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Fire-retardant ceramic diaphragm for lithium battery and preparation method thereof

A technology for ceramic diaphragms and lithium batteries, applied in secondary batteries, battery pack components, circuits, etc., to achieve excellent processing performance, shrinkage prevention, and excellent high temperature resistance

Active Publication Date: 2015-04-01
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used separator materials are polypropylene (PP) or polyethylene (PE), and the melting point is generally between 200°C and 300°C. After the battery thermal runaway occurs, as the temperature rises rapidly, the separator will not be supported by a rigid oxide. It will still shrink and cannot fundamentally solve the safety problem of the diaphragm

Method used

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  • Fire-retardant ceramic diaphragm for lithium battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0017] A ceramic diaphragm for lithium batteries with flame-retardant properties. The diaphragm substrate of the diaphragm is made of composite cross-linked polypropylene (PP) and polyimide (PI), and the flame retardant is added into the diaphragm through a dry process In the frame, the ceramic powder is coated on the surface of the separator by a coating machine, and a ceramic separator for lithium-ion batteries with flame-retardant properties can be obtained.

[0018] Its specific preparation method comprises the following steps:

[0019] A. Preparation of flame retardant membrane substrate:

[0020] Mix polypropylene powder (PP) and polyimide (PI) powder at a mass ratio of 1:1 to form a mixed powder (PP-PI), and melamine polyphosphate (MPP) and mixed powder (PP-PI) ) in a mass ratio of 1:3, and melted at 520°C, then extruded, stretched, tableted, and cooled to form a film with a thickness of 10-40μm.

[0021] B. Coating of ceramic powder:

[0022] According to polyviny...

Embodiment 2

[0032] A preparation method of a ceramic diaphragm for a lithium-ion battery with flame-retardant properties comprises the steps:

[0033] A. Preparation of Flame Retardant Membrane Substrate

[0034] Mix polypropylene powder (PP) and polyimide (PI) powder at a mass ratio of 1:1 to form a mixed powder (PP-PI), and mix melamine cyanurate (MCA) and mixed powder (PP- PI)) was mixed and stirred evenly at a mass ratio of 1:9, and melted at 520°C, then extruded, stretched, tableted, and cooled to form a film with a thickness of 10-40μm.

[0035] B. Coating of ceramic powder

[0036] According to polyvinylidene fluoride (PVDF, HSV900): Al 2 o 3 The ratio of powder = 1:9 is stirred in N-methylpyrrolidone (NMP) evenly, and configured into a slurry, and the configured slurry is coated on the prepared separator substrate with a coating machine to form a 2μm-10μm The coating is dried in a coating machine oven at 75°C and rolled up for later use to form a flame-retardant ceramic diap...

Embodiment 3

[0039] A preparation method of a ceramic diaphragm for a lithium-ion battery with flame-retardant properties comprises the steps:

[0040] A. Preparation of Flame Retardant Membrane Substrate

[0041] Mix polypropylene powder (PP) and polyimide (PI) powder at a mass ratio of 1:1 to form a mixed powder (PP-PI), and decabromodiphenylethane (TDE) and mixed powder (PP -PI) mixed uniformly at a mass ratio of 1:6, and melted at 520°C, then extruded, stretched, tableted, and cooled to form a film with a thickness of 10-40μm.

[0042] B. Coating of ceramic powder

[0043] According to polyvinylidene fluoride (PVDF, HSV900): Al 2 o 3 The ratio of powder = 1:9 is stirred in N-methylpyrrolidone (NMP) evenly, and configured into a slurry, and the configured slurry is coated on the prepared separator substrate with a coating machine to form a 2μm-10μm The coating is dried in a coating machine oven at 75°C and rolled up for later use to form a flame-retardant ceramic diaphragm.

[0...

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Abstract

The invention discloses a fire-retardant ceramic diaphragm for a lithium battery. The ceramic diaphragm comprises a diaphragm substrate which is formed by compounding polypropylene (PP) and polyimide (PI). A fire retardant is added into the diaphragm substrate, and then a ceramic powder is coated on the surface of the diaphragm substrate. The ceramic diaphragm for a lithium battery has excellent high temperature resistance, and also can maintain excellent processing characteristics. Through support of a surface rigid oxide of the diaphragm, triple protection is formed. Thus, safety is further raised.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a ceramic separator for lithium ion batteries with flame-retardant properties and a preparation method thereof. Background technique [0002] With the global energy shortage, environmental pollution, and intensified greenhouse effect, compared with traditional fuel vehicles, electric vehicles have zero emissions and no pollution. As the development trend of replacing fuel vehicles in the future, electric vehicles have emerged as the times require. The power battery is the core of the electric vehicle, and the diaphragm is the bottleneck of the development of the electric vehicle power battery. The traditional diaphragm shrinks easily at high temperature and causes a short circuit in the battery, which restricts the stability, safety and reliability of the electric vehicle. In recent years, starting from improving the safety of power batteries, ceramic diaphragms have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/417H01M50/423H01M50/449H01M50/489
CPCH01M10/0525H01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 廖小东黄兴兰汤勇李明科
Owner 中国东方电气集团有限公司
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