A method for treating lithium iron phosphate as cathode material of power lithium battery

A lithium iron phosphate and cathode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low quality lithium iron phosphate battery, low service life, and high impurity content of lithium iron phosphate cathode material. Quality, increase battery life, reduce the effect of impurity content

Inactive Publication Date: 2019-01-25
新疆舰目摩托车有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high impurity content of the lithium iron phosphate cathode material in the production process, the quality of the lithium iron phosphate battery is not high and the service life is low

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for treating lithium iron phosphate, the positive electrode material of a power lithium battery, wherein the surface of the lithium iron phosphate is coated with carbon, comprising the following steps:

[0027] S1. Select lithium iron phosphate particles, and the particle size is selected as 3000 mesh;

[0028] S2. Put the selected lithium iron phosphate particles into a magnetic separator to remove the iron element in the lithium iron phosphate particles;

[0029] S3. Put the lithium iron phosphate particles after magnetic separation into the mixed solution of silver fluoride and hydrogen fluoride to replace the active metal impurities therein, and at the same time acidify the metal oxides therein, then filter and dry to obtain an intermediate product;

[0030] S4. The intermediate product obtained in S3 is separated by a color sorter;

[0031] S5. Pre-sintering the lithium iron phosphate particles obtained in S4;

[0032] S6. Sintering the pre-sintered lith...

Embodiment 2

[0041] A method for treating lithium iron phosphate, the positive electrode material of a power lithium battery, wherein the surface of the lithium iron phosphate is coated with carbon, comprising the following steps:

[0042] S1. Select lithium iron phosphate particles, and the particle size is selected as 3400 mesh;

[0043] S2. Put the selected lithium iron phosphate particles into a magnetic separator to remove the iron element in the lithium iron phosphate particles;

[0044] S3. Put the lithium iron phosphate particles after magnetic separation into the mixed solution of silver fluoride and hydrogen fluoride to replace the active metal impurities therein, and at the same time acidify the metal oxides therein, then filter and dry to obtain an intermediate product;

[0045] S4. The intermediate product obtained in S3 is separated by a color sorter;

[0046] S5. Pre-sintering the lithium iron phosphate particles obtained in S4;

[0047] S6. Sintering the pre-sintered lith...

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PUM

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Abstract

The invention discloses A method for treating lithium iron phosphate, a cathode material of power lithium battery which is characterized in that that surface of the lithium iron phosphate is coated with carbon, and comprises the following step of: S1, selecting lithium iron phosphate particles, and selecting 3000-3600 mesh; S2, putting the selected lithium iron phosphate particles into a magneticseparator to remove the iron element in the lithium iron phosphate particles; S3, passing the magnetically separated lithium iron phosphate particles into a mixed solution of silver fluoride and hydrogen fluoride, replacing the active metal impurities, acidifying the metal oxides, filtering, and drying to obtain an intermediate product; S4, separating the intermediate product obtained in S3 by a color sorter; S5, pre-sintering the obtained lithium iron phosphate particles in S4; S6. Sintering the S5 pre-sintered lithium iron phosphate particles and graphene under non-oxidation conditions, andcooling to obtain carbon-coated lithium iron phosphate material. Reduce the impurity content of LiFePO4 cathode material, improve the quality of lithium battery.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for processing lithium iron phosphate, a cathode material of a power lithium battery. Background technique [0002] Lithium iron phosphate has become the preferred cathode material for lithium power batteries because of its excellent safety performance and excellent cycle performance. In addition, it is also widely used in UPS power systems for mobile phones, notebook computers, digital cameras and a large number of other emerging IT products; due to lithium The cost of the battery is more than twice that of the traditional lead-acid battery, so it is limited in large-scale promotion. For the lithium iron phosphate battery system, the cost of lithium iron phosphate accounts for about 20% of the cost of lithium batteries (calculated based on the current average selling price of 150,000 in the market). [0003] There are generally two production routes for lithium iron ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 李荣武
Owner 新疆舰目摩托车有限公司
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