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Preparation method for iron phosphate nanosheets

A nano-flaky, iron phosphate technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of complex and cumbersome operations, large particles, and long time consumption, and achieve high purity, large specific surface area, and accelerated ionization speed effect

Active Publication Date: 2019-10-01
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing nano-flaky iron phosphate, which solves the problems of existing iron phosphate with low purity and large particles, complex and cumbersome operation, high requirements for process conditions and high energy consumption. The question of duration
[0006] The present invention also provides a lithium iron phosphate electrode material for a lithium ion battery, which solves the problem that the electrochemical activity of the existing lithium iron phosphate electrode material is not high

Method used

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  • Preparation method for iron phosphate nanosheets
  • Preparation method for iron phosphate nanosheets
  • Preparation method for iron phosphate nanosheets

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1) Take a certain amount of 85% phosphoric acid and deionized water to prepare a 2 mol / L phosphoric acid solution in a volumetric flask, slowly add 9.3g iron black into the phosphoric acid solution at room temperature, and then stir electrically to obtain a reaction solution. The rotation speed is 400r / min, so that the ratio of iron black to phosphoric acid is 1:8.

[0029] 2) Heat the reaction solution obtained in step 1) to 80°C and continue to stir for 4 hours. After the reaction, a white precipitate of ferric phosphate dihydrate is obtained; the white precipitate is subjected to suction filtration, washing and other operations, and then the filter cake is placed in a drum Dry at 110°C in an air drying oven to obtain iron phosphate dihydrate powder.

[0030] 3) Put the ferric phosphate dihydrate powder obtained in step 2) into a muffle furnace for secondary dehydration at a temperature of 700°C, and obtain nano-flaky ferric phosphate after dehydration.

[0031] The ...

Embodiment 2

[0034] 1) Take a certain amount of 85% phosphoric acid and deionized water to prepare a 2.5 mol / L phosphoric acid solution in a volumetric flask, slowly add 9.3g iron black into the phosphoric acid solution at room temperature, and then stir electrically to obtain a reaction solution. The rotation speed is 400r / min, so that the ratio of iron black to phosphoric acid is 1:8.

[0035] 2) Heat the reaction solution obtained in step 1) to 80°C and continue to stir for 4 hours. After the reaction, a white precipitate of ferric phosphate dihydrate is obtained; the white precipitate is subjected to suction filtration, washing and other operations, and then the filter cake is placed in a drum Dry at 110°C in an air drying oven to obtain iron phosphate dihydrate powder.

[0036] 3) Put the ferric phosphate dihydrate powder obtained in step 2) into a muffle furnace for secondary dehydration at a temperature of 700°C, and obtain nano-flaky ferric phosphate after dehydration.

[0037] 1....

Embodiment 3

[0042] 1) Take a certain amount of 85% phosphoric acid and deionized water to prepare a 3 mol / L phosphoric acid solution in a volumetric flask, slowly add 9.3g iron black into the phosphoric acid solution at room temperature, and then stir electrically to obtain a reaction solution. The rotation speed is 400r / min, so that the ratio of iron black to phosphoric acid is 1:3.

[0043] 2) Heat the reaction solution obtained in step 1) to 90°C and continue to stir for 6 hours. After the reaction, a white precipitate of ferric phosphate dihydrate is obtained; the white precipitate is subjected to suction filtration, washing and other operations, and then the filter cake is placed in a drum Dry at 110°C in an air drying oven to obtain iron phosphate dihydrate powder.

[0044] 3) Put the ferric phosphate dihydrate powder obtained in step 2) into a muffle furnace for secondary dehydration at a dehydration temperature of 800°C, and obtain nano-flaky ferric phosphate after dehydration.

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Abstract

The invention discloses a preparation method for iron phosphate nanosheets. The preparation method comprises the steps that iron black is slowly added to phosphoric acid with the concentration of 1.5-3.0 mol / L, stirring and heating are conducted for reacting, and after the reaction, the iron phosphate nanosheets are obtained through suction filtration, washing, drying, dewatering and other steps.The iron phosphate prepared by using the method has a nanosheet-shaped morphology, the thickness of the nanosheets is 70-80 nanometers, and the specific surface area is high. By optimizing the reaction conditions, in the reaction procsess, the pH value does not need to be adjusted, and no oxidizing agents are added; the interference with anionic and cationic impurities is effectively avoided, theiron phosphate obtained by using the method is free of impurity phases and high in purity. Besides, less water is used for washing iron phosphate precipitation, the iron phosphate synthesizing cost isreduced, and the pollution to the environment is reduced. The technology is simple, operation is convenient, industrial production is facilitated, and the preparation method is wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a preparation method of nano-flaky iron phosphate. Background technique [0002] With the development of the economy, the problem of energy shortage and environmental pollution has become increasingly prominent, and lithium-ion batteries have attracted widespread attention as a new type of clean energy. Lithium-ion batteries have outstanding advantages such as high energy density, high working voltage, good cycle performance, no memory effect and small self-discharge, and have been widely used in small electronic devices. In addition, lithium-ion batteries are also used in new energy electric vehicles as automotive power batteries. In recent years, the output of lithium-ion batteries has been increasing, and the application fields are also expanding. It has gradually become an indispensable part of people's daily life and national economy. [0003] Lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B25/375C01P2002/72C01P2004/03C01P2004/64C01P2006/12
Inventor 陈建周孝林刘平卿龙高远洋
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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