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A kind of lithium iron phosphate battery and preparation method thereof

A lithium iron phosphate battery and lithium iron phosphate technology, applied in battery electrodes, secondary batteries, battery pack components, etc., can solve problems such as fast cycle life decay, low platform voltage, and slow diffusion of lithium ions

Active Publication Date: 2020-07-07
江西省汇亿新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, new energy systems with high capacity, high rate and long life are demanded in the market. Due to the poor conductivity of lithium iron phosphate itself, the slow diffusion of lithium ions causes the disadvantages of low platform voltage and fast cycle life decay when the battery is charged and discharged at high rates. , cannot meet the needs of the existing technology, so it is necessary to develop a high-rate, high-safety, long-life lithium iron phosphate battery

Method used

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  • A kind of lithium iron phosphate battery and preparation method thereof
  • A kind of lithium iron phosphate battery and preparation method thereof
  • A kind of lithium iron phosphate battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation method of lithium iron phosphate in the present embodiment comprises the following steps:

[0052] S11, ferric orthophosphate and Fe 3 o 4 Mix according to the mass ratio of 3:1 to form a composite iron source, add it to the ball mill, then add deionized water to mix, and ball mill at a speed of 200r / min for 1h. The amount of ionized water added is ferric orthophosphate and Fe 3 o 4 40 of the total mass;

[0053] S12. Add lithium carbonate and carbon nanotubes to the ball mill in step S11, and continue to add ethanol to mix ball milling for 2 hours. After ball milling, the slurry particle size D50 is controlled at 1-1.5 μm; wherein, the mass ratio of lithium carbonate, carbon nanotubes, and composite iron source For 20:10:20, the addition of ethanol is lithium carbonate, 20% of the total mass of carbon nanotubes;

[0054] S13. Vacuum dry the slurry in step S12 at 90°C, pre-calcine the dried material at 600°C for 4 hours, and protect the whole proces...

Embodiment 2

[0073] The preparation method of lithium iron phosphate in the present embodiment comprises the following steps:

[0074] S11, ferric orthophosphate and Fe 3 o 4 Mix according to the mass ratio of 3.5:1 to form a composite iron source, add it to the ball mill, then add deionized water to mix, and ball mill at a speed of 250r / min for 2h, and the particle size D50 of the slurry after ball milling is controlled at 1-1.5μm; among them, deionized water The addition amount is ferric orthophosphate and Fe 3 o 4 45% of the total mass;

[0075] S12. Add lithium carbonate and carbon nanotubes to the ball mill in step S11, and continue to add ethanol to mix ball milling for 3 hours. After ball milling, the slurry particle size D50 is controlled at 1-1.5 μm; wherein, the mass ratio of lithium carbonate, carbon nanotubes, and composite iron source For 21:11:21, the addition of ethanol is lithium carbonate, 25% of the total mass of carbon nanotubes;

[0076] S13. Vacuum-dry the slurry ...

Embodiment 3

[0095] The preparation method of lithium iron phosphate in the present embodiment comprises the following steps:

[0096] S11, ferric orthophosphate and Fe 3 o 4 Mix according to the mass ratio of 4:1 to form a composite iron source, add it to a ball mill, then add deionized water to mix, and ball mill at a speed of 300r / min for 3 hours, and the particle size D50 of the slurry after ball milling is controlled at 1-1.5μm; among them, deionized water The addition amount is ferric orthophosphate and Fe 3 o 4 50% of the total mass;

[0097] S12. Add lithium carbonate and carbon nanotubes to the ball mill in step S11, and continue to add ethanol to mix ball milling for 4 hours. After ball milling, the slurry particle size D50 is controlled at 1-1.5 μm; wherein, the mass ratio of lithium carbonate, carbon nanotubes, and composite iron source For 22:12:22, the addition of ethanol is lithium carbonate, 30% of the total mass of carbon nanotubes;

[0098] S13. Vacuum-dry the slurry...

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Abstract

The invention discloses a lithium iron phosphate battery and a preparation method thereof, and relates to the field of lithium batteries. The positive electrode slurry of the battery adopts lithium iron phosphate, conductive carbon black, carbon nanotubes, polyvinylidene fluoride, and N-methylpyrrolidone; The positive current collector is made of carbon-coated aluminum foil; the negative electrode slurry is made of artificial graphite composite material, conductive carbon black, thickener CMC, and binder SBR; the negative electrode current collector is made of microporous copper foil; the electrolyte is lithium hexafluorophosphate organic solvent electrolyte, injected The liquid volume is 6.0~6.2g; the diaphragm adopts ceramic coating diaphragm. The beneficial effect of the invention is that the lithium iron phosphate battery prepared by the invention has high rate performance, high safety and long service life.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion secondary batteries, in particular to a lithium iron phosphate battery and a preparation method thereof. Background technique [0002] As a new generation of secondary batteries, lithium-ion batteries are considered to be the most promising secondary batteries. Compared with secondary batteries such as traditional lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have many advantages such as high operating voltage, long cycle life, high energy density, and no memory function. Since the emergence of lithium-ion batteries in the 1990s, with the continuous development and progress of lithium-ion battery materials and key technologies, they have been widely used in electronic products, new energy vehicles, aerospace and other fields. [0003] At present, domestic lithium-ion battery cathode materials are mainly concentrated in l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/58H01M4/587H01M4/66H01M2/16H01M10/0587H01M50/431
CPCH01M4/5825H01M4/587H01M4/661H01M10/0525H01M10/0587H01M2004/027H01M2004/021H01M2004/028H01M50/431Y02E60/10Y02P70/50
Inventor 廖宗江江涛邹晓兵
Owner 江西省汇亿新能源有限公司