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Separator for lithium battery and preparation method thereof

A lithium battery and diaphragm technology, applied in the field of lithium battery diaphragm and its preparation, can solve the problems of lithium ion battery performance degradation, poor electrolyte wettability, poor thermal stability, etc., and achieve excellent thermal stability and mechanical properties, excellent mechanical properties Excellent performance and heat resistance

Active Publication Date: 2020-11-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the most important commercial film currently used in the market is polyolefin separator, because polyolefin separator has the advantages of resistance to electrolyte corrosion, non-toxicity, good strength, and low cost, but the disadvantages of polyolefin separator are also obvious, such as low melting point , poor thermal stability, low porosity, poor electrolyte wettability, these will directly cause the performance of lithium-ion batteries to decline, and there are certain safety hazards

Method used

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  • Separator for lithium battery and preparation method thereof
  • Separator for lithium battery and preparation method thereof
  • Separator for lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Weigh 7g Kevlar 49 and 7g KOH and add them to 500ml DMSO, seal them with sealant and stir magnetically at room temperature for about a week to obtain a dark red ANF suspension; during the experiment, it was found that the aramid fiber was dissolved During the process, the system presents different states at different time periods, the aramid fiber gradually dissolves, the color of the system gradually deepens, and finally turns dark red, and the ANF suspension is obtained;

[0044] (2) Centrifuge the ANF suspension in step (1) at a speed of 8000 rad / min and a temperature of 25°C for 45 min to remove undissolved KOH and aramid fibers in the suspension, and prepare a concentration of 2.159 wt%. ANF / DMSO solution; figure 1 It is the transmission electron microscope picture of the ANF / DMSO solution obtained in Example 1. In the figure, the existence of nanofibers in the ANF solution can be clearly observed, and a relatively good structural shape is maintained; it shows ...

Embodiment 2

[0049] (1) Weigh 8g Kevlar 49 and 10g KOH respectively and add to 500ml DMSO, seal with sealant and stir magnetically at room temperature for about a week to obtain dark red ANF suspension.

[0050] (2) Centrifuge the ANF suspension in step (1) at a speed of 8000 rad / min and a temperature of 22° C. for 45 min to remove undissolved KOH and aramid fibers in the suspension to prepare 2.365 wt % concentration of ANF ANF / DMSO solution.

[0051] (3) Dilute the ANF solution of the 2.365wt% concentration obtained in step (2) to a 1.5wt% concentration, then add the PEO of 1,000,000 molecular weights with the same quality as ANF, that is, the para-aramid fiber: the mass ratio of PEO is 1 : 1. After being heated and mechanically stirred in a water bath at 50°C, a uniformly mixed spinning solution is obtained.

[0052] (4) Take an appropriate amount of the spinning solution of step (3) with a 5ml diameter syringe of 12.5mm, and use a needle with an inner diameter of 0.2mm and an outer di...

Embodiment 3

[0057] (1) Weigh 8g Kevlar 49 and 10g KOH respectively and add to 500ml DMSO, seal with sealant and stir magnetically at room temperature for about a week to obtain dark red ANF suspension.

[0058] (2) Centrifuge the ANF suspension in step (1) at a speed of 8000 rad / min and a temperature of 22° C. for 45 min to remove undissolved KOH and aramid fibers in the suspension to prepare 2.365 wt % concentration of ANF ANF / DMSO solution.

[0059] (3) Dilute the ANF solution of the 2.365wt% concentration obtained in step (2) to a 1.5wt% concentration, then add the PEO of 1,000,000 molecular weights with the same quality as ANF, that is, the para-aramid fiber: the mass ratio of PEO is 1 : 1. After being heated and mechanically stirred in a water bath at 50°C, a uniformly mixed spinning solution is obtained.

[0060] (4) Take an appropriate amount of the spinning solution of step (3) with a 5ml diameter syringe of 12.5mm, and use a needle with an inner diameter of 0.2mm and an outer di...

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Abstract

The invention relates to a separator for lithium batteries and a preparation method thereof, belonging to the field of battery separators. The invention provides a separator for a lithium battery, which is a para-aramid nanofiber membrane, which is prepared by the following preparation method: first, a spinning aid is added to a para-aramid fiber solution to obtain a uniform spinning solution, and then the resulting spinning solution is made of para-aramid nanofiber membrane by electrospinning; wherein, the spinning aid is polyethylene oxide, polyvinylpyrrolidone or polyvinyl alcohol In one, the mass ratio of the spinning aid to the para-aramid fiber in the para-aramid fiber solution is: 10 parts by weight of the para-aramid fiber and 1-12 parts by weight of the spinning aid. The separator for lithium batteries obtained by the invention has excellent thermal stability and mechanical properties; on the premise of excellent electrochemical properties, the safety of lithium batteries is greatly improved.

Description

technical field [0001] The invention relates to a separator for lithium batteries and a preparation method thereof, belonging to the field of battery separators. Background technique [0002] In recent years, with the increasingly serious energy crisis and environmental pollution, the development of new energy industries has become increasingly important. Lithium-ion batteries are an important part of the new energy industry and are the focus of research by researchers. Lithium-ion battery separator is an essential part of lithium-ion batteries, it will directly or indirectly affect the battery capacity, cycle performance and battery performance of lithium-ion batteries. [0003] The lithium-ion battery separator is an important part of the lithium-ion battery, located between the positive and negative electrodes of the lithium-ion battery. Lithium-ion batteries have a microporous structure that allows lithium ions to pass through freely while preventing electrons from pas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/40H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 傅强汤伟傅思睿陈枫
Owner SICHUAN UNIV
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