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High-capacity high-power ferrous phosphate lithium power battery and manufacturing method thereof

A technology of lithium iron phosphate and its manufacturing method, which is applied in the direction of battery electrodes, secondary batteries, and final product manufacturing, and can solve the problems of low electronic conductivity and ion diffusion coefficient, poor high-rate charge-discharge performance, and low charge-discharge efficiency. Advanced problems, to achieve the effect of reducing the internal resistance of the battery, superior cycle performance, and solving the effects of gas inflation

Active Publication Date: 2011-09-21
江苏海四达电源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, lithium iron phosphate materials have two shortcomings. One is the low electronic conductivity and ion diffusion coefficient, resulting in poor high-rate charge and discharge performance, and the other is low tap density, resulting in low volume specific capacity.
Moreover, if the lithium iron phosphate power battery is manufactured by traditional technology, the internal resistance of the battery itself is relatively large. Under the condition of high current charge and discharge, the charge and discharge efficiency is not high, and the temperature rise of the battery is large, so the power battery should minimize the internal resistance

Method used

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  • High-capacity high-power ferrous phosphate lithium power battery and manufacturing method thereof
  • High-capacity high-power ferrous phosphate lithium power battery and manufacturing method thereof
  • High-capacity high-power ferrous phosphate lithium power battery and manufacturing method thereof

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Embodiment 1

[0023] Taking the manufacture of 1882130 type 10Ah square lithium iron phosphate battery as an example, the selected tap density is 1-1.5g / cm 3 , the specific surface area is greater than 15m 2 / g,D 50 With 3-8μm lithium iron phosphate as the positive electrode material, add 2% conductive graphite accounting for its weight percentage, place it in a closed container with an inert protective gas and stir at high speed, and spray N-methylpyrrolidone solvent at the same time. The total amount of solvent added is 2% of the powder weight, and the duration is 20 minutes.

[0024] 97% by weight of the positive electrode active material, 3% of polyvinylidene fluoride, and N-methylpyrrolidone solvent accounting for 90% of the solid content are added and mixed evenly to make a positive electrode slurry, and the positive electrode slurry is coated on After being dried at a temperature of 80-100° C. on a metal aluminum foil with a thickness of 18 μm, it is rolled into a positive electrod...

Embodiment 2

[0029] Taking the manufacture of 1882130 type 10Ah square lithium iron phosphate battery as an example, the selected tap density is 1-1.5g / cm 3 , the specific surface area is greater than 15m 2 / g,D 50 With 3-8μm lithium iron phosphate as the positive electrode material, after adding 1% carbon nanotube material and 1% conductive graphite accounting for its weight percentage, it is placed in a closed container with an inert protective gas and stirred at high speed, while spraying N-methylpyrrolidone solvent, the total amount of the sprayed solvent is 3% of the powder weight, and the duration is 20 minutes.

[0030] 98% by weight of the positive electrode active material, 2% of polyvinylidene fluoride, and N-methylpyrrolidone solvent accounting for 96% of the solid content are added and mixed evenly to make a positive electrode slurry, and the positive electrode slurry is coated on After being dried at a temperature of 80-100° C. on a metal aluminum foil with a thickness of 18...

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Abstract

The invention discloses a high-capacity high-power ferrous phosphate lithium power battery and a manufacturing method thereof, relating to the technical field of lithium ion secondary batteries. The battery comprises a positive plate, a negative plate, a diaphragm, electrolyte and a battery shell, wherein the positive plate is formed by coating positive slurry on a aluminum foil; the negative plate is formed by coating negative slurry on a copper foil; the positive slurry comprises a positive active material, a bonder and the like; the negative slurry comprises MCMBs (mesocarbon microbeads), a conductive agent, a bonder and the like; and the battery shell comprises a shell and a nut cap. According to the invention, lithium iron phosphate positive material is pretreated, thus improving the electroconductibility of the material and the processing performance of the slurries. By means of an optimal structure design, the battery has the advantages of high capacity and lower internal resistance; and the battery can perform large current charge and discharge, has low temperature rise, and is mainly used as a power supply of an electric vehicle.

Description

【Technical field】 [0001] The invention relates to a method for manufacturing a large-capacity and high-power lithium iron phosphate power battery. It belongs to the technical field of lithium-ion secondary battery manufacturing. The battery includes a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte and a battery case. The positive electrode sheet is composed of aluminum foil coated with positive electrode slurry, and the negative electrode sheet is composed of copper foil coated with negative electrode slurry. The diaphragm is polypropylene or polyethylene with microporosity or three-layer polypropylene / polyethylene / polypropylene composite film. The battery case is composed of a stainless steel shell and a cap. The cap has an explosion-proof membrane in the middle and a liquid injection hole on the side. 【Background technique】 [0002] At present, most electric vehicles on the market use lead-acid batteries and nickel-metal hydride batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/136H01M10/0585
CPCY02E60/12Y02E60/122Y02T10/7011Y02E60/10Y02P70/50
Inventor 沈晓彦唐琛明周建新王兴威沙永香
Owner 江苏海四达电源有限公司
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