High-temperature-resistant lithium battery diaphragm and production method thereof

A technology for lithium battery separators and production methods, which is applied to battery components, circuits, electrical components, etc., to achieve the effects of good heat resistance, flame retardancy and self-extinguishing ability

Inactive Publication Date: 2014-07-16
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PET separator prepared by the nuclear track etching membrane method has the characteristics of uniform micropore distribution, high liquid-hanging ability, easy etching, and higher heat resistance than PP and PE membranes. However, in some lithium batteries that need to be charged with a large current In the case of discharge, the base material still cannot meet the demand
[0006] At present, the commonly used substrates of the nuclear track etching film method are PET and PC, and there is no report on the combination of polyimide substrate with good heat resistance and the nuclear track etching film method in the existing public literature.

Method used

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  • High-temperature-resistant lithium battery diaphragm and production method thereof

Examples

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Effect test

Embodiment 1

[0036] A high temperature resistant lithium battery separator, its cross-sectional schematic diagram, as figure 1 As shown, the substrate of the diaphragm is a polyimide film 1 with a thickness of 5 μm, and micropores 2 are uniformly distributed on the substrate, and the micropores 2 are perpendicular to the surface of the polyimide film 1, and the pore density is 1×10 7 cm -2 , with a pore size of 0.2 μm.

[0037] Through the verification of the heat resistance of the lithium battery separator, it is known that the lithium battery separator can be used for a long time at 230°C, has flame retardancy and self-extinguishing ability, will not melt at high temperatures, and can only be used at a high temperature of 800°C It is coked and insoluble in any known organic solvents.

[0038] The high-temperature-resistant lithium battery separator is used to prepare lithium battery samples, which can withstand 2C charge and discharge, and when the sample battery is charged and dischar...

Embodiment 2

[0040] The difference from Example 1 is that the polyimide diaphragm substrate is a polyimide film with a thickness of 15 μm, micropores are evenly distributed on the substrate, and the micropores are perpendicular to the surface of the polyimide film. 1×10 8 cm -2 , with a pore size of 1 μm.

Embodiment 3

[0042] The difference from Example 1 is that the polyimide diaphragm substrate is a polyimide film with a thickness of 35 μm, micropores are evenly distributed on the substrate, and the micropores are perpendicular to the surface of the polyimide film. 1×10 9 cm -2 , with a pore size of 3.0 μm.

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Abstract

The invention belongs to the technical field of battery diaphragms, and discloses a high-temperature-resistant lithium battery diaphragm and a production method thereof. A base material of the high-temperature-resistant diaphragm is a polyimide thin film, and micropores are uniformly formed in the base material. The production method comprises the steps of irradiating the polyimide thin film by heavy ions, and etching the irradiated polyimide thin film through a sodium hypochlorite solution. The high-temperature-resistant lithium battery diaphragm and the production method thereof have the advantages that the heat resistance is high, the tensile strength is high, environment pollution is avoided, the micropores are uniformly distributed, and high-current quick charging and discharging requirements for a lithium battery are met.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and in particular relates to a high-temperature-resistant lithium battery diaphragm and a production method thereof. Background technique [0002] Lithium battery separator is an electrically insulating film with a porous structure. It is an important part of lithium batteries. Its main function is to block the positive and negative plates and prevent the internal short circuit of the battery. However, it must have pores so that lithium ions can be quickly transported between the positive and negative electrodes during the electrochemical charge and discharge process. [0003] The traditional diaphragm production methods mainly include dry method and wet method. The commonly used materials for these two methods are polyolefin films polypropylene (PP) and polyethylene (PE). The dry method, that is, the melt stretching method, is to heat the polyolefin film to a certain temperature, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M50/403H01M50/417H01M50/463
CPCH01M50/403H01M50/411Y02E60/10
Inventor 吴振东梁海英焦学胜刘永辉鞠薇傅元勇陈东风
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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