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Method for producing anhydrous iron phosphate and special molder tool thereof

A production method and technology of modeling tools, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of heat transfer attenuation, slow heat transfer, and large specific surface area of ​​powder materials, so as to reduce the attenuation gradient and improve production Efficiency, effect of small specific surface area

Active Publication Date: 2016-07-06
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the roasting process, the container (saggar) transfers heat more slowly in the powder accumulation, especially the central part, and the water vapor of ferric phosphate dihydrate (powder) is difficult to escape from the powder during the dehydration process, and the dehydration rate is small. The specific surface area of ​​the powder after sintering in the center of the container (saggar) is as high as 30m2 / g, and the specific surface area of ​​anhydrous iron phosphate in the container (saggar) fluctuates greatly; The powder on the surface of the container (sagger) has been scorched (discolored), but there is still heat transfer attenuation in the center of the container (sagger), and the specific surface area of ​​the powder in the center of the container (sagger) is still large, so it is difficult to The specific surface area is reduced and restricts limited production efficiency

Method used

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  • Method for producing anhydrous iron phosphate and special molder tool thereof
  • Method for producing anhydrous iron phosphate and special molder tool thereof
  • Method for producing anhydrous iron phosphate and special molder tool thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Using the sagger in the prior art, put the iron phosphate dihydrate powder into the sagger, and use a molding tool to evenly arrange 9 elliptical heat conduction vent holes in the powder. The vent holes extend from the opening end of the gate body to the gate. The bottom of the body extends until the bottom of the gate body; then roasting and dehydration are carried out at a temperature of 580°C. After the powder is roasted and dehydrated, the specific surface area is 7.3-10m 2 / g of anhydrous iron phosphate with a small specific surface area.

Embodiment 2

[0026] Using the sagger in the prior art, the iron phosphate dihydrate powder is put into the sagger, and 16 circular heat-conducting air holes are evenly arranged in the powder by using a molding tool. The air holes extend from the opening end of the gate body to The bottom of the lock body extends until the bottom of the lock body; then roasting and dehydration are carried out at a temperature of 600°C. After the powder is roasted and dehydrated, the specific surface area is 4-7.3m 2 / g of anhydrous iron phosphate with a small specific surface area.

Embodiment 3

[0028] Using a larger sagger than the prior art, put iron phosphate dihydrate powder into the sagger, and use modeling tools to evenly arrange 25 prismatic heat-conducting vent holes in the powder. The open end extends to the bottom of the gate body until the bottom of the gate body; then roasting and dehydration are carried out at a temperature of 630°C. After the powder is roasted and dehydrated, the specific surface area is 5-7.5m 2 / g of anhydrous iron phosphate with a small specific surface area.

[0029] The following is an orthogonal experiment with 9 circular heat conduction vents as an example, using three methods of no heat conduction ventilation, mesh ventilation and heat conduction hole ventilation, and conducting orthogonal experiments under different temperature conditions. The specific experimental data statistics are as follows: Among them, Table 1 shows four groups of experimental schemes, and Table 2 shows the statistical results of orthogonal experimental d...

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Abstract

The invention relates to a method for producing anhydrous iron phosphate and a special molder tool thereof. The production method comprises the following steps: modeling iron phosphate dihydrate powder contained in a sagger, and uniformly forming a plurality of heat-conducting air holes; and roasting and dehydrating at the temperature of 580 to 630 DEG C, thereby obtaining anhydrous iron phosphate with small specific surface area. The tool comprises a sagger and a mold matched with the sagger, wherein the mold comprises a mold cover, mold pillars and a handle, wherein the mold pillars are uniformly arranged at the bottom of the mold cover, and the height of each mold pillar is the same as depth of a mold cavity of the sagger; the handle is fixedly arranged on the top of the mold cover; and during powder shaping, the mold cover covers the upper end surface of the mold cavity of the sagger in a matched manner, and the mold pillars are inserted into the powder and stretch into the bottom of the mold cavity. According to the method, attenuation gradient is reduced by virtue of a conduction heat transfer path, so that a high dehydration rate is realized, and a small specific surface is obtained. The molder tool is simple and reasonable in structural design and high in molding efficiency, and the production efficiency can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and relates to the improvement of the specific surface area of ​​anhydrous iron phosphate, a positive electrode precursor material of lithium ion batteries. Anhydrous iron phosphate is the main raw material of lithium iron phosphate, the positive electrode material of lithium ion power batteries. It has a very high water absorption rate, which affects the safety of lithium iron phosphate batteries; in order to reduce the water absorption rate of anhydrous iron phosphate, thereby improving its specific surface area, the water absorption rate of lithium iron phosphate, the lithium battery material of the anhydrous iron phosphate, is correspondingly higher Low. Background technique [0002] At present, anhydrous iron phosphate is the main raw material of lithium iron phosphate, the cathode material of lithium-ion power batteries. Anhydrous iron phosphate has strong water absorp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37H01M4/58
CPCC01B25/375H01M4/5825Y02E60/10
Inventor 刘世琦
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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