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Lithium ion battery and membrane thereof

A technology for lithium-ion batteries and diaphragms, which is applied in secondary batteries, battery pack components, circuits, etc., and can solve problems such as misalignment between diaphragms and electrodes, failure to form adhesion, and short-circuiting of batteries

Inactive Publication Date: 2012-07-11
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this separator can indeed greatly improve its thermal stability, but the adhesion between the ceramic layer and the electrode cannot be formed. When the battery is subjected to external force, misalignment between the separator and the electrode is prone to occur, and it is also easy to cause battery damage. internal short circuit

Method used

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  • Lithium ion battery and membrane thereof
  • Lithium ion battery and membrane thereof
  • Lithium ion battery and membrane thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of diaphragm:

[0024] A polypropylene (PP) porous membrane is used as the porous membrane substrate 1, and the surface of the porous membrane substrate 1 is firstly treated with a raising agent to enhance its surface tension.

[0025] Silicon dioxide (SiO 2 ) ceramic particles are fully mixed with polyvinylidene fluoride (PVDF) solution to obtain a ceramic material. Then, the ceramic material was coated on both surfaces of the porous membrane substrate 1 by printing and coating, and dried to obtain a ceramic material layer 2 with a thickness of 0.5 μm.

[0026] Polyacrylonitrile (PAN) was formulated into a solution, and then coated on the surface of the ceramic material layer 2 by printing and coating, and dried to obtain a polymer adhesive layer 3 with a thickness of 0.1 μm and a porosity of 30%. .

[0027] Preparation of positive electrode sheet:

[0028] Lithium cobalt oxide (LiCoO 2 ), conductive carbon (Super-P) and polyvinylidene fluoride (PVDF) ...

Embodiment 2

[0034] Preparation of diaphragm:

[0035] Using a polyethylene (PE) porous membrane as the porous membrane base material 1, the porous membrane base material 1 is surface-treated by pressing a roller with an uneven surface to enhance its surface tension.

[0036] Aluminum oxide (Al 2 o 3 ) ceramic particles and sodium carboxymethyl cellulose (CMC) solution are fully mixed to obtain a ceramic material. Then, the ceramic material is coated on both surfaces of the porous membrane substrate 1 by means of extrusion coating, and dried to obtain a ceramic material layer 2 with a thickness of 1 μm.

[0037]Polyethylene oxide (PEO) was formulated into a solution, which was then sprayed onto the surface of the ceramic material layer 2 and dried to obtain a polymer adhesive layer 3 with a thickness of 0.5 μm and a porosity of 40%.

[0038] The preparation method of the lithium-ion battery is the same as that of Example 1, and will not be repeated here.

Embodiment 3

[0040] Preparation of diaphragm:

[0041] Use polypropylene / polyethylene / polypropylene (PP / PE / PP) porous film as the porous film base material 1, first adopt the pressing roller with uneven surface to press the porous film, and the porous film base material 1 is surface treated, with increase its surface tension.

[0042] Titanium dioxide (TiO 2 ) The ceramic particles are fully mixed with the styrene-butadiene rubber (SBR) solution to obtain a ceramic material. Then, the ceramic material was coated on both surfaces of the porous membrane substrate 1 by means of transfer coating, and dried to obtain a ceramic material layer 2 with a thickness of 3 μm.

[0043] Polymethacrylate (PMMA) was formulated into a solution, which was then sprayed on the surface of the ceramic material layer 2 and dried to obtain a polymer adhesive layer 3 with a thickness of 1 μm and a porosity of 50%.

[0044] The preparation method of the lithium-ion battery is the same as that of Example 1, and w...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a membrane for a lithium ion battery, which is good in safety performance and mechanical performance. The membrane for the lithium ion battery comprises a porous membrane substrate, a ceramic material layer coated on the surface of the porous membrane substrate, and a polymer sticking layer which is coated on the ceramic material layer and is located on the surface layer. Compared with the prior art, the ceramic material layer can form a microcosmic physical separation on the surface of the membrane so as to reduce the piercing effect of a lithium pine-tree crystal on the membrane; the ceramic material layer coated on the porous membrane substrate can improve the heat resistance of the membrane; the polymer sticking layer which is coated on the ceramic material layer and has a sticking effect can be used for preventing an inner short circuit caused by staggering of the membrane and an electrode, so that the safety performance of the battery is enhanced. In addition, the membrane, an anode sheet and a cathode sheet are joined together through the effect of the polymer sticking layer, so that the mechanical performance of the battery can be enhanced. Furthermore, the invention further discloses the lithium ion battery containing the membrane.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a diaphragm for lithium ion batteries with good safety performance and mechanical properties and a lithium ion battery comprising the diaphragm. Background technique [0002] Lithium-ion batteries, as a clean new energy source, have been applied in more and more fields, such as mobile phones, notebook computers, electric bicycles and power vehicles. Because these products using lithium-ion batteries as power sources are closely related to people's lives, people's requirements for their safety are getting higher and higher. [0003] Lithium-ion batteries generally include a packaging case and a battery cell contained in the packaging case. The battery cell generally includes a positive electrode, a negative electrode, an electrolyte, and a separator spaced between the positive electrode and the negative electrode. Among them, the separator is a very impo...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525B32B3/30B32B18/00B32B7/12
CPCY02E60/122Y02E60/10
Inventor 陈杰莫明亮胡大林吴凯
Owner NINGDE AMPEREX TECH
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