Nanoparticle coated lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery and nanoparticle technology, which is applied to battery components, circuits, electrical components, etc., can solve problems affecting the pore size and pore size distribution of the diaphragm, hidden dangers, battery short-circuit safety, etc., to ensure ion migration performance and improve porosity rate, improve wettability effect

Inactive Publication Date: 2018-07-27
武汉中兴创新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the low melting point of the traditional polyolefin separator, it will shrink after being heated, which will cause a short circuit between the positive and negative electrodes of the battery and there is a serious safety hazard, and the polyolefin separator has poor wettability to the electrolyte, so people Modified research and development of new diaphragm materials
At present, ceramic diaphragms for lithium-ion batteries have appeared. The ceramics used in commercialized mainstream ceramic coating films are inorganic nano-alumina, boehmite, etc., but these inorganic

Method used

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  • Nanoparticle coated lithium ion battery diaphragm and preparation method thereof
  • Nanoparticle coated lithium ion battery diaphragm and preparation method thereof
  • Nanoparticle coated lithium ion battery diaphragm and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0040] Example 1

[0041] The nanoparticles in this example are coated with lithium ion battery separators. The nanoparticles used are aluminum oxide with a porous structure. The porous aluminum oxide is purchased from Sigma-Aldrich with a particle size of 0.5um and the pore size range of the porous channel is 1nm-50nm. The base film used is a PP film with a porosity of 55%.

[0042] The preparation method of the nanoparticle-coated lithium ion battery separator in this example is as follows:

[0043] Add 10 g of porous aluminum oxide to 79.9 g of water and stir evenly with a mechanical stirrer to form a suspension. Add 10 g of sodium carboxymethyl cellulose thickener to the suspension and stir to form a thickened suspension. Add 0.1 g of polyvinyl alcohol binder to the thickened suspension and stir uniformly to form a coating slurry. The coating slurry is uniformly coated on one surface of the base film by a roll coating method to obtain a base film coated with nanoparticles. T...

Example Embodiment

[0044] Example 2

[0045] This example is similar to Example 1, but when preparing the coating slurry, the amount of porous aluminum oxide used is 30g, water 60g, sodium carboxymethyl cellulose thickener 5g, and polyvinyl alcohol binder 5g; The rest are the same as in Example 1.

[0046] After using the same drying method as in Example 1, the nanoparticle-coated lithium ion battery separator of this example was obtained.

Example Embodiment

[0047] Example 3

[0048] This example is similar to Example 1, but when preparing the coating slurry, the amount of porous aluminum oxide used is 60g, water 29.5g, sodium carboxymethyl cellulose thickener 0.5g, polyvinyl alcohol binder 10g; the rest are the same as in Example 1.

[0049] After using the same drying method as in Example 1, the nanoparticle-coated lithium ion battery separator of this example was obtained.

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Abstract

The application discloses a nanoparticle coated lithium ion battery diaphragm and a preparation method thereof. The nanoparticle coated lithium ion battery diaphragm comprises a basal membrane and nanoparticles coated on at least one surface of the basal membrane, wherein the nanoparticles have porous structures, and at least a part of channels penetrate the surface of the nanoparticles. The nanoparticle coated lithium ion battery diaphragm employs the nanoparticles with the porous structures to prepare a coating, the nanoparticles with the porous structures have developed channel structures,lithium ions can diffuse in gaps between nanoparticles, and lithium ions can freely diffuse in the internal channels in the porous structures of the nanoparticles, in order to improve porosity of thediaphragm with the nanoparticle coating, and improve wettability of diaphragm electrolyte. The nanoparticle coated lithium ion battery diaphragm keeps heat resistance of the traditional diaphragms with nanoparticle coatings, and at the same time improves conductivity of lithium ions, so that batteries have high rate performance and long circulation performance.

Description

technical field [0001] The present application relates to the field of lithium-ion battery separators, in particular to a lithium-ion battery separator coated with nanoparticles and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in various daily fields because of their advantages such as high energy density, environmental protection, light weight, good charge and discharge performance, and good safety performance. With the increase of people's demand for clean energy, their usage is also growing. Lithium-ion battery separator is one of the four main materials of lithium-ion batteries. At present, the commonly used commercial lithium-ion battery separators are single-layer or multi-layer porous films of polyolefins such as polyethylene (PE) and polypropylene (PP). [0003] Due to the low melting point of the traditional polyolefin separator, it will shrink after being heated, which will cause a short circuit between t...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/417H01M50/434H01M50/491
CPCH01M50/431H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 杨成张胜刚麻小挺王会娜王哲
Owner 武汉中兴创新材料技术有限公司
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