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Ceramic composite separator and preparation method thereof

A ceramic composite and diaphragm technology, applied in the field of electrochemistry, can solve the problems of affecting the long-term stability of the diaphragm, low lithium ion conductivity, and the ceramic layer is easy to fall off, so as to improve the ion conductivity, improve the stability and service life, high The effect of heat resistance

Inactive Publication Date: 2015-04-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ceramic layer in this type of separator is easy to fall off, which affects the long-term stability of the separator, and the conductivity of lithium ions in the ceramic layer is low, which is not conducive to the capacity of lithium-ion batteries under high-rate charge-discharge conditions.

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  • Ceramic composite separator and preparation method thereof

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[0030] The present invention also provides a preparation method for the above-mentioned ceramic composite diaphragm, comprising the following steps:

[0031] The polymer film is treated with plasma to obtain a polymer film with a certain concave-convex structure on the surface;

[0032] Dispersing the ceramic material and the binder in a solvent to obtain a ceramic coating liquid, the ceramic material including a fast ion conductor;

[0033] The ceramic coating solution is covered on the surface of the polymer film, and the solvent is removed to obtain a ceramic composite diaphragm.

[0034] In the present invention, the polymer film is treated with plasma, and the plasma treatment is carried out in an air atmosphere, the treatment intensity is 20-500W, preferably 20-40W, more preferably 25-35W, and the treatment temperature is 60-80°C After treatment for 10-120s under the condition of 15-40°C for 10-120s. After the above plasma treatment, a polymer film with a certain conca...

Embodiment 1

[0050] The commercially available polypropylene diaphragm of Celgard Company in the United States was treated with plasma, and the treatment was carried out in an air atmosphere with a treatment intensity of 20W. First, it was treated at 60°C for 10s, and then at 15°C for 10s to obtain a surface with a certain concave-convex structure. . The zinc germanate lithium type lithium fast ion conductor Li with a mass ratio of 1:0.05 4 Zn(GeO 4 ) 4 and polyvinylidene fluoride are dispersed in acetone to prepare a uniform ceramic coating liquid, wherein the solid content of the coating liquid is 15%. Cover the surface of the polymer film with a concave-convex structure with a ceramic coating solution, and obtain the ceramic composite diaphragm after removing the solvent. The thickness of the ceramic composite diaphragm is 25 μm, wherein the thickness of the ceramic layer is 5 μm, and the polymer layer is The thickness is 20 μm.

[0051] The ceramic composite diaphragms obtained abo...

Embodiment 2

[0057] The commercially available celgard polypropylene diaphragm was treated with plasma, and the treatment was carried out in an air atmosphere with a treatment intensity of 25W. It was first treated at 70°C for 70s, and then at 25°C for 70s to obtain a surface with a certain concave-convex structure. The NASICON type lithium fast ion conductor LiTi with a mass ratio of 1:0.25 2 (PO 4 ) 3 and polymethyl methacrylate are dispersed in dimethylformamide to prepare a uniform ceramic coating liquid, wherein the solid content of the coating liquid is 25%. Cover the surface of the polymer film with a concave-convex structure with a ceramic coating solution, and obtain the ceramic composite diaphragm after removing the solvent. The thickness of the ceramic composite diaphragm is 30 μm, wherein the thickness of the ceramic layer is 11 μm, and the polymer The thickness of the layer was 19 μm.

[0058] The ceramic composite diaphragms obtained above were measured according to the me...

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Abstract

The invention provides a ceramic composite separator which comprises a polymer layer and a ceramic layer compounded on the polymer layer, wherein the joint surface of the ceramic layer and the polymer layer is a rough surface with a concave-convex structure; and the ceramic layer comprises a fast ion conductor. The separator comprises the ceramic layer and the polymer layer, and the rough surface with the concave-convex structure is formed between the ceramic layer and the polymer layer, so that the binding force between the ceramic layer and a polyolefin membrane layer can be improved, the stability of the separator can be further improved, and service life of the separator can be further prolonged. The ceramic layer of the separator comprises a fast ion conductor material, so that the ionic conduction capacity of the separator can be effectively improved, and the capacity of a battery under the high-rate condition is further improved. In addition, the separator has high heat resistance, the electrochemical performance and safety of the battery are improved, and the separator has high application value.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a ceramic composite diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become one of the most important chemical power sources in contemporary times due to their advantages such as high energy density, high output voltage, long cycle life, and environmental friendliness. At present, in addition to being widely used in mobile communications, digital products and other fields, lithium-ion batteries are gradually becoming an important power supply system in the fields of energy storage and electric vehicles. [0003] In lithium-ion batteries, the separator mainly plays the role of isolating positive and negative electrode materials and conducting lithium ions. The performance of the separator directly determines the cycle performance and safety performance of lithium-ion batteries. However, lithium-ion batteries...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M50/403H01M50/409H01M50/434H01M50/463H01M50/497
CPCH01M50/403H01M50/449H01M50/463Y02E60/10
Inventor 石俊黎夏永高刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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