Preparation method of high-density lithium iron phosphate material

A lithium iron phosphate, high-density technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of difficulty in densification, difficulty in improving compaction density, and difficulty in ensuring the regularity of secondary particles, and achieve high production efficiency. , The effect of convenient operation and easy availability of raw materials

Active Publication Date: 2017-04-26
TIANJIN XIANZHONG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the lithium iron phosphate produced by most manufacturers is crushed by airflow crushing, and it is difficult to ensure the regularity of the secondary particles.
Due to the bridging effect of such materials, it is difficult to increase the compaction density.
Secondly, the primary grains of lithium iron phosphate produced by many processes are non-spherical, and it is difficult to achieve densification of the basic structure

Method used

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  • Preparation method of high-density lithium iron phosphate material
  • Preparation method of high-density lithium iron phosphate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing a high-density lithium iron phosphate material, comprising the following processes:

[0030] 1) Manufacture spherical iron phosphate

[0031] First, dry-mill the anhydrous ferric phosphate until its average particle size reaches below 0.5um, take it out and put it into a fusion spheroidizer to continue shaping;

[0032] 2) Preparation of spherical precursor

[0033] After uniformly mixing the iron phosphate with the lithium source and the carbon source, it is further ground in a liquid phase system, and then made into a dry spherical precursor by a spray method;

[0034] 3) Precursor densification

[0035] Place the spherical precursor in a high-pressure chamber, pressurize it for 0.2-5 hours with an air pressure of 10-100MPa, take it out and sinter it in an electric furnace;

[0036] 4) Prepare high-density lithium iron phosphate

[0037] The sintered material is graded by a classifier, and the lithium iron phosphate materials of different pa...

Embodiment 2

[0041] A method for preparing a high-density lithium iron phosphate material, comprising the following processes:

[0042] 1) Manufacture spherical iron phosphate

[0043] First, dry-mill the anhydrous ferric phosphate until its average particle size reaches below 0.5um, take it out and put it into a fusion spheroidizer to continue shaping;

[0044] 2) Preparation of spherical precursor

[0045] After uniformly mixing the iron phosphate with the lithium source and the carbon source, it is further ground in a liquid phase system, and then made into a dry spherical precursor by a spray method;

[0046] 3) Precursor densification

[0047] Place the spherical precursor in a high-pressure chamber, pressurize it for 0.2-5 hours with an air pressure of 10-100MPa, take it out and sinter it in an electric furnace;

[0048] 4) Prepare high-density lithium iron phosphate

[0049] The sintered material is graded by a classifier, and the lithium iron phosphate materials of different pa...

Embodiment 3

[0053] A method for preparing a high-density lithium iron phosphate material, comprising the following processes:

[0054] 1) Manufacture spherical iron phosphate

[0055] First, dry-mill the anhydrous ferric phosphate until its average particle size reaches below 0.5um, take it out and put it into a fusion spheroidizer to continue shaping;

[0056] 2) Preparation of spherical precursor

[0057]After uniformly mixing the iron phosphate with the lithium source and the carbon source, it is further ground in a liquid phase system, and then made into a dry spherical precursor by a spray method;

[0058] 3) Precursor densification

[0059] Place the spherical precursor in a high-pressure chamber, pressurize it for 0.2-5 hours with an air pressure of 10-100MPa, take it out and sinter it in an electric furnace;

[0060] 4) Prepare high-density lithium iron phosphate

[0061] The sintered material is graded by a classifier, and the lithium iron phosphate materials of different par...

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Abstract

The invention relates to a preparation method of a high-density lithium iron phosphate material, and belongs to the technical field of lithium-ion batteries. The preparation method of the high-density lithium iron phosphate material comprises the following technical processes of (1) manufacturing spherical iron phosphate, namely carrying out dry ball milling on anhydrous iron phosphate, taking out the product, putting the product into a fusion spheronizer and further shaping the product for 1-10 hours; (2) preparing a spherical precursor, namely mixing the iron phosphate with a lithium source and a carbon source evenly, further grinding under a liquid-phase system and then preparing the dry spherical precursor through a spraying method; (3) densifying the precursor, namely supercharging the dry spherical precursor through air pressure of 10-100MPa for 0.2-5 hours, taking out the spherical precursor and then sintering in an electric furnace; and (4) preparing high-density lithium iron phosphate, namely carrying out particle size classification on the material through a classifier, carrying out particle size matching mixing and achieving hole filling to obtain the high-compaction density lithium iron phosphate material. The method has the advantages of being simple in process, convenient to operate, accurate in control and high in production efficiency, and the volume energy density of the lithium-ion battery can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a preparation method of a high-density lithium iron phosphate material. Background technique [0002] At present, lithium-ion batteries have the advantages of high specific energy, large capacity, and reliable performance, and have become the main energy carrier of electric vehicle batteries. Among them, lithium iron phosphate is the preferred cathode material in lithium-ion batteries due to its ultra-high safety and long cycle life. [0003] In order to further increase the energy density of the lithium-ion battery system, it is necessary to achieve a high compaction density of the lithium iron phosphate material. At present, when lithium iron phosphate materials are used in lithium-ion batteries, the compacted density of the manufactured pole pieces is generally 2.2-2.3g / cm -3 , it is difficult to further improve. If the high-pressure compaction is forced, it m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/5825Y02E60/10
Inventor 王芳纪继坤李凤民
Owner TIANJIN XIANZHONG SCI & TECH
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