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Organic-inorganic composite microsphere, battery diaphragm, preparation method of organic-inorganic composite microsphere, preparation method of battery diaphragm and battery

A technology of inorganic composite microspheres and battery separators, which is used in secondary batteries, battery pack parts, and secondary battery repair/maintenance, etc. Problems such as poor thickness consistency

Pending Publication Date: 2022-08-09
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A common way to modify the surface of polyolefin separators is to set a modified layer on the surface of the separator. However, the existing surface coating modification methods have limited improvement in the thermal stability of the separator and the wettability of the electrolyte, and some The thickness consistency of the modified modification layer formed by the method is poor

Method used

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  • Organic-inorganic composite microsphere, battery diaphragm, preparation method of organic-inorganic composite microsphere, preparation method of battery diaphragm and battery
  • Organic-inorganic composite microsphere, battery diaphragm, preparation method of organic-inorganic composite microsphere, preparation method of battery diaphragm and battery
  • Organic-inorganic composite microsphere, battery diaphragm, preparation method of organic-inorganic composite microsphere, preparation method of battery diaphragm and battery

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Embodiment 1

[0034] This embodiment prepares a kind of organic-inorganic composite microspheres, and its preparation method is as follows:

[0035] S1, adopt dianhydride monomer pyromellitic dianhydride and diamine monomer bis(4-aminophenyl) ether, and use aprotic polar N,N-dimethylformamide (DMF as solvent, according to single The mass ratio of the body and the solvent is 1:1, and it is placed in an ice-water bath to synthesize a polyamic acid (PAA) solution with a solid content of 12 wt% through a polymerization reaction, and then placed at a constant temperature of 50 °C for aging treatment to obtain molecular weight. Polyamic acid (PAA) solution with uniform distribution and intrinsic viscosity of 0.3dl / g;

[0036] S2, adding tetraethyl orthosilicate (TEOS) with a mass ratio of 10% to the polyamic acid (PAA) solution finally obtained in step S1, and sealing and stirring at room temperature for 6 hours to prepare a clear, transparent mixed uniform PAA / TEOS Mixed solution; then use PAA / ...

Embodiment 2

[0039] This embodiment prepares a kind of organic-inorganic composite microspheres, and its preparation method is as follows:

[0040] S1, according to the same operation as step S1 in Example 1, prepare a polyamic acid (PAA) solution;

[0041] S2, the polyamic acid (PAA) solution finally obtained in step S1 is used as spinning solution for electrospinning, and the spinning parameters are controlled to be positive pressure+50KV, negative pressure-10KV, spray distance 20cm, brushing speed 10cm / s, to prepare the second precursor microspheres;

[0042] S3. Place the second precursor microspheres prepared in step S2 in TiOSO with a concentration of 0.2 mol / L 4 In the solution, the complexation reaction is carried out at room temperature. Specifically, the -COOH on the surface of the second precursor microspheres will interact with TiO. 2+ Adsorption complexation reaction occurs; then it is placed in deionized water of the hydrolyzate, and the TiO 2+ Hydrolysis occurs to genera...

Embodiment 3

[0046] This embodiment prepares a battery separator, and the preparation method includes:

[0047] S1, take 9 parts of organic-inorganic composite microspheres prepared in Example 1, 1 part of sodium carboxymethyl cellulose (CMC), and 1 part of polyvinylpyrrolidone (PVP), and mix with water and ethanol in a volume ratio of 1:1 98 parts of the solvent were placed in a homogenizer and homogenized at a speed of 8000 rpm for 1 hour, and after mixing evenly, filtered through a 300-mesh screen to obtain a modified slurry;

[0048] S2. Using a flat blade coater, scrape the modified slurry prepared in step S1 on a polyethylene microporous base film with a coating gap of 100 μm. The polyethylene microporous base film is commercially available and has a thickness of 3 to 200 nm. , the porosity is 20%-80%, and the air permeability is 50-200s / 100cc; after the coating is completed, it is placed on an ultra-clean table to dry naturally, and then vacuum-dried at 60 °C for 12 hours to obtain ...

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Abstract

The invention discloses an organic-inorganic composite microsphere, a battery diaphragm, a preparation method of the battery diaphragm and a battery, and the preparation method of the organic-inorganic composite microsphere comprises the following steps: mixing polyamide acid and a silicon source to prepare a first precursor microsphere, placing the first precursor microsphere in a first hydrolysate for hydrolysis, and then carrying out thermal imidization and dehydration treatment; or preparing second precursor microspheres by adopting a polyamide acid solution, then mixing the second precursor microspheres with TiOSO4 to carry out complexation reaction, then placing the second precursor microspheres in a second hydrolysate to hydrolyze, and finally carrying out thermal imidization and dehydration treatment. The organic-inorganic composite microsphere prepared by the method is uniform in core-shell structure and size, has excellent thermal stability and wettability, and can be applied to surface modification of a polyolefin diaphragm, so that the thermal stability and electrolyte wettability of the diaphragm are enhanced, and the service life of the diaphragm is prolonged. And the thickness of the modified layer formed on the surface of the polyolefin diaphragm and the consistency of the overall performance of the diaphragm can be ensured, so that the safety and the cycle performance of the battery can be improved when the diaphragm is applied to the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery separators, in particular to an organic-inorganic composite microsphere, a battery separator, a preparation method thereof, and a battery. Background technique [0002] As an efficient storage and conversion chemical energy device, lithium-ion batteries are widely used in portable electronic devices due to their high energy density, good rate performance, and environmental protection. It is composed of electrolyte, aluminum-plastic film, etc. As one of the important components of the battery, the diaphragm can prevent the short circuit of the positive and negative electrodes due to direct contact, and can also provide a channel for the transmission of ions. [0003] Most of the current commercial lithium-ion battery separators use polyolefin materials, such as polyethylene and polypropylene. Due to the stable chemical properties, high mechanical strength, good thermal closure performa...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08L79/08C08K3/36C08J9/36H01M10/0525H01M10/42H01M50/403H01M50/417H01M50/446H01M50/449H01M50/489
CPCC08J3/12C08J9/365H01M50/403H01M50/417H01M50/446H01M50/449H01M50/489H01M10/0525H01M10/4235C08J2323/06C08J2479/08C08K3/36Y02E60/10
Inventor 肖政邓豪陈杰
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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