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Grafted ceramic powder and preparation method thereof, ceramic diaphragm and preparation method thereof, lithium ion battery, battery module and battery pack

A lithium-ion battery, ceramic powder technology, applied in battery pack parts, secondary batteries, circuits, etc., can solve problems such as poor stability of ceramic separators

Active Publication Date: 2021-03-19
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problem of poor stability of existing ceramic diaphragms, and provide grafted ceramic powders and preparation methods, ceramic diaphragms and preparation methods, lithium-ion batteries, battery modules and battery packs

Method used

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  • Grafted ceramic powder and preparation method thereof, ceramic diaphragm and preparation method thereof, lithium ion battery, battery module and battery pack
  • Grafted ceramic powder and preparation method thereof, ceramic diaphragm and preparation method thereof, lithium ion battery, battery module and battery pack
  • Grafted ceramic powder and preparation method thereof, ceramic diaphragm and preparation method thereof, lithium ion battery, battery module and battery pack

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preparation example Construction

[0053] The second aspect of the present invention provides a preparation method of grafted ceramic powder, comprising:

[0054] (1) mixing the ceramic powder with a dispersant to obtain a ceramic powder dispersion;

[0055] (2) Carrying out a grafting reaction between the grafted polyolefin and the ceramic powder dispersion, so that the grafted polyolefin is grafted on the surface of the ceramic powder;

[0056] (3) Filtering the reaction product obtained in step (2), washing and drying the obtained solid to obtain a grafted ceramic powder.

[0057] In the present invention, preferably, in step (1), the dispersant is selected from ethyl acetate, toluene, xylene, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl One or more of sulfoxide and nitrogen methylpyrrolidone.

[0058] In the present invention, preferably, in the ceramic powder dispersion, the solid content of the ceramic powder is 10-40wt%.

[0059] In the present invention, preferably, in step (2), the grafted...

Embodiment 1

[0115] Preparation of grafted ceramic powder:

[0116] (1) 80g of rod-shaped alumina (one-dimensional nanomaterials, aspect ratio of about 80-100:1, diameter of about 300-500nm, curvature of about 30-40cm / m, first dried at 60°C for 24h) and 120g of two Toluene is mixed to obtain ceramic powder dispersion (solid content is 40wt%);

[0117] (2) Add 2g of maleic anhydride grafted polyethylene (the weight average molecular weight is about 15000, and the grafting rate is about 1.0wt%) into 200mL of xylene for ultrasonic dissolution (the amount of maleic anhydride grafted polyethylene is rod-shaped oxidation 0.1wt% of aluminum), and then carry out the grafting reaction with the ceramic powder dispersion for 30min under a water bath condition of 40°C;

[0118] (3) The reaction product obtained by the grafting reaction was centrifugally filtered, and the obtained solid was washed several times with ethanol, and dried at 120° C. for 8 hours to obtain grafted rod-shaped alumina, which ...

Embodiment 2

[0125] Preparation of grafted ceramic powder:

[0126] (1) 20g of rod-shaped alumina (one-dimensional nanomaterials, aspect ratio of about 4-20:1, diameter of about 20-100nm, curvature of about 1-10cm / m, first dried at 60°C for 8h) and 180g of N,N-dimethylformamide is mixed to obtain a ceramic powder dispersion (solid content is 10wt%);

[0127] (2) 2g maleic anhydride grafted polyethylene (the weight-average molecular weight is about 10000, and the grafting rate is about 1.3wt%) is added into 200 mL of N-methylpyrrolidone for ultrasonic dissolution (the consumption of maleic anhydride grafted polyethylene is 10wt% of rod-shaped alumina), and then carry out grafting reaction with the ceramic powder dispersion for 30min under a water bath condition of 60°C;

[0128] (3) The reaction product obtained by the grafting reaction was centrifugally filtered, and the obtained solid was washed several times with ethanol, and dried at 120° C. for 10 h to obtain grafted rod-shaped alumin...

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Abstract

The invention relates to the field of ceramic diaphragms for lithium ion batteries, and discloses grafted ceramic powder, a preparation method of the grafted ceramic powder, a ceramic diaphragm, a preparation method of the ceramic diaphragm, a lithium ion battery, a battery module and a battery pack. The grafted ceramic powder comprises a ceramic nanomaterial and grafted polyolefin grafted on thesurface of the ceramic nanomaterial. The grafted ceramic powder is a one-dimensional rod-like material, has a modified surface, and can provide a more stable and uniform ceramic coating. The preparedceramic diaphragm is beneficial to improving the cycle performance of the lithium ion battery and the high-rate discharge performance of the battery.

Description

technical field [0001] The invention relates to the field of ceramic diaphragms for lithium ion batteries, in particular to grafted ceramic powders and preparation methods, ceramic diaphragms and preparation methods, lithium ion batteries, battery modules and battery packs. Background technique [0002] Due to its high capacity, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness, lithium-ion batteries have been widely used in various fields such as mobile communications and digital products, and have gradually become the mainstay in the fields of energy storage and electric vehicles. main energy system. [0003] As one of the key materials of lithium batteries, the diaphragm plays a vital role in ensuring the safe operation of the battery. As a material for separating the positive and negative electrodes, the separator is used to prevent the direct contact between the positive and negative electrodes and at the same time to is...

Claims

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Application Information

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IPC IPC(8): C08G83/00C09D187/00C08J7/04H01M50/417H01M50/403H01M10/0525C08L23/06
CPCC08G83/001C09D187/005H01M10/0525C08J2323/06C08J2487/00Y02E60/10
Inventor 陈俊越陈丽杰刘会权
Owner BYD CO LTD
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