Wet nonwoven fabric ceramic diaphragm of lithium ion power battery and preparation method thereof

A technology for ceramic diaphragms and power batteries, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of powder drop and low uniformity, damage, safety concerns, etc., achieve fast ion migration speed and reduce baking Time, the effect of improving productivity

Inactive Publication Date: 2016-05-11
黄博然
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic polymer separators mainly include polyethylene film, polypropylene film, etc. This kind of separator has poor heat resistance, low porosity, and is easily deformed by heat, which will cause the positive and negative electrodes to contact each other and cause internal short circuit, which may eventually cause thermal runaway or Explosion, there are great hidden concerns in terms of safety
At the same time, due to the limitation of the preparation process, this type of diaphragm will suffer irreversible damage after

Method used

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  • Wet nonwoven fabric ceramic diaphragm of lithium ion power battery and preparation method thereof
  • Wet nonwoven fabric ceramic diaphragm of lithium ion power battery and preparation method thereof
  • Wet nonwoven fabric ceramic diaphragm of lithium ion power battery and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0032] The preparation method of the ceramic diaphragm comprises the following steps: first preparing a ceramic solution, and then coating the ceramic solution on the surface of a base body to obtain a wet-process non-woven ceramic diaphragm for a lithium-ion power battery.

[0033] Preferably, the method of coating the ceramic solution on the surface of the substrate is at least one of dimple coating, extrusion coating, dip coating and spray coating.

Example Embodiment

[0035] Example 1:

[0036] Select area density 6~10g / m 2 The wet-laid non-woven fabric is used as the substrate; the mass percentage of each raw material in the prepared ceramic solution is as follows: ceramic powder (SiO 2 ): 20%; carboxymethyl cellulose: 2%; styrene-butadiene rubber 8%; deionized water: 70%.

[0037] The ceramic solution is coated on the surface of a wet-laid non-woven fabric substrate by means of extrusion coating, and dried to obtain a ceramic separator.

[0038] The SEM image of the ceramic diaphragm prepared in this embodiment is as follows figure 1 , where (a) is the SEM image of the front of the ceramic diaphragm, and (b) is the SEM image of the cross-section of the ceramic diaphragm.

[0039] The shrinkage test comparison chart of polypropylene diaphragm, polyethylene ceramic diaphragm, polypropylene ceramic diaphragm and the ceramic diaphragm prepared in this embodiment is as follows figure 2 As shown, where (a) is the polypropylene diaphragm ...

Example Embodiment

[0043] Example 2:

[0044] Select surface density 10~15g / m 2 The wet-laid non-woven fabric is used as the substrate; the mass percentage of each raw material in the prepared ceramic solution is as follows: ceramic powder (Al(OH) 3 ): 22%; carboxymethyl cellulose: 1%; styrene-butadiene rubber: 10%; deionized water: 67%.

[0045] The ceramic solution is coated on the surface of a wet-laid non-woven fabric substrate in a dimple coating manner, and dried to obtain a ceramic separator.

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Abstract

The invention discloses a wet nonwoven fabric ceramic diaphragm of a lithium ion power battery and a preparation method of the wet nonwoven fabric ceramic diaphragm. The wet nonwoven fabric ceramic diaphragm is formed by a substrate and a single-surface or double-surface coating layer, wherein the substrate is wet nonwoven fabric; the coating layer is obtained by coating the surface of the substrate with a ceramic solution. The preparation method of the wet nonwoven fabric ceramic diaphragm comprises the following steps of firstly preparing the ceramic solution, and then coating the surface of the substrate with the ceramic solution, thus obtaining the wet nonwoven fabric ceramic diaphragm of the lithium ion power battery. The wet nonwoven fabric ceramic diaphragm disclosed by the invention has the advantages that the porosity is ideal, the ion migration speed is quick, the permeability speed of electrolyte during liquid injection is quick, and the production efficiency is high; the temperature resistance is good, the preparation operation is simple, and the energy consumption is low; the wet nonwoven fabric ceramic diaphragm has high temperature resistance and low shrink, the wet nonwoven fabric ceramic diaphragm cannot shrink immediately when the wet nonwoven fabric ceramic diaphragm is in short circuit as being impaled by a hard matter, and the lithium ion power battery is prevented from burning as the lithium ion power battery is in large-area contact with oxygen.

Description

technical field [0001] The invention relates to a wet-process non-woven ceramic diaphragm for a lithium-ion power battery and a preparation method thereof. Background technique [0002] At present, the common lithium-ion battery separators on the market mainly include: organic polymer separators and single-layer or multi-layer ceramic separators. Organic polymer separators mainly include polyethylene film, polypropylene film, etc. This kind of separator has poor heat resistance, low porosity, and is easily deformed by heat, which will cause the positive and negative electrodes to contact each other and cause internal short circuit, which may eventually cause thermal runaway or The explosion poses a great hidden concern in terms of safety. At the same time, due to the limitation of the preparation process, this type of diaphragm will suffer irreversible damage after being pierced by a hard object. The ceramic powder commonly used in ceramic diaphragms is nano-alumina partic...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/434H01M50/44
CPCH01M10/0525H01M50/403H01M50/449Y02E60/10
Inventor 黄博然
Owner 黄博然
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