Application of a heat-resistant porous separator in lithium-ion batteries

A lithium-ion battery, porous diaphragm technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of large diaphragm pore size, battery micro-short circuit, self-discharge, etc., to improve adsorption rate, improve safety, porosity high rate effect

Active Publication Date: 2017-12-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore size of this type of separator is relatively large, and most of them are straight through holes, which can easily lead to micro-short circuit, self-discharge and liquid leakage in the battery.

Method used

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  • Application of a heat-resistant porous separator in lithium-ion batteries
  • Application of a heat-resistant porous separator in lithium-ion batteries
  • Application of a heat-resistant porous separator in lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 10 g of polyetherimide was dissolved in 40 ml of nitrogen methylpyrrolidone to form a polymer solution. Spread the solution on a glass plate (scratch thickness 80um), and then put the glass plate in a constant temperature and humidity box with a temperature of 50° C. and a humidity of 100% for 5 minutes to obtain a porous diaphragm. The cross-sectional structure of the film was analyzed by scanning electron microscopy ( figure 1 ), the membrane cross-section is a highly symmetrical sponge-like structure. Lithium-ion coin cells were assembled for testing, wherein the assembly of the lithium-ion coin cells was carried out in an argon-filled glove box. Using LiFePO4 as the positive electrode material and lithium sheet as the negative electrode, the TC-E269 electrolyte provided by Guangzhou Tinci and the prepared separator were used to assemble a half-cell for testing. The cycle test is carried out between 2.5-4.2V, and the battery is charged and discharged at a rate of ...

Embodiment 2

[0034] Others are the same as embodiment 1, polyetherimide is changed into polyimide.

Embodiment 3

[0036] Others are the same as in Example 1, except that polyetherimide is changed to polyethersulfone.

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Abstract

The invention relates to the application of a heat-resistant porous diaphragm in a lithium ion battery. The porous diaphragm is made of one or more of polysulfone, polyketone, polyimide, polybenzimidazole, and polyetherimide. It is prepared from more than two kinds of heat-resistant high molecular polymers; the pore size of the porous diaphragm is 5-500nm, and the porosity is 30-70%. This kind of porous separator has high porosity, easy control of pore structure, and the obtained pores have a certain curvature. It can effectively avoid the occurrence of micro-short circuit and self-discharge when used in lithium-ion batteries, and has higher electrophilicity and cycle stability. . The method is simple, environmentally friendly and easy to scale up, and has good application prospects in the field of lithium-ion batteries.

Description

technical field [0001] The invention relates to the application of a porous diaphragm in lithium ion batteries, in particular to the application of a heat-resistant porous diaphragm in lithium ion batteries. Background technique [0002] In recent years, as a high specific energy power source, lithium-ion batteries have been widely used in portable electronic devices, electric tools, electric vehicles, energy storage power stations and other fields. [0003] The separator in the lithium-ion battery mainly plays the role of blocking the positive and negative electrodes to prevent the short circuit of the battery, and conducting the lithium ions to form a battery circuit. Therefore, the diaphragm material is required to have good electrical insulation and maintain chemical stability in a wide temperature and voltage range. For a porous diaphragm material that can be used in practice, the following requirements must be met: suitable pore size, high porosity to ensure sufficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/18H01M50/403H01M50/463H01M50/491
CPCY02E60/10
Inventor 李先锋张华民段寅琦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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