Modified polyimide nanofiber membrane as well as preparation and application thereof

A nanofiber membrane, polyimide technology, applied in fiber processing, textiles and papermaking, non-woven fabrics, etc., can solve the problems of difficult to control porosity uniformity, direct contact between positive and negative electrodes, insufficient heat resistance, etc. Achieve the effect of reducing performance defects, low interface contact resistance, and good consistency

Pending Publication Date: 2019-05-17
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the porous membrane has disadvantages such as easy leakage of electrolyte, insufficient heat resistance, low porosity and difficulty in controlling the uniformity of porosity. When collision, overcharging or other factors lead to thermal runaway of the battery, the separator will shrink or melt. , resulting in direct contact between the positive and negative electrodes, causing the battery to short-circuit, and in severe cases, it will cause accidents such as battery fire.

Method used

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  • Modified polyimide nanofiber membrane as well as preparation and application thereof
  • Modified polyimide nanofiber membrane as well as preparation and application thereof
  • Modified polyimide nanofiber membrane as well as preparation and application thereof

Examples

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preparation example Construction

[0039] 1. Preparation of modified polyimide.

[0040] S01, preparation of dinitro compounds: 6.606g hydroquinone, 19.349g anhydrous potassium carbonate, 27.517g 2-chloro-5 nitrobenzotrifluoride were dissolved in 200mL N, N-dimethylformamide, in After stirring and mixing in an oil bath at 130°C for 20 h, the mixed solution was transferred to 300 mL of deionized water, and 10 mL of hydrogen chloride solution with a mass fraction of 37% was added dropwise, then filtered, washed with deionized water, and dried to obtain a white dinitro compound.

[0041] S02, amination of dinitro compounds: add 7.325g of dinitro compounds to 150mL of ethanol and hydrazine hydrate mixed solution (hydrazine hydrate in the mixed solution is 15mL), then add 0.201g of Raney nickel catalyst, condense and reflux at 105°C React for 5h, then filter and recrystallize to obtain a light yellow modified polyimide intermediate.

[0042] S03, preparation of modified polyimide: Dissolve 4.283g of modified polyim...

Embodiment 1

[0045] Step 1: Preparation of spinning solution: disperse 0.025g of sulfonated graphene oxide in 15mL of N,N-dimethylacetamide by ultrasonic dispersion to obtain dispersion A, and the ultrasonic conditions are ultrasonic power 200W, ultrasonic 12min; Dissolve 4.211g of modified polyimide in 35mL N,N-dimethylacetamide to obtain solution B, then mix dispersion A and solution B uniformly to obtain the spinning solution;

[0046] Step 2: Preparation of nanofiber membrane: Electrospinning the spinning solution to prepare a composite membrane, and drying at 150° C. for 2 hours. The electrospinning conditions were as follows: the diameter of the needle was 0.51 mm, the temperature was 10 °C, the humidity was 40% rh, the spinning voltage was 15 kV, and the flow rate of the spinning solution was 0.5 mL / h. Then the dried composite membrane was heat-treated at 300°C for 15s to obtain the nanofiber membrane.

[0047] In this embodiment, the average particle size of the sulfonated graphen...

Embodiment 2

[0050] Compared with Example 1, the difference of this example is that the addition amount of sulfonated graphene oxide is 0.042g, the addition amount of modified polyimide is 3.121g, and other parts are the same as Example 1.

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Abstract

The invention discloses a modified polyimide nanofiber membrane. The nanofiber membrane is prepared from a solution containing the following raw materials in percentage by mass: 0.01%-0.5% of sulfonated graphene oxide, 5%-20% of modified polyimide and the balance of an organic solvent by spinning. The nanofiber membrane has higher porosity and uniform pore size distribution, and has good high-temperature stability and electrochemical stability. On the other hand, the nanofiber membrane has good liquid absorption and wettability and can fully contact with an electrolyte; besides, the nanofibermembrane has the characteristics of high ionic conductivity and low interface contact resistance, so that the nanofiber membrane can be used as a separator in preparation of a lithium ion battery, cycle performance of the lithium ion battery is improved, and use safety of the battery is effectively improved.

Description

technical field [0001] The invention belongs to the field of nanofiber membrane preparation, and in particular relates to a modified polyimide nanofiber membrane and its preparation and application. Background technique [0002] In recent years, the global production of electric vehicles has grown rapidly. McKinsey's research report shows that China is accelerating the pace of electric vehicles. The report said that in 2017, the global production of electric vehicles was 870,000, and China's electric vehicle production accounted for 43%. %, as the core power component of electric vehicles, the power battery industry has become a sunrise industry that has attracted much attention. Since 2012, the technology of electric vehicle products has continuously broken through and matured, and the charging speed, battery life, and power output of electric vehicles have been greatly improved. However, safety accidents frequently occur during the use of electric vehicles. In the first h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4334D04H1/728D01D5/00C08G73/10
Inventor 黎中利王蓉陈松王小龙
Owner SHENZHEN BAK POWER BATTERY CO LTD
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