Gel polymer electrolyte for lithium ion battery, and preparation method thereof

A gel polymer and electrolyte technology, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems that the research results have not yet reached, and achieve high electrochemical stability, good thermal shrinkage resistance, and high electrical conductivity rate effect

Inactive Publication Date: 2015-12-02
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the directions is to use gel polymer electrolyte to replace the traditional separator and liquid electrolyte system, but the research results in this direction have not yet reached an ideal level

Method used

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  • Gel polymer electrolyte for lithium ion battery, and preparation method thereof
  • Gel polymer electrolyte for lithium ion battery, and preparation method thereof
  • Gel polymer electrolyte for lithium ion battery, and preparation method thereof

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preparation example Construction

[0045] Correspondingly, the preparation method of the gel polymer electrolyte includes the following steps:

[0046] The polyvinylidene fluoride and cellulose acetate butyrate are co-dissolved in the solvent to form liquid 1, and then the carbomer resin is added to liquid 1 and fully stirred to form liquid 2. Finally, the polyolefin microporous membrane is immersed in liquid 2. The polymer film formed after drying is immersed in the electrolyte and taken out.

[0047] Preferably, the solvent is at least one of DMF, NMP and DMC.

[0048] Preferably, the mass ratio of polyvinylidene fluoride and cellulose acetate butyrate is (1-4): 1, and the sum of the mass of polyvinylidene fluoride and cellulose acetate butyrate accounts for 3% to 10% of the mass of liquid 1.

[0049] Preferably, the mass of the carbomer resin accounts for 0.01% to 0.2% of the total mass of the liquid 2;

[0050] Preferably, the polyolefin microporous film is immersed in the liquid 2 for 0.5h to 1h, the dry...

Embodiment 1

[0057] (1) Weigh 63g of DMF and 27g of DMC in a beaker, stir magnetically at 25°C for 30min, and mix well.

[0058] (2) Weigh 6.6 g of PVdF and 3.3 g of CAB into the mixed solvent of step (1), and stir magnetically at 25° C. for 6 h.

[0059] (3) Weigh 0.2 g of carbomer resin into the liquid obtained in step (2), and stir magnetically at 25° C. for 1 h.

[0060] (4) The polypropylene microporous membrane is immersed in the liquid obtained in step (3), taken out after 0.5 h, air-dried at room temperature, and then transferred to a vacuum drying oven for drying at 60° C. for 24 h to obtain a polymer membrane.

[0061](5) The polymer film obtained in step (4) is sliced, and the obtained round polymer film is immersed in an electrolyte solution for 1 hour under an argon atmosphere to prepare a gel polymer electrolyte. The electrolyte solvent adopts EC:DMC:DEC=1:1:1, and the lithium salt adopts LiPF 6 , the concentration is 1mol / L;

[0062] (6) The gel polymer electrolyte obtain...

Embodiment 2

[0064] (1) Weigh 90 g of NMP into a beaker.

[0065] (2) Weigh 6.6 g of PVdF and 3.3 g of CAB into the NMP described in step (1), and stir magnetically at 25° C. for 24 h.

[0066] (3) Weigh 0.01 g of carbomer resin into the liquid obtained in step (2), and stir magnetically at 25° C. for 1 h.

[0067] (4) The polypropylene microporous membrane is immersed in the liquid obtained in step (3), taken out after 0.5 h, air-dried at room temperature, and then transferred to a vacuum drying oven for drying at 60° C. for 24 h to obtain a polymer membrane.

[0068] (5) The polymer film obtained in step (4) is sliced ​​with a microtome, and the obtained round polymer film is immersed in an electrolyte solution for 1 hour under an argon atmosphere to prepare a gel polymer electrolyte. The electrolyte solvent adopts EC:DMC:DEC=1:1:1, and the lithium salt adopts LiPF 6 , the concentration is 1mol / L.

[0069] (6) The gel polymer electrolyte obtained in step (5) is assembled into a button...

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Abstract

The invention discloses a gel polymer electrolyte for a lithium ion battery, and a preparation method thereof. The gel polymer electrode is composed of a polymer film as a substrate, and an electrolyte adsorbed to the polymer film; and the polymer film is made through the following steps: co-dissolving Carbomer resin, polyvinylidene fluoride and cellulose acetate butyrate in a solvent, mechanically stirring to form a liquid, coating the liquid, and solidifying the coated liquid on a polyolefin micro-porous film. The preparation method of the gel polymer electrolyte comprises the following steps: co-dissolving polyvinylidene fluoride and cellulose acetate butyrate in the solvent to prepare a liquid 1, adding the Carbomer resin to the liquid, fully stirring to form a liquid 2, immersing the polyolefin micro-porous film in the liquid 2, drying, immersing the dried polymer film in the electrolyte, and taking out the immersed film. The polymer lithium ion battery comprises the gel polymer electrolyte, a positive electrode and a negative electrode. The gel polymer electrolyte has the advantages of thermal contraction resistance, high conductivity and high electrochemical stability.

Description

technical field [0001] The invention relates to a gel polymer electrolyte for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries were industrialized in the early 1990s. They are widely used in portable devices and have been widely used in automobiles in recent years. With the rapid development of technology, people are more and more eager for high capacity and high power. At the same time, it is also hoped that the safety performance of lithium-ion batteries will be improved. [0003] In real life, news about the explosion of lithium-ion batteries emerges in an endless stream, such as the Apple mobile phone that has repeatedly reported battery explosion news, so that everyone has concerns when choosing an Apple mobile phone. [0004] In order to improve the capacity of lithium-ion batteries and enhance their safety performance, a large number of scientific research institutions and enterprises have invested a lot of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 左晓希赵敏凯南俊民
Owner SOUTH CHINA NORMAL UNIVERSITY
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