High-temperature cycle lithium iron phosphate power battery and manufacturing method thereof

A lithium iron phosphate and power battery technology, which is applied in the high-temperature cycle lithium iron phosphate power battery and its manufacturing field, can solve the problems of increasing resistance of electrodes, attenuation of battery capacity, intensified electrode polarization, etc., so as to reduce internal resistance and reduce Polarization, the effect of less lithium ions

Active Publication Date: 2019-12-03
江苏海四达电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary batteries are used in high-temperature environments. The increase in electrode polarization during charging is the main reason for the rapid decline of battery capacity at high temperatures. Under high-temperature conditions, the charge transfer resistance increases and the electrodes are deformed due to the generation of a large amount of gas, which reduces the discharge capacity. further attenuation

Method used

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  • High-temperature cycle lithium iron phosphate power battery and manufacturing method thereof
  • High-temperature cycle lithium iron phosphate power battery and manufacturing method thereof
  • High-temperature cycle lithium iron phosphate power battery and manufacturing method thereof

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preparation example Construction

[0030] The present invention also provides a method for preparing a positive electrode of a lithium battery, comprising the following steps:

[0031] 1), uniformly mixing the positive electrode active material, conductive agent and binder in a vacuum mixer to obtain the positive electrode material;

[0032] 2), uniformly mix the positive electrode material and the first part of the organic solvent to obtain the positive electrode paste 1;

[0033] 3) Mix the positive electrode paste 1 and the second part of the organic solvent evenly to obtain the positive electrode paste 2;

[0034] 4) Add the remaining organic solvent into the positive electrode paste 2, adjust the viscosity to 6300-7800mPa·s, pass through a 120-150 mesh sieve to obtain the positive electrode slurry;

[0035] 5) Coating the sieved positive electrode slurry on at least one side of the positive electrode current collector, drying, rolling, slitting, and sheeting to obtain the lithium battery positive electrod...

Embodiment 1

[0078] 1. Preparation of positive electrode

[0079] 95.5kg carbon-coated lithium iron phosphate material (D50 is 3μm, tap density is 1.1g / cm 3 , The specific surface area is 9.2m 2 / g), 0.5kg conductive carbon black, 1kg carbon nanotubes, 2.5kg PVDF 5130 in a vacuum oven with a vacuum degree ≤ -0.08MPa, bake at 120°C for 300min;

[0080] Add the above-mentioned carbon-coated lithium iron phosphate material, conductive carbon black, and carbon nanotubes into a vacuum mixer, and stir for 60 minutes at a speed of 25 r / min to obtain the positive electrode material;

[0081] Stir the above positive electrode material and 30kg of N-methylpyrrolidone (NMP) evenly in a vacuum mixer to obtain a positive electrode slurry paste 1, wherein the stirring rate is 1800r / min, the stirring time is 90min, and the stirring temperature is 40°C;

[0082] Stir positive electrode paste 1 and 30kg NMP evenly in a vacuum mixer to obtain positive electrode paste 2, wherein the stirring rate is 2200r / ...

Embodiment 2

[0095] According to the method of Example 1, the difference is that the preparation method of the positive electrode is as follows:

[0096] 96kg carbon-coated lithium iron phosphate material (D50 is 2μm, tap density is 1.0g / cm 3 , The specific surface area is 9.6m 2 / g), 1kg conductive carbon black, 1.5kg graphene, 1.5kg PVDF 5130 in a vacuum oven with a vacuum degree ≤ -0.08MPa, bake at 120°C for 300min;

[0097] Add the above-mentioned carbon-coated lithium iron phosphate material, conductive carbon black, graphene, and PVDF 5130 into a vacuum mixer, and stir at a speed of 30r / min for 75min to obtain the positive electrode material;

[0098] Stir the above positive electrode material and 24kg of N-methylpyrrolidone (NMP) evenly in a vacuum mixer to obtain a positive electrode paste 1, wherein the stirring rate is 1600r / min, the stirring time is 60min, and the stirring temperature is 30°C;

[0099] Stir positive electrode paste 1 and 24kg NMP in a vacuum mixer evenly to ob...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a high-temperature cycle lithium iron phosphate power battery and a manufacturing method thereof. The high-temperature cycle lithium iron phosphate power battery includes a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the positive electrode includes a positive electrode current collector and a battery. The positive electrode material coated on the positive electrode current collector, the positive electrode material includes carbon-coated lithium iron phosphate material, the particle size distribution D50 of the carbon-coated lithium iron phosphate material is 1-5 μm; the lithium iron phosphate The tap density is 0.9~1.3g / cm 3 ; The specific surface area of ​​the lithium iron phosphate is 7.5~11.3m 2 / g; the negative electrode includes a negative electrode current collector and a negative electrode material coated on the negative electrode current collector, the negative electrode material includes mesocarbon microspheres, and the particle size distribution D50 of the mesocarbon microspheres is 3.6 to 8.5 μm , its tap density is 0.9~1.3g / cm 3 , its specific surface area is 1.2~1.7m 2 / g. The invention reduces the polarization of the electrode by adjusting the particle size of the positive and negative active materials, and improves the charging and discharging performance and cycle performance of the lithium battery at high temperature.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-temperature cycle lithium iron phosphate power battery and a manufacturing method thereof. Background technique [0002] At present, there are more and more pure electric vehicle products sold in the domestic new energy vehicle market, but the vast majority of pure electric vehicles have the problem of rapid mileage decay in high temperature days. Studies have shown that when the temperature rises from 25°C to 40°C, the actual temperature inside the car is much higher than 40°C. After the temperature rises, the lithium-ion battery shows a higher initial capacity, but the cycle stability of the battery decreases and the capacity decays. Speed ​​up. Therefore, high temperature performance is particularly important as an important indicator for considering the environmental applicability of batteries. Ordinary batteries are used in high-temperature environments. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525H01M4/36H01M4/58H01M4/583H01M4/1393H01M4/1397
CPCH01M4/1393H01M4/1397H01M4/366H01M4/5825H01M4/583H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 沈晓彦黄佳俊顾敏捷胡丹丹
Owner 江苏海四达电源有限公司
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