Three-layer co-extruded lithium-ion battery separation membrane and production method thereof

A lithium-ion battery, three-layer co-extrusion technology, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of complex components and production methods, increased production costs, etc., to achieve Good promotion and application value, good mechanical strength, single ingredient effect

Active Publication Date: 2015-10-14
HUIQIANG WUHAN NEW ENERGY MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are also some three-layer co-extruded lithium-ion battery separators, but their components and production methods are often complicated, which increases production costs. Layer co-extruded separators, where each layer consists of two to three components, including additives or reinforcing agents, etc.

Method used

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  • Three-layer co-extruded lithium-ion battery separation membrane and production method thereof
  • Three-layer co-extruded lithium-ion battery separation membrane and production method thereof
  • Three-layer co-extruded lithium-ion battery separation membrane and production method thereof

Examples

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Effect test

Embodiment 1

[0023] The three-layer co-extruded lithium-ion battery separator provided in this example has a thickness of 16 μm and includes three layers of A / B / A. The raw material of layer A is H5300 polypropylene resin, the isotacticity is above 98%, and the melt index is : 3.4g / 10min (2.16kg, 230°C); B layer is T30S polypropylene resin, the isotacticity is also above 98%, and the melt index is 2.5g / 10min (2.16kg, 230°C); The thickness of the A layer is the same, and the thickness of the B layer is 2.5 times of the single A layer thickness.

[0024] The preparation method of the three-layer co-extruded lithium-ion battery diaphragm provided in this embodiment comprises the following steps:

[0025] a. Melting step: Add H5300 and T30S polypropylene resin to two different extruder inlets to melt and plasticize. The temperature of the conveying section is 50°C, the temperature of the compression section is 170°C, the temperature of the metering section is 200°C, and the rotation speed is 6...

Embodiment 2

[0030] The three-layer co-extruded lithium-ion battery separator provided in this example has a thickness of 16 μm and includes three layers of A / B / A. The raw material of layer A is H5300 polypropylene resin, the isotacticity is above 98%, and the melt index is : 3.4g / 10min (2.16kg, 230°C); B layer is T30S polypropylene resin, the isotacticity is also above 98%, and the melt index is 2.5g / 10min (2.16kg, 230°C); The thickness of the A layer is the same, and the thickness of the B layer is twice the thickness of a single A layer.

[0031] The preparation method of the three-layer co-extruded lithium-ion battery diaphragm provided in this embodiment comprises the following steps:

[0032] a. Melting step: Add H5300 and T30S polypropylene resin to two different extruder inlets to melt and plasticize respectively, where the temperature of the conveying section is 65°C, the temperature of the compression section is 190°C, the temperature of the metering section is 220°C, and the rot...

Embodiment 3

[0037] The three-layer co-extruded lithium-ion battery separator provided in this example has a thickness of 32 μm and includes three layers of A / B / A. The raw material of layer A is H5300 polypropylene resin, the isotacticity is above 98%, and the melt index is : 3.4g / 10min (2.16kg, 230°C); B layer is T30S polypropylene resin, the isotacticity is also above 98%, and the melt index is 2.5g / 10min (2.16kg, 230°C); The thickness of the A layer is the same, and the thickness of the B layer is 3 times of the thickness of a single A layer.

[0038]The preparation method of the three-layer co-extruded lithium-ion battery diaphragm provided in this embodiment comprises the following steps:

[0039] a. Melting step: Add H5300 and T30S polypropylene resin to two different extruder inlets to melt and plasticize respectively, where the temperature of the conveying section is 75°C, the temperature of the compression section is 210°C, the temperature of the metering section is 235°C, and the...

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Abstract

The present invention belongs to the technical field of lithium-ion battery separation membrane production, and particularly relates to a three-layer co-extruded lithium-ion battery separation membrane and a production method thereof. The three-layer co-extruded lithium-ion battery separation membrane comprises an A / B / A three-layer coextruded polypropylene resin microporous film, wherein the layer A and the layer B are two different polypropylene resins, the separation membrane thickness is 12-50 [mu]m, and the tensile strength in the longitudinal direction is more than or equal to 130 Mpa. According to the present invention, the tensile strength of the separation membrane can achieve more than or equal to 130 Mpa so as to meet requirements of most users; the separation membrane puncture strength achieves more than or equal to 300 gf, such that the piercing phenomenon during the battery assembly can be well avoided; the heat resistance is good, such that the separation membrane can work in the high temperature environment; the thermal shrinkage is low, such that the separation membrane can not produce the short circuit phenomenon caused by the high shrinkage during the use; and the permeability and the porosity are in the appropriate range so as to well meet the lithium-ion battery performance requirements.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragm production, and in particular relates to a three-layer co-extruded lithium-ion battery diaphragm and a production method thereof. Background technique [0002] With the continuous expansion of the application field of lithium batteries and the improvement of people's demand for lithium battery products, how to obtain lithium batteries with excellent performance has become a hot spot of concern. [0003] Lithium battery separator is one of the core components of lithium-ion batteries, and its cost accounts for about 20% to 30% of the cost of the entire lithium battery. Its performance has a very important impact on the overall performance of lithium batteries, and is one of the key technologies restricting the development of lithium batteries. [0004] The traditional lithium-ion battery separator production process is divided into two types: dry method and wet method. The po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/417H01M50/457H01M50/491
CPCH01M50/403H01M50/409Y02E60/10
Inventor 边红兵徐瑞璋李木肖正武王宜徐明
Owner HUIQIANG WUHAN NEW ENERGY MATERIAL TECH
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