阅读说明：本技术 一种锂离子电池隔膜的处理方法及锂离子电池 (Lithium ion battery diaphragm processing method and lithium ion battery ) 是由 陈海初 于 2019-09-26 设计创作，主要内容包括：本发明属于锂离子电池领域,公开了一种锂离子电池隔膜的处理方法及锂离子电池。该处理方法包括以下步骤：在隔膜的两面均涂覆一层滑石粉、黄油和乙醇的混合物,然后烘干除去乙醇即得到处理后的锂离子电池隔膜。黄油与滑石粉混合在一起时,当外界加热时,滑石粉具有隔热功能,使黄油不易融化或软化,因此当电池处于高温时,黄油仍为固态,阻止隔膜收缩,提高电池安全性能。当滑石粉、黄油和乙醇的重量比为100:20-40:50,涂覆量在10-30g/m<Sup>2</Sup>时,锂离子电池在保证安全性能的同时也具有较好的电池容量。(The invention belongs to the field of lithium ion batteries, and discloses a processing method of a lithium ion battery diaphragm and a lithium ion battery. The processing method comprises the following steps: and coating a layer of mixture of talcum powder, butter and ethanol on both sides of the diaphragm, and drying to remove ethanol to obtain the processed lithium ion battery diaphragm. When the butter and the talcum powder are mixed together, when the talcum powder is heated from the outside, the talcum powder has a heat insulation function, so that the butter is not easy to melt or soften, and therefore when the battery is at a high temperature, the butter is still solid, the diaphragm is prevented from shrinking, and the safety performance of the battery is improved. When the weight ratio of talcum powder, butter and ethanol is 100:20-40:50, the coating amount is 10-30g/m 2 Meanwhile, the lithium ion battery has better battery capacity while ensuring the safety performance.)

1. A method for processing a lithium ion battery diaphragm is characterized in that a layer of mixture of talcum powder, butter and ethanol is coated on both sides of the diaphragm, and then the diaphragm is dried to remove the ethanol.

2. The method for processing the lithium ion battery separator according to claim 1, wherein:

the butter is high-temperature butter with a melting point of more than 200 ℃.

3. The method for processing the lithium ion battery separator according to claim 1 or 2, characterized in that:

the weight ratio of the talcum powder to the butter to the ethanol is 100:20-40: 50.

4. The method for processing the lithium ion battery separator according to claim 1 or 2, characterized in that:

the weight ratio of the talcum powder to the butter to the ethanol is 100:30: 50.

5. The method for processing the lithium ion battery separator according to claim 1 or 2, characterized in that:

the coating proportion is that 10-30g of mixture of talcum powder, ethanol and butter is coated on each surface of each square meter of diaphragm.

6. The method for processing the lithium ion battery separator according to claim 1 or 2, characterized in that:

the diaphragm is a lithium ion battery diaphragm which is conventionally used in the field.

7. The method for processing a lithium ion battery separator according to claim 6, wherein:

the diaphragm is a PE diaphragm or a PP diaphragm.

8. A lithium ion battery separator treated according to the method of any one of claims 1 to 7.

9. A lithium ion battery characterized by comprising the lithium ion battery separator of claim 8.

Technical Field

The invention belongs to the field of lithium ion batteries, and particularly relates to a processing method of a lithium ion battery diaphragm and a lithium ion battery.

Background

When a lithium ion battery is at a high temperature, because a diaphragm is easy to shrink, the positive electrode and the negative electrode are in direct contact and safety problems are caused.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention mainly aims to provide a method for treating a lithium ion battery diaphragm;

the invention also aims to provide the lithium ion battery diaphragm obtained by the processing method;

the invention further aims to provide a lithium ion battery comprising the separator.

The purpose of the invention is realized by the following scheme:

a method for processing a lithium ion battery diaphragm comprises the steps of coating a layer of mixture of talcum powder, butter and ethanol on two surfaces of the diaphragm, and drying to remove the ethanol, so that the processed lithium ion battery diaphragm is obtained.

The weight ratio of the talcum powder to the butter to the ethanol is 100:20-40:50, preferably 100:30: 50;

the coating proportion is that 10-30g of mixture of talcum powder, ethanol and butter is coated on each surface of each square meter of diaphragm;

the drying refers to drying at 45-65 ℃ to remove ethanol;

the butter is high-temperature butter, and the melting point is more than 200 ℃;

the diaphragm is a lithium ion battery diaphragm which is conventionally used in the field, preferably a PE diaphragm, a PP diaphragm and the like;

a lithium ion battery separator obtained by the above treatment method.

A lithium ion battery comprises the lithium ion battery diaphragm.

Compared with the prior art, the invention has the following advantages and beneficial effects:

when the butter and the talcum powder are mixed together, and when the talcum powder is heated from the outside, the talcum powder has a heat insulation function, so that the butter is not easy to melt or soften, and therefore when the battery is at a high temperature, the butter is still in a solid state, the diaphragm is prevented from shrinking, and the safety performance of the battery is improved; and the talcum powder contains elements such as magnesium, aluminum, silicon and the like, and has a flame-retardant function.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.