Preparation method of ceramic-modified lithium-ion battery diaphragm

A technology for lithium ion batteries and separators, which is applied in the field of preparation of ceramic modified lithium ion battery separators, can solve the problems of short storage time, time-consuming, unstable dispersion, etc., avoid high temperature treatment, avoid uneven dispersion and stable effect

Active Publication Date: 2014-10-08
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] No matter what kind of surfactant is used, it means that the dispersion step is difficult and time-consuming, an

Method used

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  • Preparation method of ceramic-modified lithium-ion battery diaphragm
  • Preparation method of ceramic-modified lithium-ion battery diaphragm
  • Preparation method of ceramic-modified lithium-ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like figure 1 As shown, using CMC as a binder and water as a solvent, the solution is heated to 80°C, and then coated on a PE separator with a thickness of 10 μm (the PE separator is pre-treated with polydopamine) by dipping-pulling method. Obtain viscous slurry-coated diaphragm 1; at the same time, use the silane coupling agent KH560 to treat the silica ceramics with a D90 of 400nm, the dosage is 3% (mass fraction) of the silica ceramics, and use a Henschel high-speed mixer, After mixing at high speed for 1 hour, vacuum bake at 180° C. for 2 hours to obtain ceramic 4 treated with active material. The temperature of the fluidized bed chamber 3 is kept at 80°C by the heating wire 5, and the diaphragm is pulled forward by the roller 2 and the roller 3. Due to the viscosity of 1, ceramic particles will accumulate on its surface, and the excess particles are removed by a brush. After hot pressing by roller 6 and drying, a ceramic modified diaphragm is obtained.

Embodiment 2

[0033] like figure 2 As shown, after heating the vinylidene fluoride-hexafluoropropylene copolymer / N,N-dimethylformamide solution to 80°C, place it in the cylinder 10, and after the diaphragm 9 passes through the cylinder, it hangs on its surface After a layer of wet film passes through the guide roller 11, the spray gun array 16 applies the atomized ceramic particles 15 on the surface of the wet film, and after being hot-pressed by the roller machine 14, it is dried to obtain a ceramic modified diaphragm. Here, the substrate diaphragm used is the surface of the PE diaphragm with a thickness of 16 μm, the silane coupling agent is KH540, the ceramic is alumina, the particle size D90 is 900nm, and the amount of KH540 is 2% (mass fraction) of the alumina ceramic. The method is to use a Henschel high-speed mixer, mix at high speed for 2 hours, and then vacuum bake at 180° C. for 2 hours to obtain active material-treated ceramics. The modified diaphragm obtained here has PVDF-HFP...

Embodiment 3

[0035]Using polyvinyl alcohol as a binder and water as a solvent, heat the solution to 80°C and apply it on one side of a PE separator with a thickness of 16 μm (pre-treated with polydopamine) to obtain a viscous slurry-coated separator At the same time, use silane coupling agent KH550 to treat zirconia ceramics with D90 of 500nm, the dosage is 2% (mass fraction) of zirconia ceramics, use Henschel high-speed mixer, after high-speed mixing for 4 hours (the density of zirconia ceramics is higher, The mixing time is longer), and vacuum baked at 180°C for 2 hours to obtain active material-treated ceramics. Then use a spray gun to atomize and spray the obtained modified ceramic particles on the surface of the wet diaphragm with compressed air to control the coating thickness to 5 μm, then hot press with a pair of rollers, and then dry to obtain a ceramic modified diaphragm.

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Abstract

The invention relates to a preparation method of a ceramic-modified lithium-ion battery diaphragm. The preparation method is characterized by particularly comprising the following steps: (A) coating a polymer porous diaphragm with slurry; (B) treating ceramic particles by adopting an active material; (C) uniformly distributing ceramic obtained in the step (B) on the porous polymer diaphragm coated with the slurry in the step (A); and (D) carrying out hot pressing on the diaphragm obtained in the step (C) to obtain a product. The preparation method disclosed by the invention fundamentally solves the problem that ceramic components are non-uniformly dispersed in the preparation process of liquid ceramic slurry, by using the method, a surface active agent is prevented from being adopted for promoting the uniform dispersion of the ceramics, the cost is saved, the dimensional stability and the mechanical property of the diaphragm can be greatly enhanced, and the method can be applied to a lithium-ion battery, a fuel cell, a lead-acid battery, a supercapacitor and the like.

Description

technical field [0001] The invention relates to a preparation method of a ceramic modified lithium-ion battery diaphragm, in particular to a preparation method of a diaphragm that can be used for a power battery. Background technique [0002] Studies have shown that the battery separator plays a key role in the safety of the power battery. On the one hand, the separator plays the role of electronic insulation to avoid internal short circuits in the battery; on the other hand, the separator provides a channel for ion transfer to ensure the smooth progress of the electrochemical reaction. . [0003] At present, most lithium-ion battery separators are organic polymer separators. The most significant disadvantage of this type of separator is that when heated, large thermal deformation will occur, so that an internal short circuit will occur due to the contact between the positive and negative electrodes, which will lead to heat loss. The possibility of loss of control or explos...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/409H01M50/434
CPCH01M10/0525H01M50/446H01M50/403Y02E60/10
Inventor 王丹赵中令于力娜张克金张斌崔龙曹婷婷魏传盟
Owner CHINA FIRST AUTOMOBILE
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