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Sol-coated membrane and preparation method and use thereof

A diaphragm and sol technology, applied in the field of electrochemistry, can solve problems such as combustion, poor consistency, and diaphragm shrinkage

Inactive Publication Date: 2018-06-12
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separator used in lithium-ion batteries is generally a polyolefin-based microporous membrane. Since the melting point of this polyolefin-based microporous membrane is lower than 150°C, it is prone to the following defects: When the battery temperature rises due to internal or external factors When the diaphragm shrinks or melts, the volume of the diaphragm changes
The shrinkage or melting of the separator leads to direct contact between the positive and negative electrodes, resulting in an internal short circuit, which in turn causes accidents such as battery swelling, combustion, and explosion
In addition, because the diaphragm and the positive and negative electrodes in the battery are mainly designed by the reserved size method during battery design, after the battery is manufactured, the positive and negative electrodes are connected to the diaphragm by means of pressure after the positive and negative electrodes are absorbed and expanded. Make the gap in the middle uncontrollable, unable to maintain the consistency of the battery
However, due to the large number and poor consistency of power vehicle batteries, the BMS system cannot be controlled, resulting in safety accidents
[0004] In order to meet the requirements of improving the heat resistance of the battery, relatively dense ceramic particles are generally required, which makes the separator coated with only a ceramic material layer unable to form a good adhesion with the electrodes even under hot pressing. There is still a risk of diaphragm and electrode dislocation

Method used

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  • Sol-coated membrane and preparation method and use thereof

Examples

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preparation example Construction

[0059] In one embodiment of the present invention, the preparation method of described sol coating liquid comprises the following steps:

[0060] (i) take inorganic sol particle and the water as dispersion medium in proportion;

[0061] (ii) Glue making: use a mixer or mixer to stir for more than 1 hour to produce a clear glue;

[0062] (iii) Addition of binder: Add the water-based binder into the clarified glue solution, and use a mixer or mixer to stir for more than 1 hour to form a stable sol solution;

[0063] (iv) Vacuum defoaming: adjust the mixer to slow stirring, vacuumize for 30min, and carry out defoaming;

[0064] (v) Filtration: vacuum filter the above-mentioned degassed sol solution to obtain the sol coating solution required by the present invention.

[0065] In order to improve the surface tension of the obtained sol coating solution, increase the uniformity of coating and coating, the step of adding surfactant can be added between the above-mentioned (iii) st...

Embodiment 1-6

[0108] Preparation of sol-coated separators

[0109] 1) Select the SV10 series PE microporous base film produced by Shanghai Enjie Company, with a thickness of 10 μm;

[0110] 2) The PE microporous base film is passed through the MCD type coating machine (purchased from Fuji Machinery Industry Co., Ltd.), and the sol coating solution described in Table 1 and Table 2 is coated on the PE microporous film through gravure printing at the same time After being baked in an oven, a PE microporous membrane covered with an inorganic sol coating can be prepared, and the thickness of the coating is 2 μm.

[0111] Table 1

[0112]

[0113] Table 2

[0114]

[0115] Note: The proportion of each material is calculated as solid

Embodiment 7-10 and comparative example 2

[0124] Preparation of lithium-ion batteries

[0125] The lithium-ion battery consists of a positive electrode system, a negative electrode system, and an electrolyte system. The positive electrode uses lithium manganese oxide, the negative electrode uses graphite, and the electrolyte uses an EC / EMC system. The concentration of lithium salt (LiPF6) is 1mol / L. Preparation process: the positive electrode is composed of lithium manganese oxide, the negative electrode is composed of graphite, carboxymethyl cellulose (CMC), and styrene-butadiene rubber emulsion in a weight ratio of 100:2:3, and the negative electrode uses water as the solvent to make negative electrode slurry. Diaphragms shown in Table 3. The cut pole pieces are crimped and packed with aluminum-plastic film, organic electrolyte is added in the state of nitrogen, the battery is evacuated and sealed, and then the battery is aged at room temperature for 3 hours, and it is formed into a lithium-ion battery.

[0126] Th...

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Abstract

The invention discloses a sol-coated membrane and a preparation method and use thereof. The membrane contains a membrane substrate and a sol coating coated on the membrane substrate.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a sol-coated separator and its preparation method and application. Background technique [0002] Due to its good chemical stability and excellent physical properties, microporous polyethylene film is widely used in secondary lithium-ion batteries, such as: mobile phone batteries, notebook batteries, power tool batteries and power car batteries. In lithium-ion batteries, the main function of the separator is to separate the positive and negative electrodes of the battery and prevent the two electrodes from contacting and short circuiting. It is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/058H01M50/403H01M50/443H01M50/449H01M50/489H01M50/586
CPCH01M10/0525H01M10/058H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10Y02P70/50
Inventor 程跃苏晓明陈永乐何方波王伟强
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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