Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of anhydrous iron phosphate

A technology of anhydrous phosphoric acid and phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of difficult component control, low product purity, complicated preparation process, etc., and achieve low price and simple production process , The effect of simplifying the process

Inactive Publication Date: 2017-04-26
SHANGHAI INST OF TECH
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing anhydrous iron phosphate, and the method for preparing anhydrous iron phosphate should solve the problem of product purity in the preparation process of iron phosphate materials in the prior art. Not high, containing an uncertain amount of crystal water and the presence of crystal water has some negative effects on the calcination process, complex preparation process, high production cost, and technical problems of difficult component control

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of anhydrous iron phosphate
  • Preparation method of anhydrous iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A preparation method of anhydrous ferric phosphate, specifically comprising the steps of:

[0054] (1) Add 115 parts by weight of phosphoric acid to 350 parts by weight of deionized water to prepare a phosphoric acid solution, slowly add 80 parts by weight of iron oxide powder under stirring, continue stirring, and mix evenly to obtain a stable mixed solution;

[0055] (2) Add the mixed solution of step (1) into a nano sand mill for ball milling, and control the reaction temperature during the ball milling process to 60°C. When the ball mill suspension with a particle size distribution D50 less than 100nm is obtained after ball milling for a certain period of time, take out materials. The obtained ball mill suspension was spray-dried at 200° C. to obtain spherical precursor powder.

[0056] (3) Calcining the spherical precursor powder obtained in step (2) in an air atmosphere at 700° C. for 2 hours to obtain anhydrous iron phosphate material.

[0057] Use X-ray diffra...

Embodiment 2

[0060] A preparation method of anhydrous ferric phosphate, specifically comprising the steps of:

[0061] (1) Add 121 parts by weight of phosphoric acid to 350 parts by weight of deionized water to prepare a phosphoric acid solution, slowly add 80 parts by weight of iron oxide powder under stirring, continue stirring, and mix evenly to obtain a stable mixed solution;

[0062] (2) Add the mixed solution of step (1) into a nano sand mill for ball milling, and control the reaction temperature during the ball milling process to 60°C. When the ball mill suspension with a particle size distribution D50 less than 100nm is obtained after ball milling for a certain period of time, take out materials. The obtained ball mill suspension was spray-dried at 200° C. to obtain spherical precursor powder.

[0063] (3) Calcining the spherical precursor powder obtained in step (2) in an air atmosphere at 750° C. for 4 hours to obtain anhydrous iron phosphate material.

[0064] The anhydrous ir...

Embodiment 3

[0067] A preparation method of anhydrous ferric phosphate, specifically comprising the steps of:

[0068] (1) Add 127 parts by weight of phosphoric acid to 350 parts by weight of deionized water to prepare a phosphoric acid solution, slowly add 80 parts by weight of iron oxide powder under stirring, continue stirring, and mix evenly to obtain a stable mixed solution;

[0069] (2) Add the mixed solution of step (1) into a nano sand mill for ball milling, and control the reaction temperature during the ball milling process to 60°C. When the ball mill suspension with a particle size distribution D50 less than 100nm is obtained after ball milling for a certain period of time, take out materials. The obtained ball mill suspension was spray-dried at 200° C. to obtain spherical precursor powder.

[0070] (3) Calcining the spherical precursor powder obtained in step (2) in an air atmosphere at 800° C. for 6 hours to obtain anhydrous iron phosphate material.

[0071] The anhydrous ir...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a synthesis method of anhydrous iron phosphate. The method comprises the following steps: adding 115-127 parts by weight of phosphoric acid to 350 parts by weight of deionized water to prepare a phosphoric acid solution, adding 80 parts by weight of iron oxide powder in a stirring state, uniformly mixing the phosphoric acid solution and the iron oxide powder, adding the obtained mixture to a nanometer sand mill, carrying out ball milling, controlling the reaction temperature in the ball milling process to be 60-80 DEG C, taking out a ball milling suspension having a particle size D50 being less than 100 nm and obtained after the ball milling is carried out for a certain period, carrying out spray drying on the obtained ball milling suspension at 180-220 DEG C to obtain spherical precursor powder, and calcining the spherical precursor powder in 700-800 DEG C air atmosphere for 2-6 h to obtain the anhydrous iron phosphate material. The pure phase iron phosphate material with spherical morphology characteristic is obtained through the method, and has uniform particle size and good dispersity. The synthesis method has the advantages of simple flow, no generation of waste gas or waste liquid in the whole process, and environmental protection requirement meeting.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a preparation method of anhydrous iron phosphate. Background technique [0002] As the upstream of the new energy vehicle industry chain, the lithium battery industry has gradually entered a stage of rapid development. Most domestic power batteries use lithium iron phosphate batteries and ternary batteries, which are used in new energy cars and buses. Lithium iron phosphate batteries are relatively safe, and the cost has also dropped significantly in recent years. Considering the maturity and economy of battery technology, the current power batteries for electric vehicles are mainly lithium iron phosphate batteries. [0003] Iron phosphate has a stable structure and has a similar crystal structure and unit cell parameters to lithium iron phosphate. As a precursor for the synthesis of lithium iron phosphate, it can effectively control the particle size of lithium iron phosphate. At...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37
CPCC01B25/375C01P2002/72C01P2004/03C01P2004/32C01P2004/61
Inventor 常程康陈雪平肖鹏关利吕庭键
Owner SHANGHAI INST OF TECH