A production method of anhydrous iron phosphate and its special molding tool

A production method and technology of ferric phosphate dihydrate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of heat transfer attenuation, slow heat transfer, large specific surface area of ​​powder, etc. The effect of improving production efficiency and small specific surface area

Active Publication Date: 2018-04-03
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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  • A production method of anhydrous iron phosphate and its special molding tool
  • A production method of anhydrous iron phosphate and its special molding tool
  • A production method of anhydrous iron phosphate and its special molding tool

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 production method of anhydrous iron phosphate and a special molding tool thereof. The production method is to mold the ferric phosphate dihydrate powder filled in a sagger, evenly arrange a plurality of heat-conducting air holes, and then heat the mold at 580°C After roasting and dehydration at ‑630°C, anhydrous iron phosphate with small specific surface area can be obtained. The tool includes a sagger and a model matching the sagger; the model includes a mold cover, a mold column and a handle; the mold column is evenly arranged on the bottom of the mold cover and has the same height as the depth of the sagger cavity; the handle is fixed on the mold The top of the cover; when the powder is molded, the mold cover is matched with the upper end of the cavity of the sagger, and the mold column is inserted into the powder and extends to the bottom of the cavity. This method conducts the heat transfer path and reduces the attenuation gradient, thereby achieving a high dehydration rate and ensuring a small specific surface area. The special molding tool has simple and reasonable structural design, high molding efficiency, and can effectively improve production efficiency.

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 Patents(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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