Lithium ion battery composite diaphragm and preparation method thereof

A lithium-ion battery and composite diaphragm technology, which is applied in secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve the problem of reducing the electrical insulation of lithium battery diaphragms, reducing the service life of lithium batteries, and damage to lithium batteries and other problems, to achieve the effect of improving electrical insulation and corrosion resistance, improving high temperature resistance, and improving electrical insulation

Pending Publication Date: 2021-07-13
湖南博盛新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the lithium battery is in use, the added electrolyte will be in contact with the electrolyte for a long time, and the electrolyte will corrode the lithium battery diaphragm. After the diaphragm is damaged, the electrical insulation of the lithium battery diaphragm is greatly reduced, resulting in damage to the lithium battery. phenomenon, which greatly reduces the service life of lithium batteries. Therefore, a lithium-ion battery composite diaphragm and its preparation method are proposed.

Method used

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  • Lithium ion battery composite diaphragm and preparation method thereof

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Effect test

Embodiment 1

[0023] see figure 1 , the present invention provides a technical solution: a lithium-ion battery composite diaphragm prepared from the following raw materials:

[0024] The ratio of raw materials by weight is: 5 parts of water, 10 parts of liquid hydrocarbon, 10 parts of polyolefin, 2 parts of binder, 2 parts of high temperature resistant material, 2 parts of flame retardant, 4 parts of graphene, 4 parts of lithium powder, 2 parts of insulating coating, 2 parts of corrosion-resistant coating.

[0025] In this embodiment, specifically: the composition of the flame retardant is one or more of antimony trioxide, magnesium hydroxide and aluminum hydroxide; through the addition of the flame retardant, the flame retardant can absorb the The heat reduces the temperature of the diaphragm, and the flame retardant has a good affinity, which has little effect on the performance of the diaphragm, and the flame retardancy is long-lasting.

[0026] In this embodiment, specifically: the hi...

Embodiment 2

[0037] see figure 1 , the present invention provides a technical solution: a lithium-ion battery composite diaphragm prepared from the following raw materials:

[0038] The ratio of raw materials by weight is: 7 parts of water, 15 parts of liquid hydrocarbon, 15 parts of polyolefin, 3 parts of binder, 3 parts of high temperature resistant material, 3 parts of flame retardant, 5 parts of graphene, 5 parts of lithium powder, 3 parts of insulating coating, 3 parts of corrosion-resistant coating.

[0039] In this embodiment, specifically: the composition of the flame retardant is one or more of antimony trioxide, magnesium hydroxide and aluminum hydroxide; through the addition of the flame retardant, the flame retardant can absorb the The heat reduces the temperature of the diaphragm, and the flame retardant has a good affinity, which has little effect on the performance of the diaphragm, and the flame retardancy is long-lasting.

[0040] In this embodiment, specifically: the hi...

Embodiment 3

[0051] see figure 1 , the present invention provides a technical solution: a lithium-ion battery composite diaphragm prepared from the following raw materials:

[0052] The ratio of raw materials by weight is: 10 parts of water, 20 parts of liquid hydrocarbon, 20 parts of polyolefin, 4 parts of binder, 4 parts of high temperature resistant material, 4 parts of flame retardant, 6 parts of graphene, 6 parts of lithium powder, 4 parts of insulating coating, 4 parts of corrosion-resistant coating.

[0053] In this embodiment, specifically: the composition of the flame retardant is one or more of antimony trioxide, magnesium hydroxide and aluminum hydroxide; through the addition of the flame retardant, the flame retardant can absorb the The heat reduces the temperature of the diaphragm, and the flame retardant has a good affinity, which has little effect on the performance of the diaphragm, and the flame retardancy is long-lasting.

[0054] In this embodiment, specifically: the h...

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Abstract

The invention discloses a lithium ion battery composite diaphragm and a preparation method thereof. The lithium ion battery composite diaphragm is prepared from the following raw materials in parts by weight of 5-10 parts of water, 10-20 parts of liquid hydrocarbon, 10-20 parts of polyolefin, 2-4 parts of a binder, 2-4 parts of a high-temperature-resistant material, 2-4 parts of a flame retardant, 4-6 parts of graphene, 4-6 parts of lithium powder, 2-4 parts of an insulating coating and 2-4 parts of a corrosion-resistant coating. According to the lithium battery diaphragm disclosed by the invention, after chrysotile is added into the raw materials of the lithium battery diaphragm, the chrysotile has relatively higher electrical insulating property, so that the electrical insulating property of the lithium battery diaphragm is greatly improved, and the high-temperature resistance of the diaphragm is improved; the surface of the diaphragm is coated with the insulating coating and the corrosion-resistant coating, and under the action of the insulating coating and the corrosion-resistant coating, the situation that the insulating property of the diaphragm is reduced due to the fact that the diaphragm is damaged by acidic or alkaline substances generated by electrolyte in the lithium battery is avoided; the insulating coating and the corrosion-resistant coating are matched, so that the electrical insulating property and the corrosion resistance of the diaphragm are greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery composite diaphragms, in particular to a lithium-ion battery composite diaphragm and a preparation method thereof. Background technique [0002] Lithium battery is a kind of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and uses non-aqueous electrolyte solution. Lithium battery has the advantages of extremely low self-discharge rate and gentle discharge voltage. The main function of lithium battery separator is to make the battery Separate the positive and negative poles of the battery to prevent the two poles from contacting and short-circuiting. In addition, it also has the function of allowing electrolyte ions to pass through. The material of the separator is non-conductive, and its physical and chemical properties have a great impact on the performance of the battery. The existing When the lithium battery diaphragm is in use, inorganic...

Claims

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Application Information

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IPC IPC(8): H01M50/431H01M50/446H01M50/449H01M50/403H01M50/406H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 张羽标叶淼
Owner 湖南博盛新能源技术有限公司
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