A kind of negative electrode material of lithium-ion power battery and preparation method thereof

A power battery and negative electrode material technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low conductivity, weak battery life, poor safety, etc., and achieve improved electrochemical performance, improved electrical conductivity, The effect of small contact resistance

Inactive Publication Date: 2021-07-20
中溢集团(吉林)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion power batteries have the advantages of long cycle life and high energy density, and are widely used in the field of new energy vehicles. However, due to their weak battery life and poor safety, they have always been a more important technical direction in the field of new energy research.
[0004] The many advantages of lithium titanate determine that it has excellent cycle performance and high safety. However, its conductivity is not high, and the capacity decays seriously when charging and discharging with high current. Surface modification or doping is usually used to improve its conductivity. performance

Method used

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  • A kind of negative electrode material of lithium-ion power battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] It is weighed 2G containing two different fiber diameter distribution of carbon fibers, including the fiber diameter distribution of 90%, and the diameter range of 5-30 nm range of carbon fibers A1 and the fiber diameter distributed in 90%, the diameter ranges from 50- The carbon fiber A2 of the 90 nm range is compared to 60% of the total mass of carbon fibers A1, which disperses the carbon fibers weighed above to 6 m, at 80 ° C, heat reflows for 12 h, then centrifugally, deionized After the water was rinsed 5-6 times, the ultrasonic dispersed into ethanol to obtain a dispersion of negative charge carbon fibers.

[0031] 62 g of titanate titanate was weeded to the above carbon fiber dispersion, and the reaction was stirred at 70 ° C for 8 h, and the emulsion was obtained, and then placed at a vacuum drying tank at 100 ° C for one day and night to give titanium dioxide / carbon fiber. It is weighed with 1 5.39 g of lithium carbonate, and it is mixed with the obtained titaniu...

Embodiment 2

[0034] It is weighed 2G containing two carbon fibers containing two different fiber diameter distributions, including the fiber diameter distribution of 90% or more, the diameter range of 5-30 nm range of carbon fibers A1 and the fiber diameter distribution in a diameter range of 50-90 nm The range of carbon fiber A2, wherein the ratio is 70% of the total mass of carbon fiber A1, which dispersed above the carbon fibers above 6 m, and heats refluxed at 80 ° C, then centrifugally, dispelled with deionized water. After washing 5-6 times, the ultrasonic dispersed into ethanol to obtain a dispersion of negative charge carbon fibers.

[0035] 62 g of titanate titanate was weeded to the above carbon fiber dispersion, and the reaction was stirred at 70 ° C for 8 h, and the emulsion was obtained, and then placed at a vacuum drying tank at 100 ° C for one day and night to give titanium dioxide / carbon fiber. It is weighed with 1 5.39 g of lithium carbonate, and it is mixed with the obtaine...

Embodiment 3

[0038] It is weighed 2G containing two carbon fibers containing two different fiber diameter distributions, including the fiber diameter distribution of 90% or more, the diameter range of 5-30 nm range of carbon fibers A1 and the fiber diameter distribution in a diameter range of 50-90 nm The range of carbon fiber A2, wherein the ratio is 85% of the total mass of carbon fiber A1, which dispersed above the carbon fibers above 6m nitric acid solution, at 80 ° C, refluxed at 80 ° C, then centrifugally, deionized water After washing 5-6 times, the ultrasonic dispersed into ethanol to obtain a dispersion of negative charge carbon fibers.

[0039] 62 g of titanate titanate was weeded to the above carbon fiber dispersion, and the reaction was stirred at 70 ° C for 8 h, and the emulsion was obtained, and then placed at a vacuum drying tank at 100 ° C for one day and night to give titanium dioxide / carbon fiber. It is weighed with 1 5.39 g of lithium carbonate, and it is mixed with the ob...

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Abstract

The invention provides a negative electrode material for a lithium-ion power battery and a preparation method thereof, which is to in-situ composite two kinds of carbon fibers with different fiber diameter distributions and lithium titanate, and then coat a layer of carbonized porous nitrogen on the surface of the composite material. doped carbon layer. Through the above preparation, the conductivity, initial capacity and cycle stability of the negative electrode material are effectively improved.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion power cell anode material, and more particularly to a lithium ion power battery anode material and a preparation method thereof. Background technique [0002] Lithium-ion power cells have the advantages of a circulating life and high energy density, and are widely used in new energy vehicles, but currently due to problems such as weak endurance, failure of safety, the difference in the technical direction of the new energy sector. [0003] The spinel titanate is used as a negative electrode material that is attained, which is advantageous: 1) Lithium titanate is almost zero and after deintercalating lithium; 2) The lithium potential is higher (1.55V), which can be effective Avoid production of lithium derivatives, high safety; 3) has a very flat voltage platform; 4) High chemical diffusion coefficient and Cullen efficiency. [0004] Many advantages of lithium titanate determine its excellen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M10/0525H01M4/02
CPCH01M4/362H01M4/366H01M4/485H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 关宝树蔺长银刘光平卢昌琴
Owner 中溢集团(吉林)新能源科技有限公司
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