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Lithium ion battery separator containing poly-dopamine and ceramic coatings

A lithium-ion battery and ceramic coating technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of high requirements for equipment and increase the cost of diaphragm treatment, and achieve strong liquid absorption/retaining capacity, Effect of reducing transmission unevenness and improving safety performance

Inactive Publication Date: 2014-03-26
CHINA FIRST AUTOMOBILE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But obviously, these pretreatment methods have higher requirements on

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  • Lithium ion battery separator containing poly-dopamine and ceramic coatings

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Effect test

Embodiment 1

[0015] like figure 1 As shown, a lithium-ion battery separator containing polydopamine and a ceramic coating, the polymer porous membrane substrate 1 is a PP porous membrane, the thickness of the PP layer is 10 μm, the thickness of the polydopamine coating 2 is 30 nm, SiO 2 The thickness of the ceramic layer 3 is 0.5 μm. First, a layer of polydopamine layer 2 is coated on the surface of the diaphragm substrate 1, and then SiO is coated with a slurry containing the above-mentioned inorganic ceramic components. 2 The ceramic layer 3 can be obtained by drying and heat treatment. The electrochemical stability window is above 4.5V, and the separator is suitable for large-capacity lithium-ion batteries.

Embodiment 2

[0017] A lithium-ion battery separator containing polydopamine and a ceramic coating, the polymer porous membrane substrate 1 is a PE porous membrane, the thickness of the PE layer is 40 μm, the thickness of the polydopamine coating 2 is 10 nm, and the thickness of the POSS ceramic layer 3 is 5 μm. First, a layer of polydopamine layer 2 is coated on the surface of the diaphragm substrate 1, and then the POSS ceramic layer 3 is coated with a slurry containing the above-mentioned inorganic ceramic components, dried and heat-treated to obtain it. The closed cell temperature is 135°C. The modified diaphragm and the PE diaphragm were subjected to a heat resistance test at 165°C, and the PE diaphragm shrank by 33%. The modified diaphragm shrinks by 6%. This separator is suitable for high-safety lithium-ion batteries.

Embodiment 3

[0019] A lithium-ion battery separator containing polydopamine and a ceramic coating, the polymer porous membrane substrate is a PP / PE composite porous membrane, the thickness of the PP / PE composite porous membrane is 25 μm, and a layer of polydopamine coating with a thickness of 50 nm is coated , Li x La y TiO 3 The thickness of the ceramic layer is 2 μm. The diaphragm is first coated with a layer of polydopamine layer 2 on the surface of the diaphragm substrate 1, and then coated with a slurry containing the above-mentioned inorganic ceramic components. x La y TiO 3 The ceramic layer 3 can be obtained by drying and heat treatment. Compared with the PP / PE matrix, the liquid absorption rate of the modified diaphragm is increased by 1.3 times.

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Abstract

The invention relates to a lithium ion battery separator containing poly-dopamine and ceramic coatings. The lithium ion battery separator is characterized in that the surfaces of a flexible polymer porous membrane matrix are bonded with the poly-dopamine coatings, and the surface of each poly-dopamine coating is bonded with the ceramic coating, wherein the poly-dopamine coating is subjected to double-surface coating, and the ceramic coating is subjected to double-surface or single-surface coating; the components of the polymer matrix comprise polyethylene and polypropylene; the thickness of the poly-dopamine coating is 10nm-50nm, and the thickness of the ceramic coating is 0.1-5 microns. The separator has high imbibing/retention capability, outstanding rate performance, small thermal shrinking performance and the like; a lithium ion battery with the separator has the advantages of high ionic conductivity, excellent whole cycle performance, high safety and the like, and the separator is especially applicable to the field of power batteries.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm containing polydopamine and a ceramic coating, in particular to a diaphragm that can be used for power lithium-ion batteries. Background technique [0002] The separator is one of the most important components of a lithium-ion battery, which determines the safety, cycle life and power density of the lithium-ion battery. At present, the diaphragm is mainly microporous diaphragm based on polyolefin. However, in terms of product consistency and other aspects, the domestic polyolefin diaphragm technology has not yet reached the level of the United States and Japan. In the field of power batteries, the diaphragm is mainly It is monopolized by foreign high-end diaphragm manufacturers, so it is necessary to develop new high-performance diaphragms with independent intellectual property rights. [0003] The traditional polyolefin separator has poor affinity for the electrolyte, resulting in poor liquid a...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/446H01M50/451H01M50/457H01M50/497
CPCH01M50/449Y02E60/10
Inventor 王丹赵中令张克金于力娜姜涛王金兴安宇鹏荣常如应善强
Owner CHINA FIRST AUTOMOBILE
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