosphate was mixed with lithium carbonate at a molar ratio equal to 2.5, ball milled for 2 hours, and then sintered at 500° C. for 8 hours under the protection of argon to obtain lithium vanadium phosphate cathode material M2.

[0041] Using M2 as the positive electrode material to assemble a lithium-ion ...

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Abstract

The invention provides a method for preparing a lithium vanadium phosphate (positive electrode material) of a lithium ion cell. The method comprises the following steps: carrying out reaction on trivalent vanadium source compound and alkali, thereby acquiring vanadium hydroxide, wherein the trivalent vanadium source compound is vanadium sulphate and / or vanadium chloride; carrying out reaction on vanadium hydroxide and phosphoric acid, thereby acquiring vanadium phosphate; mixing vanadium phosphate with lithium hydroxide or lithium carbonate and sintering, thereby acquiring the lithium vanadium phosphate (positive electrode material) of the lithium ion cell. According to the method, instead of the toxic pentavalent vanadium source compound, trivalent vanadium sulphate or vanadium chloride is utilized to prepare vanadium phosphate, so that the technique is more environmentally friendly. The step of reducing the pentavalent vanadium source compound is avoided in the vanadium phosphate preparation process, so that the technological process is shortened, the operation is simple and the industrial production is easily realized.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a method for preparing lithium vanadium phosphate, a cathode material of lithium ion batteries. Background technique [0002] Generally, the faster the social economy develops, the greater the demand for energy. At the same time, the problem of environmental degradation caused by the rapid depletion of fossil energy and the burning of fossil energy has become increasingly prominent. In order to reduce the use of fossil energy, people are paying more and more attention to the development of electric vehicles. Among the existing power batteries used in electric vehicles, lithium-ion batteries have an absolute advantage as a power battery because of their advantages such as high energy density, high voltage, long cycle life, and no memory effect. [0003] The positive electrode material is a key part of the lithium-ion battery. At present, the main positive ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525C01B25/45
CPCC01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 陈勇
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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