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Preparation method of ceramic diaphragm with polydopamine as adhesive

A polydopamine and binder technology, which is applied in the direction of separators/films/diaphragms/spacers, structural parts, electrical components, etc., can solve the problem that the heat shrinkage performance is not improved, and achieve excellent cycle performance and heat resistance. The effect of obvious impact performance and thermal shock resistance improvement

Inactive Publication Date: 2014-02-05
CHINA FIRST AUTOMOBILE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the previous [patent, application number: 2012206994229 and 201210549164.0], our research group disclosed a lithium-ion battery separator modified by polydopamine. This patent only uses polydopamine as a modified layer to improve the liquid absorption of the lithium-ion battery separator. / Liquid retention capacity and rate performance of lithium-ion batteries. According to literature (RSC Advances, 2012, 2, 5127–5129), dopamine coating can significantly improve the oxidation and aging resistance of the separator, but experiments show that the separator’s resistance The thermal performance, especially the thermal shrinkage performance, has not been improved. Therefore, we have prepared a polydopamine-ceramic composite modified battery separator. The heat resistance and oxidation resistance of the ion battery separator improve the safety performance of the lithium ion battery; in addition, the separator can also be used in supercapacitors, fuel cells and other fields to improve the performance of the battery

Method used

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  • Preparation method of ceramic diaphragm with polydopamine as adhesive
  • Preparation method of ceramic diaphragm with polydopamine as adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The polymer porous membrane matrix is ​​a dry stretched PP microporous membrane with a thickness of 50 μm; the solid content of silica sol is 50%, the pH is 8.0, and the concentration of dopamine is 0.1g / L. The sample diaphragm is 10m 2 Immerse in 20kg of mixed sol system, let it stand, take it out after 4 hours, wash it with deionized water, soak it with ethanol, and dry it to prepare a modified diaphragm with polydopamine as a binder. From figure 1 It can be seen from the photoelectron spectrum of the modified diaphragm that in addition to C elements, there are Si elements and O elements on the surface of the modified diaphragm, which shows that the experiment has achieved the expected effect.

Embodiment 2

[0017] The polymer porous membrane substrate is a PE microporous membrane prepared by a wet method, with a thickness of 8 μm; the solid content of silica sol is 1%, the pH is 10.0, and the concentration of dopamine is 10g / L. The sample diaphragm is 1m 2 Spread it on a horizontal surface, pour 1kg of mixed silica sol on the surface of the diaphragm, maintain the humidity of 70% in the environment, and then take it off after 36 hours, rinse it with deionized water, soak it in ethanol, and dry it to prepare a polydopamine-bonded agent modified diaphragm. From figure 2 It can be seen from the thermal shrinkage diagram of the modified diaphragm that the thermal shrinkage of the modified diaphragm is significantly reduced. After the unmodified diaphragm is treated at 135 °C for 1 hour, the thermal shrinkage reaches 5%, while the size of the modified diaphragm has basically no change.

Embodiment 3

[0019] The polymer porous membrane matrix is ​​PI microporous membrane with a thickness of 25 μm; the solid content of silica sol is 30%, the pH is 8.50, and the concentration of dopamine is 2g / L. The sample diaphragm is 1m 2 Spread it on a horizontal surface, pour 2kg of mixed silica sol on the surface of the diaphragm, maintain the humidity of 70% in the environment, then take it off after 16 hours, rinse it with deionized water, soak it in ethanol, and dry it to prepare a polydopamine-bonded agent modified diaphragm. The modified separator and PP / PE / PP were assembled into a button battery, and the discharge specific capacity of the modified separator battery was 1.5 times that of the unmodified one at a cycle rate of 4C.

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Abstract

The invention relates to a preparation method of a ceramic diaphragm with polydopamine as an adhesive. The preparation method is characterized by comprising the following steps: (1) soaking a high-molecular polymer porous diaphragm base microporous diaphragm into a mixed silica sol system containing dopamine or coating / casting mixed silica sol on the surface of the high-molecular polymer porous diaphragm base microporous diaphragm, treating for 4-36 hours, and standing, wherein the treatment temperature is room temperature, the solid content of the silica sol is 5-50 percent, the pH (potential of Hydrogen) is 8.0-10.0, and the concentration of the dopamine is 1-10 g / L; and (2) washing with de-ionized water, rinsing with ethanol and then drying. The liquid absorption / retention capacity of the composite diaphragm is prominent, the heat resistance performance is obviously improved, a lithium ion battery has the advantages of superior cycle performance, high ion conduction, high safety and the like after being assembled, and the method provided by the invention is easy and convenient to operate, energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method of a ceramic diaphragm using polydopamine as a binder, in particular to a novel diaphragm that can be used for a power battery. The separator uses the polydopamine layer as a binder to prepare a dopamine-ceramic composite modified battery separator. Background technique [0002] Battery separator is the key material of batteries including lithium batteries, and the core technology of power batteries with high performance requirements. Generally, the battery separator combined with the electrolyte plays the role of ion conduction and electronic insulation. For this reason, the battery separator is mostly porous material, and the material is mostly non-polar polymer materials such as polyethylene and polypropylene. The electrolyte is mostly a metal ion solution with strong polarity, such as lithium-ion battery electrolyte LiPF 6 / DMC / EC system, KOH / H of supercapacitor and zinc-air battery (a type of fuel ce...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/434H01M50/446H01M50/491
CPCH01M10/0525H01M50/409H01M50/403Y02E60/10
Inventor 王丹赵中令于力娜张克金许德超张斌陈雷潘艳春
Owner CHINA FIRST AUTOMOBILE
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