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High-compaction spherical lithium iron phosphate, preparation method and lithium ion battery containing high-compaction spherical lithium iron phosphate

A lithium iron phosphate, high-pressure compaction technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of poor carbon film integrity, easy to fall off, low compaction density, low solid content, etc., and achieve improvement Compacted density, improved compacted density, good ductility

Inactive Publication Date: 2019-03-22
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high-pressure compacted spherical lithium iron phosphate prepared by the present invention solves the problems of difficulty in dispersion, low efficiency, low solid content, and high energy consumption in the homogenization process of lithium iron phosphate prepared by the crushing process on the market, and solves the problems of ordinary spherical lithium iron phosphate at the same time. Problems of low solid density and poor integrity of the carbon film coated in the prior art and easy to fall off

Method used

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  • High-compaction spherical lithium iron phosphate, preparation method and lithium ion battery containing high-compaction spherical lithium iron phosphate
  • High-compaction spherical lithium iron phosphate, preparation method and lithium ion battery containing high-compaction spherical lithium iron phosphate
  • High-compaction spherical lithium iron phosphate, preparation method and lithium ion battery containing high-compaction spherical lithium iron phosphate

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Embodiment 1

[0050] A method for preparing a high-compact spherical lithium iron phosphate positive electrode material, comprising the following steps:

[0051] (1) Weigh iron phosphate, ammonium phosphate and lithium carbonate according to the molar ratio of Fe:P:Li=1:1.04:1.02, dissolve them in deionized water to form a mixed solution, and in the mixed solution, iron phosphate, ammonium phosphate and carbonic acid The concentrations of lithium were 1.536mol / L, 0.062mol / L, and 1.567mol / L;

[0052] (2) Glucose was dissolved in the obtained mixed solution according to 7.5% of the total salt mass, and sand-milled for 3 hours to obtain a precursor slurry with a particle size of D50=0.5 μm and D90=1.2 μm;

[0053] (3) The precursor slurry obtained in step (2) is dried and granulated in a pressure spray drying tower, and the granulation particle size is controlled to D50=5 μm, D90=10 μm, under the protection of argon, the temperature rise of 1 ° C / min The rate of heating is increased to 700°C ...

Embodiment 2

[0055] A method for preparing a high-compact spherical lithium iron phosphate positive electrode material, comprising the following steps:

[0056] (1) Weigh ferric sulfate, ammonium dihydrogen phosphate and lithium carbonate according to the molar ratio of Fe:P:Li=1:1.05:1.02, dissolve them in deionized water to form a mixed solution, and in the mixed solution, iron sulfate, diphosphate The concentrations of ammonium hydrogen and lithium carbonate are 0.682mol / L, 0.716mol / L, and 0.695mol / L, respectively;

[0057] (2) Dissolve polyethylene glycol in the mixed solution obtained above by 4.5% of the total salt mass, and carry out sand grinding for 2 hours to obtain a precursor slurry with a particle size of D50=0.6 μm and D90=1.5 μm;

[0058] (3) The precursor slurry obtained in step (2) is dried and granulated in a pressure spray drying tower, and the granulation particle size is controlled to D50=4 μm, D90=15 μm, under the protection of argon, the temperature rise of 1 ° C / min...

Embodiment 3

[0060] A method for preparing a high-compact spherical lithium iron phosphate positive electrode material, comprising the following steps:

[0061] (1) Weigh ferric nitrate, diammonium hydrogen phosphate and lithium carbonate according to the molar ratio of Fe:P:Li=1:1.03:1.02, dissolve them in deionized water to form a mixed solution, and in the mixed solution, ferric nitrate, hydrogen phosphate The concentrations of diammonium and lithium carbonate were 2.245mol / L, 2.313mol / L, and 2.29mol / L, respectively;

[0062] (2) Dissolve sucrose in the mixed solution obtained above by 5% of the total salt mass, and carry out sand grinding for 1 hour to obtain a precursor slurry with a particle size of D50=0.8 μm and D90=1.6 μm;

[0063] (3) The precursor slurry obtained in step (2) is dried and granulated in a pressure spray drying tower, and the granulation particle size is controlled to D50=7 μm, D90=18 μm, under the protection of argon, the temperature rise of 1°C / min The rate of h...

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Abstract

The invention discloses high-compaction spherical lithium iron phosphate, a preparation method and a lithium ion battery containing the high-compaction spherical lithium iron phosphate. The method comprises the following steps that 1) a carbon source, iron salt, phosphate salt and lithium salt mixed aqueous solution is prepared, and sand grinding is carried out until D50 is equal to 0.5-1 microns,and D90 is equal to 1.2-2.3 microns; 2) obtained precursor slurry is dried and granulated in a pressure type spray drying device, and the particle size of granulation is controlled to be as follows:D50 is equal to 4-8 microns, and D90 is equal to 10-25 microns; and 3) sintering is carried out under the protection of inert gas so as to obtain the high-compaction spherical lithium iron phosphate.According to the high-compaction spherical lithium iron phosphate, the preparation method and the lithium ion battery containing the high-compaction spherical lithium iron phosphate, the high-compaction spherical lithium iron phosphate is good in ductility, the compaction density of a prepared pole piece is 2.45 g / cm<3> or above, the problems that in the prior art, lithium iron phosphate preparedthrough a crushing technology in the current market is not easy to disperse in the homogenizing process, the efficiency is low, the solid content is low, the energy consumption is high and the like can be solved, and meanwhile, the problems that the compaction density of common spherical lithium iron phosphate is relatively low, and the integrity of a coated carbon film in the prior art is poor and is liable to fall off can be solved.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, and relates to a high-compression spherical lithium iron phosphate, a preparation method and a lithium ion battery comprising the same. Background technique [0002] Due to the advantages of high voltage, high energy density, good cycle performance, no memory effect, and green environmental protection, lithium-ion batteries have attracted more and more attention and extensive research by scholars. The research is of great significance for the further application of lithium-ion batteries. Compared with other cathode materials, lithium iron phosphate has a larger specific surface area and small particles (especially lithium iron phosphate prepared by centrifugal spray-pulverization process), which makes it difficult to disperse during processing and use, and has low solid content, resulting in uniformity. The pulp efficiency is low and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45C01P2004/32C01P2006/10H01M4/5825H01M10/0525Y02E60/10
Inventor 吴永生
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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