Novel lithium ion battery diaphragm with inorganic coating and preparation method thereof

A technology for lithium-ion batteries and inorganic coatings, applied in coatings, battery pack components, circuits, etc., can solve problems such as the limitation of the electrical performance of the separator and the reduction of the mechanical performance of the separator, and achieve improved electrolyte wettability and increased porosity , the effect of high production efficiency
CN103107301AInactive Publication Date: 2013-05-15INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Publication Date
2013-05-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the field of lithium ion battery diaphragm preparation, and particularly relates to a novel high-temperature-resistant lithium ion battery diaphragm with an inorganic coating, and a preparation method of the diaphragm. The lithium ion battery diaphragm comprises a porous flexible base diaphragm, and a coating coated on both sides of the base diaphragm, wherein the coating is a mixture containing zeolite particles and a bonding agent. The preparation method comprises the steps of dispersing the zeolite particles and the bonding agent in a solvent according to certain ratio to obtain uniform coating slurry; depositing the slurry on both sides of the flexible organic base diaphragm; and drying at certain temperature to obtain the composite diaphragm with good performances. According to the invention, the zeolite particles have excellent performances, high hydrophilicity, developed three-dimensional porous structure and are of an aluminosilicate crystalline structure, so that the high temperature resistance and electrolyte wettability of the diaphragm are improved greatly; and the composite lithium ion battery diaphragm prepared by the method has the advantages of excellent comprehensive performance and the like, and is suitable for large-scale and large-size production.
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Description

technical field

[0001] The invention relates to the field of lithium-ion battery diaphragm preparation, in particular to a high-temperature-resistant lithium-ion battery diaphragm with a novel inorganic coating and a preparation method thereof. Background technique

[0002] Lithium-ion batteries have become the main power source of various portable electronic products due to their advantages such as high working voltage, high energy density, no memory effect, long cycle life and low self-discharge. With the establishment of the national "Energy Saving and New Energy Automobile Industry Development Plan", lithium-ion batteries and related materials will develop rapidly.

[0003] Lithium-ion batteries are composed of four parts: positive electrode, negative electrode, electrolyte and separator. As the key material of lithium-ion batteries, the current commercialized lithium battery separators are mainly polyethylene and polypropylene microporous membranes, but due to the limi...

Claims

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