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High-temperature-resistant composite diaphragm, preparation method thereof and lithium battery

A composite diaphragm and high temperature resistant technology, which is applied in the direction of lithium batteries, secondary batteries, battery pack components, etc., can solve the problems of battery fire and combustion, poor safety performance, and battery penetration, so as to reduce combustion and explosion and improve safety The effect of simple performance and process

Inactive Publication Date: 2019-12-27
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the use of high-temperature-resistant materials to coat the lithium-ion battery separator can properly improve the thermal stability of the separator. However, when a series of safety accidents occur, the sharp rise in temperature is difficult to control, that is, the current high-temperature-resistant separator is still difficult. Under the high temperature environment caused by thermal runaway, it will start to shrink, even melt, and break through to cause the internal short circuit of the battery, which may further cause the battery to catch fire or explode, and the safety performance is not good. At the same time, this type of separator is also difficult to withstand large impacts or mechanical damage caused by puncture

Method used

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  • High-temperature-resistant composite diaphragm, preparation method thereof and lithium battery
  • High-temperature-resistant composite diaphragm, preparation method thereof and lithium battery
  • High-temperature-resistant composite diaphragm, preparation method thereof and lithium battery

Examples

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preparation example Construction

[0066] The preparation method of the high temperature-resistant composite diaphragm provided in this embodiment, its steps are as follows figure 1 shown, including the following steps:

[0067] Step 110, adding high temperature resistant materials, dispersants, binders, additives and solvents into the pre-mixing tank according to the required ratio, and completely dissolving to obtain the mixture;

[0068] Wherein, the solvent is a polar solvent, including at least one of deionized water, N-methylpyrrolidone (NMP), alcohol or dimethylformamide (DMF);

[0069] Requirements for high-temperature materials, dispersants, binders and additives and their addition ratios are all as above, and will not be repeated.

[0070] Step 120, filtering the mixture with a sieve to obtain a coating slurry;

[0071] Step 130, coating the coating slurry on one or both sides of the base film at a speed of 1 m / min-100 m / min, and drying at 40°C-100°C to obtain a high temperature resistant composite ...

Embodiment 1

[0076] This embodiment provides a high temperature resistant composite diaphragm, including a base film and a coating material coated on the base film and penetrating into the base film. Wherein the base film is a polypropylene porous film with a thickness of 7um, adopts a single-sided coating method, the coating thickness is 10um, and the mass ratio of the coating slurry is: 20% of the composition and 80% of deionized water; wherein, the combination The preparation of the product is according to the mass ratio: 96% high temperature resistant material alumina Al 2 o 3 Powder, 0.5% binder sodium carboxymethylcellulose, 1% styrene-butadiene latex, 1% dispersant sodium dodecylbenzenesulfonate, 0.5% octylphenol polyoxyethylene, 1% Auxiliary polyvinyl alcohol is prepared.

[0077] The high temperature resistant composite diaphragm in this embodiment is prepared by the following method, which specifically includes steps:

[0078] (1) The binder sodium carboxymethyl cellulose, sty...

Embodiment 2

[0084] This embodiment provides a high temperature resistant composite diaphragm, including a base film and a coating material coated on the base film and penetrating into the base film. Wherein the base film is a polypropylene porous film with a thickness of 7um, adopts a single-sided coating method, the coating thickness is 8um, and the mass ratio of the coating slurry is: 30% of the composition and 70% of deionized water; wherein, the combination The preparation of the product is according to the mass ratio: 96% high temperature resistant material alumina and zirconia mixed powder (Al 2 o 3 : ZrO 2 =1:1), 0.5% binder sodium carboxymethylcellulose, 1% styrene-butadiene latex, 1% dispersant sodium dodecylbenzenesulfonate, 0.5% octylphenol polyoxyethylene, 1% additive polyvinyl alcohol.

[0085] The method for preparing the high temperature resistant composite diaphragm is the same as that in Example 1.

[0086] The data of the area to mass ratio of the high temperature-re...

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Abstract

The invention discloses a high-temperature-resistant composite diaphragm, a preparation method thereof and a lithium battery. The high-temperature-resistant composite diaphragm comprises a base membrane with the thickness of 1-50 microns and a coating material with the thickness of 0.5-50 microns, wherein the coating material is coated on the base film or coated on the base membrane and permeatesinto the base membrane; the coating material comprises [86wt%-99.98wt%] of a high-temperature-resistant material, [0.01wt%-10wt%] of a binder, (0wt%-2wt%] of a dispersing agent and (0wt%-2wt%] of an auxiliary agent; the high-temperature-resistant material is a material which stably exists at the temperature of 100-1,000 DEG C and does not cause phase transformation; the particle size of the coating material is between 10 nm and 10 microns, and the coating material is uniformly distributed, hierarchically distributed, gradiently distributed or non-uniformly distributed.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a high temperature resistant composite separator, a preparation method thereof and a lithium battery. Background technique [0002] The most widely used liquid lithium-ion battery is mainly composed of positive electrode material, electrolyte, separator and negative electrode material. The separator is an important part of the liquid lithium-ion battery, and its function is mainly to prevent the positive and negative electrodes of the lithium-ion battery from contacting each other. And cause a short circuit, and at the same time play the role of lithium ion transmission between the positive and negative electrodes inside the battery. Therefore, the diaphragm, as the lithium ion transmission channel inside the liquid lithium ion battery, directly affects the capacity, rate, cycle and safety performance of the battery, so optimizing the performance of the diaphrag...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M10/0525H01M50/403H01M50/411H01M50/434H01M50/491
CPCH01M10/052H01M10/0525H01M50/403H01M50/431H01M50/446H01M50/449Y02E60/10
Inventor 闫昭李帅罗飞陈约李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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