Polypropylene diaphragm compounded with kenyaite-silicon dioxide aerogel for lithium battery

A water sodium wollastite and silicon dioxide technology, which is applied in lithium batteries, non-aqueous electrolyte batteries, battery pack parts, etc., can solve the problems that limit the performance of lithium ion batteries, the porosity of the coating is not high enough, and affect the migration of lithium ions. and other problems, to achieve the effect of favorable for repeated migration, excellent liquid absorption, improved thermal stability and anti-prick ability

Active Publication Date: 2018-08-14
义乌市坤玥玩具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this can effectively improve the thermal stability and other physical properties of the separator, the surface of the separator is covered by a coating, and the porosity of the coating is not high enough, which greatly reduces the liquid absorption rate of the separator, affects the migration of lithium ions, and leads to battery failure. The internal resistance increases, on the other hand, the coating applied in the later period is also easy to fall off in the later period, which limits the performance of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A lithium battery polypropylene diaphragm composited with hydroxonite-silica airgel, which is composed of diaphragm base material polypropylene and reinforcing material hydroxonite-silica airgel micropowder, the The mass proportion of the hydroxonite-silica airgel micropowder is 5%.

[0033] Wherein, the preparation method of the hydroxonite-silica airgel micropowder is as follows:

[0034] A) In parts by weight, 5 parts of hydroxonite and 10 parts of sodium bicarbonate solution with a concentration of 15wt% were uniformly mixed, heated to 65°C for 1.5h, and then the solid was taken out, and irradiated with vacuum microwave at 300°C for 2h , to obtain surface-treated hydroxonite.

[0035] Add the surface-treated hydroxonite to tetraethyl orthosilicate of 3 times the mass, stir evenly, add water with 3.5 times the mass of hydroxonite and absolute ethanol with 5 times the mass of hydroxonite , ultrasonically dispersed to obtain a dispersion, the pH of the dispersion was...

Embodiment 2

[0044] A lithium battery polypropylene diaphragm composited with hydroxonite-silica airgel, which is composed of diaphragm base material polypropylene and reinforcing material hydroxonite-silica airgel micropowder, the The mass proportion of the hydroxonite-silica airgel micropowder is 3%.

[0045] Wherein, the preparation method of the hydroxonite-silica airgel micropowder is as follows:

[0046] A) In parts by weight, 4 parts of hydroxonite and 9 parts of sodium bicarbonate solution with a concentration of 15wt% were uniformly mixed, heated to 65°C for 2h, and then the solid was taken out, and irradiated by vacuum microwave at 280°C for 2.5h , to obtain surface-treated hydroxonite.

[0047] Add the surface-treated hydroxonite to 2.5 times the mass of orthosilicate ethyl, stir evenly, add water with 3 times the mass of hydroxonite and absolute ethanol with 4.5 times the mass of hydroxonite , ultrasonically dispersed to obtain a dispersion, the pH of the dispersion was adjus...

Embodiment 3

[0056] A lithium battery polypropylene diaphragm composited with hydroxonite-silica airgel, which is composed of diaphragm base material polypropylene and reinforcing material hydroxonite-silica airgel micropowder, the The mass proportion of the hydroxonite-silica airgel micropowder is 8%.

[0057] Wherein, the preparation method of the hydroxonite-silica airgel micropowder is as follows:

[0058] A) In parts by weight, 5 parts of hydroxonite and 11 parts of sodium bicarbonate solution with a concentration of 10 wt% were mixed evenly, heated to 60°C for 2h, and then the solid was taken out, and irradiated with vacuum microwave at 320°C for 2.5h , to obtain surface-treated hydroxonite.

[0059] Add the surface-treated hydroxonite to tetraethyl orthosilicate of 3.5 times its mass, stir evenly, add water with 4 times the mass of hydroxonite and absolute ethanol with 5 times the mass of hydroxonite , ultrasonically dispersed to obtain a dispersion, the pH of the dispersion was a...

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Abstract

The invention relates to the field of preparation of lithium battery diaphragms, and discloses a polypropylene diaphragm compounded with kenyaite-silicon dioxide aerogel for a lithium battery. The diaphragm is prepared by compounding a diaphragm base material, namely polypropylene, and a reinforcing material, namely kenyaite-silicon dioxide aerogel micro powder, wherein the mass ratio of the kenyaite-silicon dioxide aerogel micro powder is 1-10%. The polypropylene diaphragm for the lithium battery has excellent liquid absorption performance, thermal stability and anti-puncture resistance without a coating.

Description

technical field [0001] The invention relates to the field of lithium battery diaphragm preparation, in particular to a lithium battery polypropylene diaphragm compounded with hydroxonite-silicon dioxide aerogel. Background technique [0002] In lithium-ion batteries, the function of the separator is to isolate the positive and negative electrode materials to prevent short circuit, and it can absorb the electrolyte to facilitate the migration of lithium ions. Therefore, the separator plays a key role in the performance of Li-ion batteries. [0003] At present, new energy has been greatly developed in the automotive industry. Due to its application in the automotive field, the safety of power lithium-ion batteries is particularly important. However, the high-energy-density lithium-ion battery carries a large current. When the battery is working or overcharged, it will generate a lot of heat, and the battery is prone to thermal runaway, which may cause combustion and explosion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/446H01M50/489
CPCH01M10/052H01M50/403H01M50/431Y02E60/10
Inventor 陈颖婷
Owner 义乌市坤玥玩具有限公司
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