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Battery separator and preparation method thereof, lithium ion battery, and communication equipment

A battery diaphragm and lithium-ion technology, applied in the battery field, can solve the problems of uneven distribution of perfluorosulfonic acid ion exchange resin, easy peeling of perfluorosulfonic acid ion exchange resin layer, and affecting the high-current discharge capacity of lithium-ion batteries. To achieve the effect of improving lithium ion conductivity, shortening the transfer path, and enhancing ion conductivity

Active Publication Date: 2017-02-22
江苏三正新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improved polyolefin diaphragm has the following disadvantages: it will cause the lithium ion channel in the original diaphragm base material 1 to be blocked. Lithium-ion battery high current discharge capacity; at the same time, the improved polyolefin separator prepared by this technology has a complicated process, and the quality of the improved polyolefin separator is difficult to control, which increases the production cost
However, the improved polyolefin separator has the following disadvantages: in the process of coating with ceramic particles, it is easy to produce uneven coating on the surface of the separator (uneven particles, uneven distribution); In the middle, the ceramic coating on the surface of the diaphragm may fall off, which will lead to a decrease in battery performance
However, the improved polyolefin membrane has the following disadvantages: the distribution of perfluorosulfonic acid ion exchange resin is not uniform, and only the functional group on the surface of the polyolefin membrane is -SO 3 Li,-SO 3 There is no connection between Li and the molecules of the polyolefin membrane. During the working process of the membrane, the perfluorosulfonic acid ion exchange resin layer is easy to fall off, thus affecting the performance of the membrane.
In addition, coating the perfluorosulfonic acid ion exchange resin layer on the surface of the polyolefin diaphragm significantly increases the thickness of the diaphragm, thus prolonging the transfer path of lithium ions and affecting the performance of the diaphragm

Method used

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  • Battery separator and preparation method thereof, lithium ion battery, and communication equipment
  • Battery separator and preparation method thereof, lithium ion battery, and communication equipment
  • Battery separator and preparation method thereof, lithium ion battery, and communication equipment

Examples

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Effect test

preparation example Construction

[0032] The example of the present invention also provides a preparation method of the above-mentioned battery diaphragm with simple process, strong conductivity and high liquid absorption rate. For the process flow of the preparation method of the battery separator, please refer to image 3 , including the following steps:

[0033] S01. Sulfonation treatment of polyolefin diaphragm: carry out sulfonation reaction between polyolefin diaphragm and oxidative acid solution dissolved in silver sulfate, wash and dry to obtain sulfonated polyolefin diaphragm;

[0034] S02. Metathesis reaction of polyolefin separator: immerse the polyolefin separator subjected to sulfonation treatment in step S01 into a solution containing lithium ions, perform metathesis reaction for 1 hour to 48 hours, and dry to obtain a battery separator.

[0035]Specifically, during the sulfonation reaction in the above step S01, under the action of an oxidizing acid, part of the hydrogen atoms in the polyolefin...

Embodiment 1

[0055] A battery diaphragm, a preparation method thereof and a lithium ion battery, the preparation method of the battery diaphragm comprises the following steps:

[0056] S11: Soak the PE film in a concentrated sulfuric acid solution with a concentration of 70% and a temperature of 40°C, wherein the concentrated sulfuric acid solution dissolves a silver sulfate catalyst with a concentration of 0.01mol / L, soak the PE film for 30 minutes, take it out, and wipe it with filter paper. Remove surface floating acid, soak in deionized water, rinse, wash away surface floating acid, vacuum dry at 80°C for 1 hour;

[0057] S12: Soak the PE separator after the sulfonation treatment in step S11 in a 0.5 mol / L lithium hydroxide solution at room temperature, take it out after 1 hour, and dry it under vacuum at 80° C. for 1 hour to obtain a battery separator.

[0058] The battery separator prepared in Example 1 is used to prepare a lithium-ion battery: the positive electrode, the battery sep...

Embodiment 2

[0060] A battery diaphragm, a preparation method thereof and a lithium ion battery, the preparation method of the battery diaphragm comprises the following steps:

[0061] S21: Soak the PE film in a chlorosulfonic acid solution with a concentration of 97% and a temperature of 25°C, wherein the chlorosulfonic acid solution dissolves a silver sulfate catalyst with a concentration of 0.01mol / L, soak the PE film for 30 minutes, take it out, and use Wipe off floating acid on the surface of the filter paper, soak in deionized water, rinse, and vacuum dry at 80°C for 1 hour;

[0062] S22: Soak the PE separator after the sulfonation treatment in step S21 in a 0.5 mol / L lithium carbonate solution at room temperature, take it out after 1 hour, and dry it under vacuum at 80° C. for 1 hour to obtain a battery separator.

[0063]The battery separator prepared in Example 2 is used to prepare a lithium-ion battery, and the specific preparation method is the same as that of the lithium-ion ba...

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PUM

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Abstract

The invention provides a battery separator, a preparation method thereof, a lithium ion battery, and a communication device. The battery separator includes a polyolefin separator, and the polyolefin molecule of the polyolefin separator contains -SO3Li and -COOLi groups. The preparation method of the battery diaphragm comprises the following steps: the step of sulfonation treatment of the polyolefin diaphragm; the step of metathesis reaction of the polyolefin diaphragm. The lithium ion battery contains a battery separator prepared by the method. A communication device contains the lithium-ion battery. The battery separator of the present invention has excellent electrolyte affinity, which enhances its liquid retention capacity and ion conductivity, and the lithium ions form a smooth lithium ion transmission channel in the polyolefin separator, so that the lithium ion battery of the present invention has a large current charging capacity. discharge capacity. The preparation method has the advantages of simple process, easy control of conditions, high production efficiency and reduced production cost.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a battery diaphragm and a preparation method thereof, a lithium ion battery, and communication equipment. Background technique [0002] Lithium-ion batteries are mainly composed of positive and negative electrode materials, electrolytes and separators. Among them, the lithium-ion battery separator is one of the main components of the lithium-ion battery. The separator material has a crucial impact on the actual performance of the battery. The separator itself is not only a poor conductor of electrons, but also allows electrolyte ions to pass through. In addition, the separator material must also have good chemical and electrochemical stability and mechanical properties, and maintain a high degree of wettability to the electrolyte during repeated charge and discharge. The performance of the separator determines the interface structure of the battery, the internal re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/409H01M50/417
CPCH01M10/0431H01M50/46Y02E60/10
Inventor 王圣
Owner 江苏三正新能源有限公司
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