A kind of non-woven ceramic diaphragm for lithium ion battery and preparation method thereof

A lithium-ion battery, ceramic separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of poor coating uniformity, poor dispersion, etc. The effect of polarity and hydrophilicity

Inactive Publication Date: 2017-09-29
XUCHENG FUJIAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method effectively improves the high temperature resistance of the separator, but the dispersion of the nano-silica microspheres added in the middle of the reaction in the sol is poor, which makes the uniformity of the coating worse.

Method used

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  • A kind of non-woven ceramic diaphragm for lithium ion battery and preparation method thereof
  • A kind of non-woven ceramic diaphragm for lithium ion battery and preparation method thereof
  • A kind of non-woven ceramic diaphragm for lithium ion battery and preparation method thereof

Examples

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preparation example Construction

[0034] A preparation method of a non-woven ceramic diaphragm for a lithium-ion battery, comprising the following steps:

[0035] (1) Pretreatment of non-woven fabrics: Utilize catechol derivative solution to modify non-woven fabrics, introduce active groups on the surface of non-woven fabrics and fiber pores, and obtain modified non-woven fabrics;

[0036] (2) Preparation of sol coating solution by alkali / acid sol-gel method: add orthosilicate ethyl ester, water, alcohol and ammonia water in turn to reaction bottle A, stir and react at room temperature for 4-12 hours, and the stirring speed is 1200-1400rpm, Form alkali sol A; add orthosilicate ethyl ester, water, alcohol and acid to reaction bottle B in sequence, stir at room temperature for 30 minutes, stirring speed is 1200-1400rpm, form acid sol B; finally add acid sol B to alkali sol A and place the reaction bottle in an oil bath at 30-90°C for 1-6 hours to prepare a sol coating solution containing nano-silica microspheres...

Embodiment 3

[0049] A preparation method of a non-woven ceramic diaphragm for a lithium-ion battery, comprising the following steps:

[0050] (1) Pretreatment of non-woven fabrics: soak PP non-woven fabrics with a thickness of 35 μm and a porosity of 65% in 1.5 g / L methacryl dopamine solution for 48 hours, and wash off the surface-adhered particles with distilled water. Methacryloyl dopamine was dried naturally to obtain a modified non-woven fabric;

[0051] (2) Preparation of sol coating solution by alkali / acid sol-gel method: add orthosilicate ethyl ester, water, ethanol and ammonia water to reaction bottle A in sequence, stir and react for 4 hours at room temperature, and the stirring speed is 1200rpm to form alkali sol A; in addition, add ethyl orthosilicate, water, ethanol and hydrochloric acid successively in reaction flask B, stir at room temperature for 30min, stirring speed is 1200rpm, form acid sol B; finally join acid sol B in alkali sol A and The reaction bottle was placed in ...

Embodiment 4

[0056] A preparation method of a non-woven ceramic diaphragm for a lithium-ion battery, comprising the following steps:

[0057] (1) Pretreatment of non-woven fabrics: soak PE non-woven fabrics with a thickness of 38 μm and a porosity of 62% in a 3g / L dopa solution for 48 hours, wash off the dopa attached to the surface with distilled water, and naturally Dry to obtain the modified non-woven fabric;

[0058] (2) Preparation of sol coating solution by alkali / acid sol-gel method: add orthosilicate ethyl ester, water, isopropanol and ammonia water in turn in reaction bottle A, stir and react at room temperature for 12 hours, and the stirring speed is 1300rpm to form alkali Sol A; In addition, add ethyl orthosilicate, water, isopropanol and nitric acid to the reaction bottle B in sequence, stir at room temperature for 30 minutes, and the stirring speed is 1300rpm to form acid sol B; finally add acid sol B to alkali sol A The reaction bottle was placed in an oil bath at 90° C. for...

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Abstract

The invention relates to the field of diaphragm materials, in particular to a non-woven ceramic diaphragm for lithium-ion batteries, which introduces active groups into the surface of the non-woven fabric and fiber pores to obtain a modified non-woven fabric, and then uses acid / alkali two The sol coating solution containing nano-silica microspheres is prepared by the sol-gel method, and the sol coating solution is coated on the modified non-woven fabric, and then subjected to hot rolling treatment to obtain a non-woven ceramic diaphragm; The preparation method of the invented non-woven ceramic diaphragm includes the steps of non-woven fabric pretreatment, preparation of sol coating solution by alkali / acid sol-gel method, uniform coating of sol coating solution on both sides of modified non-woven fabric, etc. The non-woven ceramic diaphragm of the present invention has a moderate thickness, does not increase too much resistance and affects battery performance, has good lyophilicity, air permeability, high temperature resistance, thermal stability and safety, and is extremely firm in adhesion. The process will not fall off, and the ion conductivity is improved; the preparation method of the invention is simple, does not require high equipment, and can be operated continuously.

Description

technical field [0001] The invention relates to the field of diaphragm materials, in particular to a non-woven ceramic diaphragm for lithium ion batteries and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have gradually replaced traditional lead-acid batteries and nickel-cadmium batteries due to their advantages such as high power density, low self-discharge rate, and no memory effect. Lithium-ion batteries are currently widely used in portable electronic products such as rechargeable batteries required for mobile phones, notebook computers, cameras, etc., and have gradually expanded to power tools, large power supplies, and other fields. [0003] Currently, lithium-ion battery separators on the market are mainly polyolefin separators, such as single-layer polypropylene (PP) microporous membranes, single-layer polyethylene (PE) microporous membranes, and three-layer PP / PE / PP composite membranes. However, it is difficult f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/411H01M50/434H01M50/44H01M50/443H01M50/489H01M50/491H01M50/497
CPCH01M10/0525H01M50/403H01M50/449H01M50/411H01M50/44Y02E60/10
Inventor 李文谨陈洪隆胡洪海刘峥赵静
Owner XUCHENG FUJIAN SCI & TECH
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