PVDF-P(VC-VAc)-based blended gel polymer electrolyte and preparation method and application thereof

A gel polymer and polymer blend technology, applied in the field of electrolytes, to achieve high discharge specific capacity and cycle stability, avoid liquid leakage, and high electrochemical stability.

Active Publication Date: 2016-08-03
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this research direction has not yet reached an ideal state

Method used

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  • PVDF-P(VC-VAc)-based blended gel polymer electrolyte and preparation method and application thereof
  • PVDF-P(VC-VAc)-based blended gel polymer electrolyte and preparation method and application thereof
  • PVDF-P(VC-VAc)-based blended gel polymer electrolyte and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 50g of a mixed solution of DMF (dimethylformamide) and DMC (dimethyl carbonate) in a beaker, where the mass ratio of DMF and DMC is 9:1, stir magnetically at 25°C for 10min, and mix well , to obtain a mixed solvent.

[0029] (2) PVDF (polyvinylidene fluoride) of 4.5g and P (VC-VAc) (vinyl chloride-vinyl acetate copolymer) of 0.5g are weighed and joined in the mixed solvent described in step (1), 60 ℃ magnetic stirring for 12h, that is, the film-forming solution.

[0030] (3) Coat the film-forming solution on a smooth glass plate, and then immerse in distilled water at 25° C. for 3 hours to form a film.

[0031] (4) Dry the film obtained in step (3) at 60° C. for 48 hours under vacuum condition.

[0032] (5) The thin film obtained after drying in step (4) was soaked in an electrolyte solution under an argon atmosphere to obtain a PVDF / P(VC-VAc)-based blended gel polymer electrolyte. The electrolyte composition is as follows: LiPF is used for lithium salt 6 ...

Embodiment 2

[0036] (1) Weigh 50g of a mixed solution of DMF (dimethylformamide) and DMC (dimethyl carbonate) in a beaker, where the mass ratio of DMF and DMC is 9:1, stir magnetically at 25°C for 10min, and mix well , to obtain a mixed solvent.

[0037] (2) PVDF (polyvinylidene fluoride) of 2.5g and P (VC-VAc) (vinyl chloride-vinyl acetate copolymer) of 2.5g by weighing join in the mixed solvent described in step (1), 60 ℃ magnetic stirring for 12h, that is, the film-forming solution.

[0038] (3) Coat the film-forming solution on a smooth glass plate, and then immerse in distilled water at 60° C. for 2 hours to form a film.

[0039] (4) Dry the film obtained in step (3) at 60° C. for 72 hours under vacuum condition.

[0040] (5) The thin film obtained after drying in step (4) was soaked in an electrolyte solution under an argon atmosphere to obtain a PVDF / P(VC-VAc)-based blended gel polymer electrolyte. The electrolyte composition is as follows: LiPF is used for lithium salt 6 , the ...

Embodiment 3

[0044](1) Weigh 50g of N-methylpyrrolidone (NMP) in a beaker, weigh 3.5g of PVDF and 1.5g of P(VC-VAc) into the above NMP, and stir magnetically at 50°C for 12h to obtain a film-forming solution .

[0045] (2) Coat the film-forming solution on a smooth glass plate, and then immerse in distilled water at 25° C. for 3 hours to form a film.

[0046] (3) Dry the film obtained in step (2) at 60° C. for 48 hours under vacuum condition.

[0047] (4) The thin film obtained after drying in step (3) was soaked in an electrolyte solution under an argon atmosphere to obtain a PVDF / P(VC-VAc)-based blended gel polymer electrolyte. The electrolyte composition is as follows: LiPF is used for lithium salt 6 , the concentration is 1mol / L, the organic solvent adopts ethylene carbonate (EC): ethyl methyl carbonate (EMC): dimethyl carbonate (DMC)=1:1:1 (mass ratio), and ethylene carbonate (EC) , Ethyl Methyl Carbonate (EMC), and Dimethyl Carbonate (DMC) are mixed uniformly according to their co...

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Abstract

The invention provides a PVDF-P(VC-VAc)-based blended gel polymer electrolyte and a preparation method and application thereof. The preparation method comprises the steps that PVDF (polyvinylidene fluoride) and P(VC-VAc) (chloroethylene- vinyl acetate copolymers) are jointly dissolved into an organic solvent, the materials are stirred to be uniform to obtain film forming liquid, the film forming liquid is applied to a smooth plane and then soaked in a non-solvent system for film forming, a film is dried, the dried film is soaked in an electrolyte solution to adsorb the electrolyte solution, and then the PVDF-P(VC-VAc)-based blended gel polymer electrolyte is obtained. The PVDF-P(VC-VAc)-based blended gel polymer electrolyte is in a gel state, therefore, the phenomenon that a lithium ion battery leaks liquid and catches a fire in the using process can be avoided, the safety performance is greatly improved compared with a traditional lithium ion battery, the high electrochemical stability is achieved, and the lithium ion battery prepared from the PVDF-P(VC-VAc)-based blended gel polymer electrolyte has the high specific discharge capacity and cycling stability.

Description

Technical field: [0001] The invention belongs to the field of electrolytes, and in particular relates to a PVDF / P(VC-VAc)-based blended gel polymer electrolyte for lithium ion batteries, a preparation method and application thereof. Background technique: [0002] Since its industrialization, lithium-ion batteries have rapidly occupied most of the market in the field of portable device energy by virtue of its unique advantages. In recent years, as environmental problems have become more and more prominent, people's calls for the application of clean and environmentally friendly energy have also increased. Therefore, in this case, it has become a development trend to develop a class of lithium-ion power supplies with high energy density and high power. [0003] However, the safety performance of lithium-ion batteries is still an urgent problem to be solved today. Existing commercial lithium-ion batteries use flammable and toxic liquid electrolytes. Under improper use conditi...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0565
CPCH01M10/0525H01M10/0565Y02E60/10
Inventor左晓希赵敏凯南俊民
OwnerSOUTH CHINA NORMAL UNIVERSITY