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Composite porous membrane material filled with cross-linked polystyrene microspheres and its preparation method and application

A technology for cross-linking polystyrene and membrane materials, applied in the field of porous membrane materials and composite porous membrane materials, can solve the problems of low charge retention rate, high porosity, and micro-short circuit of batteries

Active Publication Date: 2016-08-31
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this electrospun nanofiber separator is a non-woven fabric stacked by fibers, it has too high porosity and too large surface pore size, resulting in a low charge retention rate of the battery and frequent micro-short circuits. Especially when the thickness of the battery separator is low, such as below 30 microns, the probability of this situation is quite high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A composite porous membrane material filled with CPS-NP, which uses electrospun polyimide (PI) nanofiber nonwoven fabric as a base material, and the pores of the base material are filled with CPS-NP;

[0034] Its preparation method is as follows:

[0035] 1) Preparation of cross-linked polystyrene microspheres:

[0036] (1) Preparation of pre-emulsion

[0037] Accurately weigh 5.00g of anionic surfactant (model NPES-458), 1.10g of ammonium persulfate (APS), 100.00g of water, 70.00g of styrene (St), 10.00g of monobutyl itaconate (MBA) and 16.00 g of divinylbenzene (DVB) was mixed in a 500 ml beaker, and emulsified at room temperature with an emulsifier at a high speed of 10,000 rpm for 5 min to obtain about 202.10 g of a pre-emulsion.

[0038] (2) Preparation of cross-linked polystyrene nanosphere emulsion

[0039] Weigh 40.00g of the above pre-emulsion, 1.50g of dodecyl mercaptan and 56.00g of water into a four-neck bottle equipped with a stirrer and a reflux condenser...

Embodiment 2

[0044] A composite porous membrane material filled with CPS-NP, which is based on electrospun polyimide (PI) nanofiber nonwoven fabric, and the pores of the substrate are filled with CPS-NP;

[0045] Its preparation method is as follows:

[0046] 1) Preparation of cross-linked polystyrene microspheres (CPSMP):

[0047] (1) Preparation of pre-emulsion

[0048] Accurately weigh 6.0g of anionic surfactant (model NPES-458), 1.1g of ammonium persulfate (APS), 180.0g of water, 70.0g of styrene (St), 12.0g of monobutyl itaconate (MBA) and 16.0g of divinylbenzene (DVB) was mixed in a 500ml beaker, and emulsified at room temperature with an emulsifier at a high speed of 10000rpm for 5min to obtain about 285.1g of the pre-emulsion.

[0049] (2) Preparation of cross-linked polystyrene nanosphere emulsion

[0050] Weigh 60.00g of the above pre-emulsion, 1.50g of dodecyl mercaptan and 69.00g of water into a four-necked bottle equipped with a stirrer and a reflux condenser as a seed emul...

Embodiment 3

[0055] A composite porous membrane material filled with CPS-NP, which is based on electrospun polyimide (PI) nanofiber nonwoven fabric, and the pores of the substrate are filled with CPS-NP;

[0056] Its preparation method is as follows:

[0057] 1) Preparation of cross-linked polystyrene microspheres (CPSMP):

[0058] (1) Preparation of pre-emulsion

[0059] Accurately weigh 8.0g of anionic surfactant (model NPES-458), 1.1g of ammonium persulfate (APS), 180.0g of water, 70.0g of styrene (St), 14.0g of monobutyl itaconate (MBA) and 18.0g of divinylbenzene (DVB) was mixed in a 500ml beaker, and emulsified at room temperature with an emulsifier at a high speed of 10000rpm for 5min to obtain about 291.1g of pre-emulsion.

[0060] (2) Preparation of cross-linked polystyrene nanosphere emulsion

[0061] Weigh 60.00g of the above pre-emulsion, 1.50g of dodecyl mercaptan and 82.8g of water into a four-necked bottle equipped with a stirrer and a reflux condenser as the seed emulsio...

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Abstract

The invention discloses a CPS-NP filled composite multi-curvature membrane material, which uses polyimide (PI) nanofiber non-woven fabric as the base material, and the pores of the base material are filled with cross-linked polystyrene nano-microspheres. (CPS-NP); the CPS-NP has a diameter between 50-200nm and a melting temperature higher than 300°C, accounting for 20-60% of the total weight of the nanocomposite multi-curved membrane material; the PI nano Fiber nonwovens are electrospun PI nanofiber nonwovens with a thickness between 9-38μm, a porosity between 60-80%, and a fiber diameter below 0.5μm. The nanocomposite multi-curvature membrane material provided by the invention is resistant to high temperature, heat shrinkage, high voltage and high current impact, and mechanical impact resistance, and is suitable for use as a safety battery separator and a safety supercapacitor separator to manufacture various high-capacity and high-voltage Power lithium battery or supercapacitor. The invention also provides a preparation method of the nanocomposite multi-curvature membrane material and its application as a battery separator.

Description

technical field [0001] The invention belongs to the field of battery separators and relates to a porous membrane material, in particular to a composite porous membrane material containing CPS-NP, a preparation method thereof and an application as a battery separator. Background technique [0002] As the power battery of new energy vehicles, lithium-ion batteries have been developed rapidly and will become an indispensable daily necessities for human beings. However, since the currently used lithium battery separator is a polyolefin porous membrane material with poor temperature resistance, at a higher temperature, or in the case of overcharging, overdischarging and mechanical damage, lithium-ion batteries are prone to smoke, Fire, even explosion and other hidden dangers that endanger the safety of users. Therefore, improving the safety of lithium-ion batteries is the key to promoting the application of lithium-ion batteries in automotive power and other fields. [0003] Fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01G11/52H01G11/84H01M50/414H01M50/491
CPCH01G11/52H01G11/84H01M2220/20H01M50/411H01M50/44H01M50/403Y02E60/13Y02E60/10
Inventor 侯豪情李春根周刚勇熊天柔冯艳朱丽周松智
Owner JIANGXI NORMAL UNIV