Lithium iron phosphate positive electrode material, preparation method thereof and lithium ion battery

A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of batteries, battery electrodes, secondary batteries, etc., can solve the problems of poor cycle performance and low compaction density, so as to improve production efficiency, improve compaction performance, and promote long-term big effect

Inactive Publication Date: 2020-04-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Abstract
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Problems solved by technology

[0004] In view of this, it is necessary for the present invention to provide a lithium iron phosphate positive electrode material and a preparation method thereof and a lithium ion battery, by introducing lithium titanate as a flux during the preparation process to promote the growth of the grain size during the s

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  • Lithium iron phosphate positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0025] The embodiment of the present invention discloses a preparation method of lithium iron phosphate positive electrode material, comprising the following steps:

[0026] Stir the deionized water, iron phosphate, lithium carbonate and glucose evenly to obtain a mixed slurry;

[0027] Grinding the mixed slurry once to obtain coarsely ground slurry, and then performing secondary grinding to obtain finely ground slurry;

[0028] performing centrifugal spray drying on the finely ground slurry to obtain a dry material, and mixing the dry material with lithium titanate to obtain a lithium iron phosphate precursor;

[0029] Carrying out solid phase sintering of the lithium iron phosphate precursor in a nitrogen atmosphere to obtain a lithium iron phosphate sintered body;

[0030] The lithium iron phosphate sintered body is subjected to jet crushing and classification to obtain the lithium iron phosphate cathode material.

[0031] In a further scheme, in some embodiments of the p...

Embodiment 1

[0041] Add 20kg of deionized water into the stirring tank, then add 10kg of iron phosphate, 2.45kg of lithium carbonate, and 1kg of glucose, stir and disperse evenly to obtain a mixed slurry with a solid content of 37.23%;

[0042] Transferring the mixed slurry to a coarse grinding mill for primary grinding to obtain a coarse grinding slurry, wherein the particle size of the coarse grinding slurry is D50=21 μm, D97=75 μm;

[0043] Transferring the coarsely ground slurry to a fine grinding mill for secondary grinding to obtain a finely ground slurry, wherein the particle size of the finely ground slurry is D10=236nm, D50=524nm, D97=2.11 μm;

[0044] performing centrifugal spray drying on the finely ground slurry to obtain dry material;

[0045] The dry material is mixed with lithium titanate at a mass ratio of 1:0.005 and uniformly coated to obtain a lithium iron phosphate precursor;

[0046] The lithium iron phosphate precursor is subjected to high-temperature solid-state sin...

Embodiment 2

[0049] Add 15kg of deionized water into the stirred tank, then add 10kg of ferric phosphate, 2.52kg of lithium carbonate, and 1.1kg of glucose, stir and disperse evenly to obtain a mixed slurry with a solid content of 43.75%;

[0050] The mixed slurry was transferred to a coarse sand mill for primary grinding to obtain a coarsely ground slurry, wherein the particle size of the coarsely ground slurry was D50=20 μm and D100=73 μm.

[0051] Transferring the coarsely ground slurry to a fine grinding mill for secondary grinding to obtain a finely ground slurry, wherein the particle size of the finely ground slurry is D10=231nm, D50=603nm, D97=1.96 μm;

[0052] performing centrifugal spray drying on the finely ground slurry to obtain dry material;

[0053] The dry material is mixed with lithium titanate at a mass ratio of 1:0.003 and uniformly coated to obtain a lithium iron phosphate precursor;

[0054]The lithium iron phosphate precursor is subjected to high-temperature solid-sta...

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Abstract

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the steps of uniformly stirring deionized water, iron phosphate, lithium carbonate and glucose to obtain mixed slurry; carrying out primary grinding on the mixed slurry to obtain coarse grinding slurry, and then carrying out secondary grinding to obtain fine grinding slurry; carrying out centrifugal spray drying on the finely ground slurry to obtain a dry material, and mixing the dry material with lithium titanate to obtain a lithium iron phosphate precursor; carrying out solid-phase sintering on the lithium iron phosphate precursor in a nitrogen atmosphere to obtain a lithium iron phosphate sintered body; and carrying out air jet pulverization and grading on the lithium iron phosphate sintered body to prepare the lithium iron phosphate positive electrode material. The lithium iron phosphate positive electrode material prepared by the method has relatively high compaction density and excellent cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a lithium iron phosphate cathode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high power density, and long cycle life, and are widely used in electric vehicles, mobile phones, notebook computers, camcorders, and other electric equipment. The four key materials of lithium-ion batteries are positive electrode material, negative electrode material, diaphragm and electrolyte. Among them, the positive electrode material occupies a large proportion in lithium-ion batteries. Therefore, the performance of positive electrode materials directly determines the performance of lithium-ion batteries. . [0003] Commonly used lithium-ion battery cathode materials are generally variable-valence metal compounds containing lithium. Currently, the widely us...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/62H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 屈杨
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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