Silicon nitride composite separator and preparation method thereof

A technology of composite diaphragm and silicon nitride, applied in the field of electrochemistry, can solve the problems of complex process, uniformity change of diaphragm, high temperature resistance, etc., and achieve the effects of low cost of raw materials, simple preparation process and good heat resistance.

Active Publication Date: 2014-07-16
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Referring to the patent document CN101542777A, it can be seen that LG’s patented technology adheres the electrodeless powder to the separator through an adhesive. Although it has a certain effect, it is limited by the melting point of the adhesive and cannot withstand high temperatures. At the same time, its The process is relatively complicated; referring to the patent document CN1883063A, it can be seen that Degusa’s patented technology directly presses the powder onto the diaphragm through hot pressing. Although it can withstand a high temperature, it is easy to drop the powder and cause the consistency of the diaphragm. Variety
All in all, the separators in the prior art have the disadvantage that they are not resistant to high temperature due to the limitation of the melting point of the adhesive, or they are resistant to high temperature but the hot-pressed powder is easy to fall off.

Method used

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  • Silicon nitride composite separator and preparation method thereof
  • Silicon nitride composite separator and preparation method thereof

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preparation example Construction

[0019] The preparation method of the silicon nitride composite diaphragm of the present invention comprises the following steps:

[0020] (a) Pretreatment of the diaphragm, ultrasonic cleaning of the diaphragm;

[0021] (b) Immersion of the pretreated separator in liquid SiH at low temperature 4 , then the liquid SiH 4 The soaked septum was taken out and placed in liquid NH 3 in the immersion reaction;

[0022] (c) The reacted separator is taken out and dried to obtain a silicon nitride composite separator.

[0023] In the above-mentioned embodiment, the diaphragm can be specifically a polypropylene diaphragm (referred to as PP diaphragm), a polyethylene diaphragm (referred to as PE diaphragm), and sequentially stacked polypropylene, polyethylene, and polypropylene composite diaphragms (referred to as PP / PE / PP diaphragms). ), or polyethylene terephthalate non-woven diaphragm (referred to as PET non-woven diaphragm).

[0024] Step (a) of the above embodiment is specificall...

Embodiment 1

[0030] First soak the polyethylene terephthalate non-woven diaphragm (PET diaphragm for short) in ethanol solution for 10 minutes, then soak the diaphragm in acetone and ultrasonic for 10 minutes, and finally put it into a 60℃ vacuum drying box to dry to constant weight;

[0031] Then, in a reaction chamber with a temperature of -40°C, the above-mentioned treated membranes were immersed in liquid SiH 4 30 minutes in. Next, from liquid SiH 4 Take out the soaked diaphragm, and a large amount of liquid SiH is attached to the diaphragm at this time. 4 , the diaphragm is placed in liquid NH 3 Soak in 60 minutes to make the liquid SiH attached to the surface of the diaphragm 4 with liquid NH 3 A reaction occurs to generate silicon nitride on the surface of the diaphragm;

[0032] Finally, the separator after the soaking reaction was put into a vacuum drying oven at 80° C. and dried to a constant weight to obtain a silicon oxide composite separator with silicon oxide deposited ...

Embodiment 2

[0035] First soak the polyethylene diaphragm (PE diaphragm for short) in ethanol solution for 20 minutes, then soak the diaphragm in acetone and ultrasonic for 20 minutes, and finally put it in a 70°C vacuum drying oven to dry to constant weight;

[0036] Then, in a reaction chamber with a temperature of -50°C, the above-mentioned treated membranes were immersed in liquid SiH 4 10 minutes in. Next, from liquid SiH 4 Take out the soaked diaphragm, and a large amount of liquid SiH is attached to the diaphragm at this time. 4 , the diaphragm is placed in liquid NH 3 Soak for 10 minutes to make the liquid SiH adhere to the surface of the separator 4 with liquid NH 3 A reaction occurs to generate silicon nitride on the surface of the separator.

[0037] Finally, the membrane after the soaking reaction was put into a vacuum drying oven at 100° C. and dried to a constant weight to obtain a silicon oxide composite membrane with silicon oxide deposited on the surface.

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Abstract

The invention relates to a silicon nitride composite separator and a preparation method thereof. The preparation method comprises the following steps: at a temperature of -50 DEG C to -30 DEG C, immersing the separator with liquid monosilane for 5-30 min, then immersing the separator with liquid ammonia for 10-120 min, so as to depositing silicon nitride on the separator surface, and finally performing vacuum drying to obtain the silicon nitride composite separator. By employing the one-step synthetic technology, silicon nitride is effectively uniformly distributed on the separator surface. Because no adhesives are used and a high-temperature sintering process is not used, the silicon nitride composite separator has good heat resistance and is not easy to dust, and thus the safety of a battery is improved. Additionally, the whole preparation process is simple, the raw material cost is low and batch production is easy to realize.

Description

technical field [0001] The patent of the present invention relates to a composite diaphragm in the field of electrochemistry, in particular to a silicon nitride composite diaphragm and a preparation method thereof. Background technique [0002] The main function of the separator in the battery material is to isolate the positive and negative electrodes to prevent the battery from self-discharge and short circuit between the two electrodes. The main material of the diaphragm is a porous polymer film, generally a polyethylene (PE) diaphragm or a polypropylene (Polypropylene, PP) diaphragm, so it is also called a polyethylene film or a PE film. The safety, permeability, porosity and membrane thickness of the separator affect each other's ionic conductivity and mechanical strength. In fact, with the advancement of non-woven technology, polyethylene terephthalate (PET) has no Textiles are also widely used because of their flexibility, light weight, easy decomposition, non-toxic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/414H01M50/431H01M50/44H01M50/491
CPCH01M50/446H01M50/403Y02E60/10
Inventor 周明杰袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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