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Application of heat-resistant porous diaphragm to lithium ion battery

A technology of lithium-ion batteries and porous diaphragms, which is applied to battery components, circuits, electrical components, etc., can solve the problems of battery micro-short circuit, large diaphragm pore size, self-discharge, etc., and achieve improved adsorption rate, high porosity, and easy Magnified effect

Active Publication Date: 2016-02-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 heat-resistant porous diaphragm to lithium ion battery
  • Application of heat-resistant porous diaphragm to lithium ion battery
  • Application of heat-resistant porous diaphragm to lithium ion battery

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 application of a heat-resistant porous diaphragm to a lithium ion battery. The porous diaphragm is prepared from one or more than two of heat-resistant high-molecular polymers such as polysulfone, polyketone, polyimide, polybenzimidazole and polyetherimide; the pore diameter of the porous diaphragm is 5-500 nm, and the porosity rate is 30-70%. The porous diaphragm is high in porosity rate, the pore structure of porous diaphragm is easy to regulate, and obtained pores have a certain degree of curvature, so that when the porous diaphragm is applied to the lithium ion battery, micro short circuit and self-discharge phenomena can be effectively avoided, and meanwhile, higher electrolyte affinity and cycling stability are realized. A preparation method for the diaphragm is simple, environment-friendly, and easy to popularize; the porous diaphragm has a relatively good application prospect 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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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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