Ceramic diaphragm for lithium ion battery and preparation method of ceramic diaphragm

A lithium-ion battery, ceramic separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of limited liquid absorption capacity, weak binding force between ceramic particles and binders, and easy to fall off powder. Enhanced stability, enhanced binding force, and the effect of preventing powder drop

Inactive Publication Date: 2016-04-20

TIANNENG SAFT ENERGY JOINT CO

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AI-Extracted Technical Summary

Problems solved by technology

[0005] In the prior art, ordinary ceramic powder is usually used for coating, and the specific surface area is only a dozen m 2 /g to tens of m 2 /g, the l...

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Method used

By the liquid absorption test result, it can be known that the ceramic diaphragm coated with porous structure and high specific surface area ceramic powder is adopted, and its liquid absorption will be much higher than the conventional ceramic diaphragm coated with common ceramic powder , the high liquid absorption rate will help to prolong the cycle life and improve the rate performance.

[0068] From Table 2 and Table 3, it ...

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Abstract

The invention discloses a ceramic diaphragm for a lithium ion battery. The ceramic diaphragm comprises a diaphragm base material and a ceramic coating on the surface of the diaphragm base material, wherein ceramic particles having a porous structure and a high specific surface area are selected for the ceramic coating. A preparation method includes the following steps of firstly, evenly mixing ceramic particles, binder and solvent to obtain coating slurry; secondly, evenly coating the surface of the diaphragm base material with the coating slurry, and conducting drying to form the ceramic diaphragm. Quite strong binding force exists between the porous ceramic powder and the binder, and the powder falling phenomenon is effectively avoided; meanwhile, the ceramic diaphragm has high electrolyte wettability and quite strong liquid absorption capacity, the cycle life and rate capability of the lithium ion battery are increased, and excellent electrochemical performance is achieved; in addition, under the same thickness, the mass of the porous ceramic coating is far lower than that of an ordinary ceramic coating, and the energy density of the battery is improved.

Application Domain

Cell component details

Technology Topic

SolventCeramic particle +12

Examples

Experimental program(5)
Comparison scheme(2)

Example Embodiment

[0038] The preparation method of porous aluminum oxide in the present invention is as follows:

[0039] A 1g/L CTAB (hexadecyltrimethylammonium bromide) aqueous solution was used to prepare 18% aluminum nitrate solution and 8% ammonium bicarbonate solution. The ammonium bicarbonate solution was slowly added dropwise to the aluminum nitrate solution and quickly stirred to form a sol. After standing for a period of time, the sol was vacuum dried to obtain a white powder. The white powder was calcined at 550°C for 2 hours to obtain porous aluminum oxide. . The prepared porous aluminum oxide has a particle size of about 100nm and a specific surface area of 432m 2 /g.

[0040] The preparation method of porous silica in the present invention is as follows:

[0041] Add 2g of CTAB, 10g of 32% ammonia water, and 50g of absolute ethanol to 50mL of deionized water, stir and mix well, add 3.6g of ethyl orthosilicate, stir for 2 hours, filter the white precipitate and wash with deionized water. After drying, calcining at 600℃ for 6 hours to obtain porous silica; the prepared porous silica has a particle size of about 200nm and a specific surface area of 576m 2 /g.

Example Embodiment

[0042] Example 1

[0043] 1. The 1g particle size is about 100nm and the specific surface area is 432m 2 /g of porous aluminum oxide powder, 0.3g of polyvinylidene fluoride (PVDF) and 7.5g of N-methylpyrrolidone (NMP) are mixed uniformly to obtain a ceramic coating slurry.

[0044] 2. The ceramic coating slurry is uniformly coated on one side of a polyethylene (PE) membrane with a thickness of 20μm through a coating machine, and dried in a vacuum (vacuum 0.01MPa) at 80°C to form a coating thickness of 3μm The ceramic diaphragm A1.

Example Embodiment

[0045] Example 2

[0046] 1. The 1.5g particle size is about 200nm and the specific surface area is 576m 2 /g of porous silica powder, 0.1 g of sodium carboxymethyl cellulose (CMC), 0.1 g of styrene butadiene rubber (SBR) and 8 g of deionized water are mixed uniformly to obtain ceramic coating slurry.

[0047] 2. The ceramic coating slurry is uniformly coated on one side of a polypropylene (PP) membrane with a thickness of 20μm through a coating machine, and dried under vacuum (vacuum 0.01MPa) at 80°C to form a coating thickness of 4μm The ceramic diaphragm A2.

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PUM

Property	Measurement	Unit
Specific surface area	>= 200.0	m²/g
Particle size	20.0	nm
Thickness	1.0 ~ 10.0	µm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve binding

Ceramic diaphragm for lithium ion battery and preparation method of ceramic diaphragm

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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