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Method for preparing iron-lithium phosphate by using high-purity magnet fine mineral powder as iron source

A technology of magnetite concentrate and lithium iron phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as hindering large-scale application, high cost of lithium iron phosphate, etc., and achieve product performance consistency High, high rate cycle performance, low control difficulty

Active Publication Date: 2012-08-22
SINOSTEEL ANHUI TIANYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to the high cost of lithium iron phosphate, which hinders its large-scale application in practice to a certain extent.

Method used

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  • Method for preparing iron-lithium phosphate by using high-purity magnet fine mineral powder as iron source
  • Method for preparing iron-lithium phosphate by using high-purity magnet fine mineral powder as iron source
  • Method for preparing iron-lithium phosphate by using high-purity magnet fine mineral powder as iron source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 10Kg of high-purity magnetite concentrate powder with a purity of 99% and an average particle size of about 100 um into a ball mill for primary grinding, and grind for 8 hours to obtain primary ground powder with an average particle size of about 15 um. Then add the primary grinding powder to the high-energy ball mill, and after ball milling for 8 hours, an ultra-fine high-purity magnetite concentrate powder with an average particle size of about 0.8um is obtained.

[0033] (2) Add 10Kg ultrafine high-purity magnetite concentrate powder, 13.4Kg purity of 99.6% lithium dihydrogen phosphate, 3.4Kg purity of 99.6% glucose monohydrate, 107.1Kg deionized water in the ball mill, and ball mill for 5 hours.

[0034] (3) Use a centrifugal spray drying granulator to dry and granulate the slurry after ball milling to obtain a lithium iron phosphate precursor with an average particle size of about 2 μm.

[0035] (4) Put the lithium iron phosphate precursor into a pusher kil...

Embodiment 2

[0037] (1) Add 10Kg of high-purity magnetite concentrate powder with a purity of 99% and an average particle size of about 100 um into a ball mill for primary grinding, and grind for 5 hours to obtain primary ground powder with an average particle size of about 20 um. Then add the primary grinding powder into the high-energy ball mill, and after ball milling for 5 hours, an ultra-fine high-purity magnetite concentrate powder with an average particle size of about 1.5um is obtained.

[0038] (2) Adding 10Kg ultrafine high-purity magnetite concentrate powder, 14.9Kg purity is 99% ammonium dihydrogen phosphate, 5.5Kg purity is 99.5% lithium hydroxide, 3.4Kg purity is 99.6% glucose monohydrate in ball mill , 135.2Kg deionized water, ball milled for 3 hours.

[0039] (3) Use a centrifugal spray drying granulator to dry and granulate the slurry after ball milling to obtain a lithium iron phosphate precursor with an average particle size of about 5 μm.

[0040] (4) Put the lithium i...

Embodiment 3

[0042] (1) Add 10Kg of high-purity magnetite concentrate powder with a purity of 99% and an average particle size of about 100 um into a ball mill for primary grinding, and grind for 8 hours to obtain primary ground powder with an average particle size of about 15 um. Then add the primary grinding powder to the high-energy ball mill, and after ball milling for 8 hours, an ultra-fine high-purity magnetite concentrate powder with an average particle size of about 0.8um is obtained.

[0043] (2) Add 10Kg ultra-fine high-purity magnetite concentrate powder, 13.4Kg purity of 99.6% lithium dihydrogen phosphate, 2.9Kg purity of 99.8% fructose, 107.1Kg deionized water in the ball mill, and ball mill for 5 hours.

[0044] (3) Use a centrifugal spray drying granulator to dry and granulate the slurry after ball milling to obtain a lithium iron phosphate precursor with an average particle size of about 5 μm.

[0045](4) Put the lithium iron phosphate precursor into a pusher kiln under the...

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Abstract

The invention discloses a method for preparing iron-lithium phosphate by using high-purity magnet fine mineral powder as an iron source. The method comprises the following steps of: (1) filling the high-purity magnet fine mineral powder into a ball mill for segmental ball milling to obtain superfine high-purity magnet fine mineral powder; (2) mixing the superfine high-purity magnet fine mineral powder with a phosphorus source, a lithium source or a phosphorus-lithium source, adding a carbon source in the mixture, and uniformly mixing the mixture again; (3) feeding the mixture into the ball mill, and performing ball milling on the mixture by taking water or ethanol as a dispersing agent; (4) drying and granulating slurry after the ball milling by using spray drying machinery to obtain an iron-lithium phosphate precursor; and (5) filling the lithium-iron precursor into a kiln for sintering under the protection of inert gases to obtain a high-purity and spherical iron-lithium phosphate material. The method has the advantages of low production cost and easy control; and the obtained material has high performance and can be widely used in industrial production of lithium-iron phosphate.

Description

technical field [0001] The invention relates to a preparation technology of lithium iron phosphate, a cathode material of a lithium ion battery, in particular to a method for preparing lithium iron phosphate by using high-purity magnetite concentrate powder as an iron source. Background technique [0002] Lithium iron phosphate is a new type of cathode material for lithium-ion batteries, with a theoretical capacity of 169.4mAh / g and a voltage of about 3.4V for lithium platforms. The strong covalent bond in lithium iron phosphate enables it to maintain a highly stable crystal structure during charge and discharge, so it has a longer cycle life and higher safety performance. In addition, lithium iron phosphate has the advantages of non-toxicity and pollution-free. Due to the above obvious advantages of lithium iron phosphate, it has become the focus of attention of the lithium battery industry in recent years. According to the introduction of relevant literature, the curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45H01M4/1397H01M4/58
CPCY02E60/122Y02E60/10
Inventor 杨洋余进周升旺王以存张健康李如宏王克玉
Owner SINOSTEEL ANHUI TIANYUAN TECH
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