High-thermal-stability battery diaphragm as well as preparation method and application thereof

A technology of high thermal stability and battery diaphragm, which is applied in the direction of batteries, fuel cells, lithium batteries, etc., can solve the problems of poor thermal stability and heat dissipation of battery diaphragms, achieve simple and easy preparation methods, increase transmission speed, and reduce porosity The effect of rate reduction

Pending Publication Date: 2021-10-22
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of poor thermal stability and poor heat dissipation of the battery separator in the prior art, the present invention proposes a high thermal stability battery separator and its preparation method and application. For the first time, two-dimensional siloxene is used on the battery separator, not only Expanding the application of two-dimensional siloxene, while improving the thermal stability of the battery separator, the separator also has good thermal conductivity, avoiding excessive local temperature, causing safety hazards, and at the same time, under the premise of ensuring thermal stability, not Affect the ability of the diaphragm to transport ions, so that the composite film has thermal stability, porosity, and electrochemical performance

Method used

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  • High-thermal-stability battery diaphragm as well as preparation method and application thereof
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  • High-thermal-stability battery diaphragm as well as preparation method and application thereof

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preparation example Construction

[0034] In a second aspect, the present invention provides a method for preparing a high thermal stability battery separator, comprising the following steps:

[0035] The siloxene is formulated into a slurry with a mass concentration of 2-30%, and then coated on the diaphragm and dried.

[0036] If the mass concentration of siloxene is too high, it is easy to disperse unevenly and agglomerate, which affects the uniformity of its coating on the diaphragm, which not only reduces the stability of the combination of the siloxene coating layer and the diaphragm, but also reduces the thermal stability of the diaphragm , After the separator and other components are assembled into a battery, the cycle performance of the battery will be reduced. If the mass concentration of siloxene is too low, siloxene cannot form a continuous and complete coating layer on the surface of the diaphragm, which will make the siloxene coating layer fall off easily, and the stable physical and chemical inte...

Embodiment 1

[0057] A method for preparing a battery separator with high thermal stability:

[0058] Take 1.0g of commercial calcium silicide, then in 50mL 5mol L -1 The hydrochloric acid solution was stirred at room temperature (30° C.) for 10 h, and then the obtained solution was washed with deionized water three times, and vacuum-dried at 80° C. for 20 h to obtain siloxene;

[0059] Take 0.5g of siloxane, add 0.04g of polyvinylidene fluoride in nitrogen methyl pyrrolidone solution, the mass fraction of polyvinylidene fluoride is 6%, stir evenly, and then spray it on the polyethylene diaphragm, after drying A two-dimensional siloxene separator (siloxene-polyethylene film) with a thickness of 30 μm can be obtained.

Embodiment 2

[0061] A method for preparing a battery separator with high thermal stability:

[0062] Take 1.0g of commercial calcium silicide, then use 2mol L -1 The hydrochloric acid solution was treated for 18 hours, and then the obtained solution was washed with deionized water for 3 times, and after vacuum drying at 80°C for 20 hours, siloxene was obtained;

[0063] Take 0.3g of siloxane, add 0.04g of polytetrafluoroethylene in N,N-dimethylformamide solution, the mass fraction of polyvinylidene fluoride is 7%, stir evenly, and then coat it on the diaphragm in a sliding manner. After drying, a two-dimensional siloxane membrane with a thickness of 25 μm can be obtained.

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Abstract

The invention relates to the technical field of batteries, in particular to a high-thermal-stability battery diaphragm as well as a preparation method and application thereof. The high-thermal-stability battery diaphragm comprises a diaphragm, and the diaphragm is provided with a silylene coating layer. The prepared diaphragm is high in thermal stability and good in safety, and the problem that the diaphragm is poor in thermal stability is solved. And heat preservation is carried out at 120 DEG C, the commercialized diaphragm is deformed and shrunk at high temperature, and the diaphragm with the modified thickness is still kept complete. According to the two-dimensional silylene nanosheet, the diaphragm is coated with a two-dimensional sheet structure, so that heat conduction is facilitated. Besides, the nanosheet structure can also alleviate the problem of increase of ion impedance caused by reduction of the porosity, because the nanosheet structure can provide an ion transmission channel, the ion transmission speed is greatly improved, and the influence of the coating on the porosity of the diaphragm is effectively solved. The preparation method of the diaphragm is simple and easy to implement, low in cost and hopeful for large-scale production.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery separator with high thermal stability and a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Batteries have attracted much attention as a promising energy storage device. But the safety problem of the battery does limit its further development. As one of the important components of the battery, the separator is mainly used to separate the positive and negative electrodes in the battery, preventing direct contact between the positive and negative electrodes and short circuit, which plays a vital role in the safety of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/417H01M50/431H01M50/446H01M50/449H01M10/052H01M8/0228B82Y30/00B82Y40/00
CPCH01M50/417H01M50/431H01M50/403H01M50/446H01M50/449H01M10/052H01M8/0228B82Y30/00B82Y40/00H01M2220/20H01M2250/30Y02E60/10Y02E60/50
Inventor 冯金奎安永灵田园
Owner SHANDONG UNIV
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