Isolation membrane and lithium ion secondary battery

A technology of separator and microporous membrane, which is applied in secondary batteries, battery pack components, circuits, etc., can solve the problem that cannot meet the high kinetic performance and long cycle life of lithium ion secondary batteries, and the electrolyte liquid retention performance is increased. limited and other problems, to achieve the effect of improving ionic conductivity, good safety performance, and high ionic conductivity

Active Publication Date: 2017-01-11
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main material of the ceramic layer is generally inorganic ceramic particles with a solid core structure such as alumina, and the surface of the ceramic layer is inert, and the liquid retention performance of the electrolyte is limited, which cannot meet the high dynamic performance and long cycle of lithium-ion secondary batteries. Life requirements, and for abuses such as overcharging, the ceramic layer needs to reach a certain thickness to achieve a better inhibitory effect

Method used

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preparation example Construction

[0029] The method for preparing a separator according to the second aspect of the present invention is used to prepare the separator described in the first aspect of the present invention, comprising the steps of: combining functionalized porous cross-linked polymer microspheres, inorganic ceramic particles and a polymer binder It is added into a solvent and stirred to form a coating slurry; the coating slurry is coated on at least one surface of the microporous membrane, and the isolation membrane is obtained after drying.

[0030] The preparation method of the isolation film according to the second aspect of the present invention is simple and easy to realize industrial production.

[0031] In the method for preparing a separator according to the second aspect of the present invention, the solvent may be deionized water. Using deionized water as a solvent is not only safe and environmentally friendly, but also can reduce production costs.

[0032] In the method for preparin...

Embodiment 1

[0037] 1. Preparation of Isolation Membrane

[0038] (1) The main polymerization monomer styrene, the functional monomer acrylic acid, the crosslinking agent divinylbenzene and the dispersant polyvinyl methyl ether are polymerized at a mass ratio of 12:4:4:4 to obtain a particle size of 0.5 μm, functionalized porous cross-linked polymer microspheres with a cross-linking degree of 80% and a pore size of 0.05 μm;

[0039] (2) Functionalized porous cross-linked polymer microspheres and inorganic ceramic particles with a particle size of 0.6 μm 2 o 3 And the pure acrylic emulsion of the polymer binder is added to the solvent deionized water in a mass ratio of 50:45:5, and stirred evenly to make a coating slurry;

[0040] (3) Coating the coating slurry on both surfaces of a microporous polyethylene film with a thickness of 9 μm, a micropore diameter of 0.05 μm, and a porosity of 40% by gravure printing, and obtained a strip after drying. A coated separator, wherein the thickness...

Embodiment 2

[0048] Lithium-ion secondary batteries were prepared according to the method of Example 1, except for the following differences:

[0049] 1. Preparation of Isolation Membrane

[0050] (1) The main polymerization monomer styrene, the functional monomer acrylic acid, the crosslinking agent divinylbenzene and the dispersant polyvinyl methyl ether are polymerized at a mass ratio of 12:4:2:2 to obtain a particle size of 1.0 μm, functionalized porous cross-linked polymer microspheres with a cross-linking degree of 40% and a pore size of 0.05 μm.

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Abstract

The invention provides an isolation membrane and a lithium ion secondary battery. The isolation membrane comprises a microporous membrane with micropores, and a coating layer which is coated on the surface of the microporous membrane, wherein the coating layer comprises functionalized porous cross-linked polymer microspheres, inorganic ceramic particles and a polymer binder; the functionalized porous cross-linked polymer microspheres comprise functionalized cross-linked polymer; the functionalized cross-linked polymer comprises functionalized groups; and the functionalized groups are selected from one or more of carboxyl, hydroxyl, cyano, acylamino, and amino. The lithium ion secondary battery comprises the isolation membrane. The isolation membrane provided by the invention has relatively high liquid absorption amount, relatively high ionic conductivity and relatively low thermal shrinkage. The lithium ion secondary battery provided by the invention has relatively high safety performance, low-temperature discharge performance, rate capability, and room-temperature cycle performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a separator and a lithium ion secondary battery. Background technique [0002] At present, most of the separators used in lithium-ion secondary batteries are polyolefin films, such as polyethylene film (PE), polypropylene film (PP) or polypropylene / polyethylene / polypropylene composite film (PP / PE / PP), When the lithium-ion secondary battery is abused, such as overcharge, thermal shock or puncture, the temperature of the lithium-ion secondary battery will generally reach above 90°C. At this time, the traditional polyolefin film will have a large shrinkage, resulting in Short circuit with the negative electrode, the phenomenon of thermal runaway occurs, which makes the lithium-ion secondary battery easy to catch fire or even explode. In addition, as the demand for lithium-ion secondary batteries with high energy density and high kinetic performance in the market is getting high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/411H01M50/434H01M50/443H01M50/446H01M50/449H01M50/491
CPCH01M10/0525H01M50/446Y02E60/10
Inventor 平翔何方波张盛武程文强
Owner CONTEMPORARY AMPEREX TECH CO
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