Battery separator, battery and preparation method of battery separator

A technology for battery separators and batteries, applied in secondary batteries, battery components, circuits, etc., can solve the problem of low liquid retention in battery separators, achieve improved long-term cycle performance, increase the degree of infiltration, and achieve a good interface Effect

Pending Publication Date: 2020-09-01
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a battery separator, a battery and a method for preparing a battery separator, which solves the problem of low liquid retention in battery separators in the prior art

Method used

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  • Battery separator, battery and preparation method of battery separator
  • Battery separator, battery and preparation method of battery separator
  • Battery separator, battery and preparation method of battery separator

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preparation example Construction

[0065] See Figure 5 , the embodiment of the present invention provides a method for preparing a battery separator. Such as Figure 5 As shown, the method includes the following steps:

[0066] Step 501 , using a metal oxide or a carbonate compound as a hard template, through a hydrolysis reaction of tetraethyl orthosilicate, to obtain hybrid particles with a silicon dioxide layer on the outside and the hard template as the core.

[0067] Specifically, a metal oxide or a carbonate compound can be used as a hard template, ammonia water, a surfactant, and tetraethyl orthosilicate are added to stir the reaction and centrifuged to wash to obtain a silica shell containing the hard template as the core. hybrid particles.

[0068] In this step, in the embodiment of the present invention, based on the hard template method, using the principle that tetraethyl orthosilicate will be hydrolyzed under alkaline conditions to form silica spheres, using metal oxides or carbonates as hard t...

Embodiment 1

[0092] Embodiment 1, embodiment 1 can be made as image 3 Battery separator shown:

[0093] 1) Preparation of the first particle

[0094] Disperse 0.2g of iron ferric oxide nanoparticles (particle size is 150nm) in 140mL of absolute ethanol, add 2mL of ammonia water, 40mL of deionized water and surfactant, add 0.5mL of orthosilicon dropwise within 1 hour under the action of mechanical stirring Ethyl acetate, reacted at room temperature for 12 hours, obtained porous hybrid particles with ferric oxide core and silica shell;

[0095] Disperse the above-mentioned porous hybrid particles in a solvent containing 60mL of ethanol, 20mL of water, 1mL of ammonia water and 1mL of 3-aminopropyltriethoxysilane, mix well, and react at 80°C for 2 hours to obtain amino-modified porous hybrid particles;

[0096] Re-disperse the amino-modified porous hybrid particles in anhydrous chloroform, deoxygenate with nitrogen for 30 minutes, add triethylamine, stir evenly, place at 0°C and slowly add...

Embodiment 2

[0109] Embodiment 2, embodiment 2 can be made as Figure 4 Battery separator shown:

[0110] 1) Preparation of the first particle

[0111] Disperse 0.2g of iron ferric oxide nanoparticles (particle size is 150nm) in 140mL of absolute ethanol, add 2mL of ammonia water, 40mL of deionized water and surfactant, add 0.5mL of orthosilicon dropwise within 1 hour under the action of mechanical stirring Ethyl acetate, reacted at room temperature for 12 hours, obtained porous hybrid particles with ferric oxide core and silica shell;

[0112] Disperse the above-mentioned porous hybrid particles in a solvent containing 60mL of ethanol, 20mL of water, 1mL of ammonia water and 1mL of 3-aminopropyltriethoxysilane, mix well, and react at 80°C for 2 hours to obtain amino-modified porous hybrid particles;

[0113] Re-disperse the amino-modified porous hybrid particles in anhydrous chloroform, deoxygenate with nitrogen for 30 minutes, add triethylamine, stir evenly, place at 0°C and slowly ad...

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Abstract

The invention provides a battery separator, a battery and a preparation method of the battery separator. The battery separator comprises a substrate and a coating, wherein the substrate comprises a first surface and a second surface which are arranged back to back; and the coating is coated on at least one of the first surface and the second surface, the coating comprises first particles, the first particles comprise a silicon dioxide layer, the outer surface of the silicon dioxide layer is covered with a first polymer, and an accommodating chamber is formed in the silicon dioxide layer. The accommodating chamber is formed in first particles contained in the coating of the separator, so that a storage space can be provided for an electrolyte, the electrolyte retention amount of the batteryseparator is increased, and the infiltration degree of the battery separator is further improved. Besides, the first polymer grafted on the silicon dioxide layer can increase the adhesion force of the separator to a pole piece, so that a good interface is maintained, and the long cycle performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a battery separator, a battery and a method for preparing the battery separator. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, no memory effect, and environmental protection. As energy storage devices, they are widely used in consumer electronics and power tools. With the development of science and technology and the improvement of living standards, people have put forward higher and higher requirements for the performance of lithium-ion batteries, especially their fast charge and discharge, long-term cycle and safety performance. [0003] Battery separator is an important component of lithium-ion batteries, and its physical and chemical structures have a significant impact on the battery performance and safety performance of lithium-ion batteries. During the charging and discharging process of lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 苏权飞李素丽徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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