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Non-woven ceramic diaphragm and process for lithium-ion batteries with excellent closed-cell performance

A technology of lithium-ion batteries and ceramic diaphragms, which is applied to battery components, circuits, electrical components, etc., can solve problems such as thermal runaway, high battery temperature, and safety accidents, so as to slow down the release of heat energy, improve safety performance, stick The effect of increased adhesion

Active Publication Date: 2015-09-02
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the lithium-ion battery is pierced, the internal temperature rises sharply. Although the separator has good high temperature resistance, relatively stable dimensions, and has a certain barrier capacity, the high temperature of the battery is prone to thermal runaway, leading to safety accidents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of coating

[0032] Coating formula: the inorganic particle composition is aluminum oxide, and the particle size distribution range is D 10 : 1 μm, D 50 : 2 μm, D 97 : 3μm, accounting for 20% of the total weight of the coating; the melting point of PE micropowder is 120°C, and the particle size distribution range is D 10 : 0.5 μm, D 50 : 1 μm, D 97 : 1.5 μm, accounting for 10% of the total weight of the coating; the adhesive is polyurethane (PU) adhesive, accounting for 5% of the total weight of the coating; the solvent is ethanol.

[0033] Mix the above-mentioned various coating components and stir at room temperature for at least 24 hours to achieve uniform dispersion of the coating.

[0034] 2. Preparation of non-woven ceramic separator

[0035] Specifications of PET non-woven substrate: substrate thickness is 20μm, porosity is 82%, average pore size is 4μm.

[0036] Diaphragm preparation process: The above-mentioned coating is coated on both si...

Embodiment 2

[0039] 1. Preparation of coating

[0040] Coating formula: the inorganic particle composition is 90% aluminum oxide, 5% silicon dioxide and 5% zirconium dioxide (by mass fraction), and the particle size distribution range is D 10 : 1.5 μm, D 50 : 2.5 μm, D 97 : 3.5μm, accounting for 25% of the total weight of the coating; the melting point of PE micropowder is 125°C, and the particle size distribution range is D 10 : 1.0 μm, D 50 : 1.5 μm, D 97 : 2.0 μm, accounting for 15% of the total weight of the coating; the adhesive is polyurethane (PU) adhesive, accounting for 10% of the total weight of the coating; the solvent is ethanol.

[0041] Mix the above-mentioned various coating components and stir at room temperature for at least 24 hours to achieve uniform dispersion of the coating.

[0042]2. Preparation of non-woven ceramic separator

[0043] Specifications of PET non-woven substrate: the thickness of the substrate is 30 μm, the porosity is 68%, and the average pore di...

Embodiment 3

[0047] 1. Preparation of coating

[0048] Coating formula: Inorganic particles are composed of silica, and the particle size distribution range is D 10 : 1 μm, D 50 : 2 μm, D 97 : 3μm, accounting for 22% of the total weight of the coating; the melting point of PE micropowder is 120°C, and the particle size distribution range is D 10 : 0.5 μm, D 50 : 1 μm, D 97 : 1.5 μm, accounting for 14% of the total weight of the coating; the adhesive is polyvinylidene fluoride (PVDF) adhesive, accounting for 8% of the total weight of the coating; the solvent is N, N-dimethylformamide (DMF).

[0049] Mix the above-mentioned various coating components and stir at room temperature for at least 24 hours to achieve uniform dispersion of the coating.

[0050] 2. Preparation of non-woven ceramic separator

[0051] Specifications of PET non-woven substrate: the thickness of the substrate is 25 μm, the porosity is 75%, and the average pore diameter is 3 μm.

[0052] Diaphragm preparation proc...

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PUM

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Abstract

The invention provides a non-woven ceramic membrane with excellent closed-pore performance for a lithium ion battery. The non-woven ceramic membrane comprises a non-woven base material and coatings with the closed-pore performance. The non-woven ceramic membrane is characterized in that the coatings with the closed-pore performance are uniformly coated on the two surfaces of the non-woven base material, the thickness of the non-woven ceramic membrane for the lithium ion battery is 30-50mu m, the porosity of the non-woven ceramic membrane is 40-60%, the average pore diameter of the non-woven ceramic membrane is 0.1-0.5mu m, the closed-pore temperature of the non-woven ceramic membrane is 120-130 DEG C, and the membrane rupture temperature of the non-woven ceramic membrane is 300-500 DEG C. The invention also provides a preparation technology of the non-woven ceramic membrane with the excellent closed-pore performance for the lithium ion battery. The non-woven ceramic membrane has the advantage that the disintegration or explosion of the battery is not easy cause; the adhesive power between the ceramic coating and the base material is increased, and no powder falls off the surface of the membrane under the conditions of bending, rubbing and the like; the consistency of the membrane thickness is substantially improved; and the non-woven ceramic membrane has good high temperature resistance performance, high ion penetrability, low resistance and stable electrochemical property.

Description

technical field [0001] The invention relates to a non-woven ceramic diaphragm for lithium-ion batteries with excellent closed-pore performance and a preparation technology thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] At present, lithium-ion battery separator materials are mainly polyolefin separators, such as single-layer polypropylene (PP) microporous membranes, single-layer polyethylene (PE) microporous membranes, and three-layer PP / PE / PP composite membranes. The melting point of the polyolefin separator is low: the closed cell temperature of the PE separator is 130-140°C, and that of the PP separator is 150-166°C. The separator is easy to shrink when heated, and the direct contact of the positive and negative electrodes will cause a short circuit of the lithium-ion battery, and it is easy to break at high temperature. film, causing disintegration or explosion of the lithium-ion battery. [0003] Non-woven ceramic separ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 杨娇吴立群贺磊
Owner CHINA HAISUM ENG
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