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Gel polymer electrolyte and preparation method thereof

A technology of gel polymer and electrolyte, which is applied in the direction of hybrid capacitor electrolyte, hybrid/electric double layer capacitor manufacturing, etc., which can solve the problems of reduced stability of electric double layer capacitors

Inactive Publication Date: 2014-05-21
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

LiBF 4 It is the most commonly used lithium salt. However, tetrafluoroborate has strong hygroscopicity. During the electrochemical cycle, the water absorbed by tetrafluoroborate will participate in the motor reaction to generate acid. The acid will corrode the aluminum foil as the current collector, resulting in the use of LiBF 4 Decreased Stability of Electric Double Layer Capacitors Using PAN-Based Gel Polymer Electrolyte as Electrolyte

Method used

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  • Gel polymer electrolyte and preparation method thereof
  • Gel polymer electrolyte and preparation method thereof

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preparation example Construction

[0025] see figure 1 , the preparation method of above-mentioned gel polymer electrolyte, comprises the following steps:

[0026] Step S110, ultrasonically dispersing the alkyldiimine compound in the electrolytic solution to form a mixed solution, the electrolytic solution includes lithium tetrafluoroborate and a plasticizer, and the mass ratio of lithium tetrafluoroborate to the plasticizer is 1:7-1 :9, the plasticizer is formed by mixing ethylene carbonate and dimethyl carbonate, and the mass ratio of alkyldiimine compound to electrolyte is 1:850~1:14.

[0027] Preferably, the alkyldiimine compound is selected from one of N,N'-dicyclohexylcarbodiimide and N,N'-dicyclopentylcarbodiimide.

[0028] Preferably, the volume ratio of ethylene carbonate to dimethyl carbonate is 1:1˜1:3.

[0029] Preferably, the time for ultrasonic dispersion is 5 minutes to 30 minutes.

[0030] Step S120, immersing the polyacrylonitrile microporous membrane in the mixed solution to absorb the mixe...

Embodiment 1

[0036] In the glove box, ultrasonically disperse 0.5g N,N'-dicyclohexylcarbodiimide (ultrasonic 30min) in 8.5g lithium salt solution to form a mixed solution, wherein the lithium salt solution includes LiBF4 and plasticizer, LiBF4 and plasticizer The mass ratio of the plasticizer is 1:8, and the plasticizer is formed by mixing EC and DMC with a volume ratio of 1:2, and then immersing 1g of the dried PAN microporous membrane in the above mixed solution, and after 180min, the PAN microporous membrane will The mixed solution was completely absorbed to obtain the PAN-based gel polymer electrolyte added with N,N'-dicyclohexylcarbodiimide. In the obtained gel polymer electrolyte, the mass percentage of PAN matrix is ​​10%, the mass percentage of lithium salt and plasticizer is 85%, and the mass percentage of alkyldiimine compound is 5%.

Embodiment 2

[0038] In the glove box, ultrasonically disperse 0.4g N,N'-dicyclopentylcarbodiimide (ultrasonic 25min) in 8.4g lithium salt solution to form a mixed solution, wherein the lithium salt solution includes LiBF4 and plasticizer, LiBF4 and The mass ratio of the plasticizer is 1:9, and the plasticizer is formed by mixing EC and DMC at a volume ratio of 1:1, and then immersing 1.2g of the dried PAN microporous membrane in the above mixture, and taking it out after 150min , that is, a PAN-based gel polymer electrolyte added with N,N'-dicyclopentylcarbodiimide was obtained. In the obtained gel polymer electrolyte, the mass percentage of PAN matrix is ​​12%, the mass percentage of lithium salt and plasticizer is 84%, and the mass percentage of alkyldiimine compound is 4%.

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Abstract

The invention discloses a gel polymer electrolyte comprising polyacrylonitrile and an electrolytic solution and an alkyl-diimine compound which are absorbed into the polyacrylonitrile. In the gel polymer electrolyte, the mass percent of the polyacrylonitrile is in the range from 10% to 25%, the mass percent of the electrolytic solution in the range from 70% to 85%, and the mass percent of the alkyl-diimine compound in the range from 0.1% to 5%. The electrolytic solution comprises lithium tetrafluoroborate and a plasticizer, wherein the mass ratio of the lithium tetrafluoroborate to the plasticizer is in the range from 1:7 to 1:9, and the plasticizer is formed by mixing ethylene carbonate and dimethyl carbonate. The gel polymer electrolyte can be used to avoid the corrosion of an aluminum foil. The invention further provides a preparation method of the gel polymer electrolyte.

Description

technical field [0001] The invention relates to a gel polymer electrolyte and a preparation method thereof. Background technique [0002] Gel polymer electrolyte lithium-ion batteries have been valued by researchers because of their safety, no leakage, and low leakage current. Gel polymer electrolyte is a new type of functional polymer material, which can be used as a separator and electrolyte material at the same time, which can make the battery thinner, thereby improving the flexibility of battery design. [0003] The PAN system has the characteristics of simple synthesis, high electrochemical stability, non-flammability, etc., and is suitable as an electrolyte matrix material. LiBF 4 It is the most commonly used lithium salt. However, tetrafluoroborate has strong hygroscopicity. During the electrochemical cycle, the water absorbed by tetrafluoroborate will participate in the motor reaction to generate acid. The acid will corrode the aluminum foil as the current collecto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/56H01G11/84
Inventor 周明杰邓惠仁王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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