High-rate high-safety long-life lithium iron phosphate battery and preparation method thereof

A technology of lithium iron phosphate battery and lithium iron phosphate, which is applied in the direction of secondary batteries, battery electrodes, battery pack components, etc., can solve the problems of poor electrical conductivity of lithium iron phosphate, fast cycle life attenuation, and slow diffusion of lithium ions, etc., to achieve Improved high-rate performance, reduced diffusion resistance, and the effects of multiple migration channels

Active Publication Date: 2019-04-26
江西省汇亿新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • High-rate high-safety long-life lithium iron phosphate battery and preparation method thereof
  • High-rate high-safety long-life lithium iron phosphate battery and preparation method thereof
  • High-rate high-safety long-life lithium iron phosphate battery and preparation method thereof

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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 high-rate high-safety long-life lithium iron phosphate battery and a preparation method thereof, and relates to the field of lithium batteries. Anode slurry of the battery uses lithium iron phosphate, conductive carbon black, carbon nanotube, polyvinylidene fluoride and N-methylpyrrolidone; an anode current collector adopts a carbon coated aluminum foil; cathode slurry uses artificial graphite composite material, conductive carbon black, thickener CMC and binder SBR; a cathode current collector uses a microporous copper foil; an electrolyte adopts a lithium hexafluorophosphate organic solvent electrolyte with the liquid injection amount of 6.0-6.2 g; a diaphragm adopts a ceramic coating diaphragm. The lithium iron phosphate battery has the advantages of high rateperformance, high use 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 high-rate, high-safety, long-life 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 mate...

Claims

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Application Information

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Patent Type & Authority Applications(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
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