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An electric car battery diaphragm and their preparation methods

A lithium battery separator, electric vehicle technology, applied in battery pack parts, separators/films/diaphragms/spacers, circuits, etc., can solve problems such as reduced service life, poor environmental protection, and polyolefin molecular chain breakage, etc. Achieve the effect of improving strength and porosity, improving heat resistance, and excellent heat resistance

Inactive Publication Date: 2019-05-07
山西天朔电动汽车有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of high-energy particles for the reaction consumes a lot of energy. At the same time, the high-energy particles will also cause the breakage of the polyolefin molecular chain when initiating the reaction, resulting in the aging of the diaphragm and reducing the service life.
In addition, there are a lot of studies on polyolefin separators for lithium batteries, such as surface coating modification to improve the lyophilicity of polyolefin separators, and coating modification to improve the safety of polyolefin separators. However, these methods are complicated in process and poor in environmental protection. Air permeability, lyophilicity and safety, and high cost, difficult to popularize and apply

Method used

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  • An electric car battery diaphragm and their preparation methods
  • An electric car battery diaphragm and their preparation methods

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preparation example Construction

[0052] Correspondingly, the present invention also provides a preparation method of a lithium battery diaphragm for an electric vehicle, comprising the following steps: (1) adding 0.5-1 weight part of a coupling agent to 1-4 weight parts of potassium titanate whiskers, and stirring to obtain Activation of potassium titanate whiskers: uniformly mixing the activated potassium titanate whiskers, 94-98 parts by weight of polypropylene and 0.5-1 parts by weight of chain extender to obtain a layer A mixture.

[0053] (2) Mix 94-97 parts by weight of polyethylene, 2-4 parts by weight of azobisisobutyronitrile, and 1-2 parts by weight of dicumyl peroxide to obtain the layer B mixture.

[0054] (3) Add the layer A mixture and the layer B mixture to the corresponding extruders respectively, and obtain lithium battery separators for electric vehicles through three-layer co-extrusion and biaxial stretching.

[0055] The temperature of the extruder is A layer: the first zone is 120-145°C, ...

Embodiment 1

[0070] Weigh various raw materials according to the ratio of mass and number stated below

[0071] Layer A:

[0072] 98 parts by weight of polypropylene

[0073] Potassium titanate whiskers 1 part by weight

[0074] Coupling agent isopropyl tris (dioctyl pyrophosphate acyloxy) titanate 0.5 parts by weight

[0075] Chain extender benzoyl peroxide 0.5 parts by weight

[0076] Layer B:

[0077] Polyethylene 97 parts by weight

[0078] Azobisisobutyronitrile 2 parts by weight

[0079] Dicumyl peroxide 1 part by weight

[0080] The preparation method of a lithium battery diaphragm for electric vehicles is as follows:

[0081] (1) Add 0.5 parts by weight of coupling agent to 1 part by weight of potassium titanate whiskers and stir to obtain activated potassium titanate whiskers; combine the activated potassium titanate whiskers, 98 parts by weight of polypropylene and 0.5 parts by weight of Parts of chain extender are mixed evenly to obtain layer A mixture.

[0082] (2) 97 ...

Embodiment 2

[0091] Weigh various raw materials according to the ratio of mass and number stated below

[0092] Layer A:

[0093] 94 parts by weight of polypropylene

[0094] Potassium titanate whiskers 4 parts by weight

[0095] Coupling agent isopropyl tris (dioctyl pyrophosphate acyloxy) titanate 1 part by weight

[0096] Chain extender benzoyl peroxide 1 part by weight

[0097] Layer B:

[0098] Polyethylene 94 parts by weight

[0099] Azobisisobutyronitrile 4 parts by weight

[0100] Dicumyl peroxide 2 parts by weight

[0101] The preparation method of a lithium battery diaphragm for electric vehicles is as follows:

[0102] (1) Add 1 part by weight of coupling agent to 4 parts by weight of potassium titanate whiskers and stir to obtain activated potassium titanate whiskers; combine the activated potassium titanate whiskers, 94 parts by weight of polypropylene and 1 part by weight of Parts of chain extender are mixed evenly to obtain layer A mixture.

[0103] (2) 94 parts by ...

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Abstract

The invention provides a lithium battery diaphragm for an electric vehicle and a preparation method thereof. The lithium battery diaphragm is a polyolefin diaphragm with an A / B / A structure and is prepared by a three-layer co-extrusion and biaxial stretching process. Layer A is composed of polypropylene, potassium titanate whiskers, coupling agent, and chain extender. Layer B is composed of polyethylene, azobisisobutyronitrile, and dicumyl peroxide. The lithium battery separator provided by the invention can be used for high-power lithium batteries such as electric vehicles, has lyophilicity, good air permeability, and excellent heat resistance, and can improve the safety of high-power lithium batteries. The method provided by the invention is environmentally friendly, convenient for large-scale production, and beneficial to reducing the cost of lithium battery separators.

Description

technical field [0001] The invention belongs to the technical field of lithium battery separators, and more specifically relates to a lithium battery separator for electric vehicles and a preparation method thereof. Background technique [0002] Compared with traditional rechargeable batteries, lithium-ion batteries have the characteristics of high specific energy, fast charge and discharge, long charge and discharge cycle life, no memory effect, low self-discharge rate, good safety performance and low environmental pollution, so since the century Since the beginning of the 1990s, lithium-ion batteries have become a hot spot in the research of new power supply technologies. Lithium-ion batteries are widely used in the fields of electronic products such as notebook computers, mobile phones, video cameras, and cameras, as well as in fields such as electric vehicles, aerospace, and submarines. The diaphragm is one of the important components of the lithium-ion battery, and its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/446H01M50/449
CPCH01M50/409H01M50/403Y02E60/10
Inventor 李英
Owner 山西天朔电动汽车有限公司