Silicon nitride composite diaphragm and preparation method thereof

A technology of composite diaphragm and silicon nitride, which is applied in the field of electrochemistry, can solve problems such as complex process, low temperature resistance, and change of diaphragm consistency, and achieve the effects of low raw material cost, good heat resistance, and simple preparation process

Active Publication Date: 2016-02-17
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 diaphragm and preparation method thereof
  • Silicon nitride composite diaphragm and preparation method thereof

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preparation example Construction

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

[0020] (a) Pretreating the diaphragm and ultrasonically cleaning the diaphragm;

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

[0022] (c) taking out the reacted diaphragm and drying to obtain a silicon nitride composite diaphragm.

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

[0024] The step (a) of the above embodiment specifically includes soaking the diaphragm ...

Embodiment 1

[0030] Soak the polyethylene terephthalate non-woven diaphragm (abbreviated as PET diaphragm) in ethanol solution for 10 minutes, then soak the diaphragm in acetone for 10 minutes, and finally put it in a vacuum drying oven at 60°C for drying to constant weight;

[0031] Then, in a reaction chamber at -140 °C, soak the above-treated separator in liquid SiH 4 30 minutes. 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 , place the diaphragm in liquid NH 3 Soaked in the middle for 60 minutes, so that the liquid SiH attached to the surface of the diaphragm 4 with liquid NH 3 A reaction occurs to form silicon nitride on the surface of the diaphragm;

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

[0033] figure 1It is the ...

Embodiment 2

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

[0036] Then, in a reaction chamber at -150 °C, the above treated separator was soaked in liquid SiH 4 10 minutes. 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 , place the diaphragm in liquid NH 3 Soak in the middle for 10 minutes, so that the liquid SiH attached to the surface of the diaphragm 4 with liquid NH 3 A reaction occurs to form silicon nitride on the surface of the diaphragm.

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

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Abstract

The invention relates to a silicon nitride composite diaphragm and a preparation method thereof. The preparation method comprises the following steps: soaking the diaphragm with liquid silane for 5 to 30 minutes at a temperature of -150°C to -130°C, and then using liquid The diaphragm is soaked in ammonia for 10-120 minutes to deposit silicon nitride on the surface of the diaphragm, and finally vacuum-dried to obtain the silicon nitride composite diaphragm. The invention effectively and evenly distributes the silicon nitride on the surface of the diaphragm through a one-step synthesis technique. Because there is no adhesive and high-temperature sintering method, the silicon nitride composite diaphragm of the invention has good heat resistance and is not easy to drop powder, thereby improving the safety of the battery. In addition, the whole preparation process of the present invention is simple, the cost of raw materials is low, and it is easy to realize mass production.

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 battery materials is to isolate the positive and negative electrodes to prevent battery self-discharge and short-circuit of the two poles. The main material of the diaphragm is a porous polymer film, generally polyethylene (polyethylene, PE) diaphragm or polypropylene (polypropylene, PP) diaphragm, so it is also called polyethylene film or PE film. The safety, permeability, porosity and film thickness of the diaphragm affect the ion conductivity and mechanical strength of each other. In fact, with the advancement of non-woven fabric technology, the non-woven fabric of polyethylene terephthalate (PET) Cloth is also widely used because of its flexibility, light weight, easy decomposition, non-toxic...

Claims

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Application Information

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Patent Type & Authority Patents(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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