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Gel electrolyte film for secondary battery as well as preparation and application of gel electrolyte film

A gel electrolyte and secondary battery technology, applied in secondary batteries, electrolyte immobilization/gelation, circuits, etc., can solve the problems of reducing chain segment mobility, mechanical strength, poor structural stability and thermal stability, and reducing condensation Gel electrolyte ionic conductivity and other issues, to achieve the effect of weakening the induction, easy to promote, good cycle stability and rate performance

Active Publication Date: 2020-04-28
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the single-component gel polymer electrolyte is regular, and it is easy to crystallize to reduce the mobility of the chain segment, thereby reducing the ionic conductivity of the gel electrolyte. At the same time, there are some problems in the interface contact with the electrode, and dendrites are easily generated in the metal electrode. Growth, poor mechanical strength, structural stability and thermal stability

Method used

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  • Gel electrolyte film for secondary battery as well as preparation and application of gel electrolyte film
  • Gel electrolyte film for secondary battery as well as preparation and application of gel electrolyte film
  • Gel electrolyte film for secondary battery as well as preparation and application of gel electrolyte film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Dissolve 2g PVDF-HFP in 21g acetone, heat to 60℃ and stir for 1h, fully dissolve, and obtain PVDF-HFP solution;

[0042] (2) Add 1g of PEG-4000 to the PVDF-HFP solution prepared in step (1), and stir at 60°C for 1 hour to obtain a PHP solution;

[0043] (3) Add 0.2g Ti 3 C 2 Type MXene powder was dissolved in 2 mL of absolute ethanol, stirred for 12 hours, and ultrasonically dispersed for 2 hours to obtain MXene ethanol solution; add 0.8 mL of MXene ethanol solution to the PHP solution in step (2), and stir at 60°C for 1 hour to obtain PHPM Solution

[0044] (4) Using solution casting technology, take 10mL of PHPM solution and 10mL of PVDF-HPF solution prepared in step (1) and cast them in a polytetrafluoroethylene mold. After standing in the air for 30 minutes, the film is formed, and then transferred to a vacuum oven After drying at 60°C for 12 hours, the gel electrolyte film and PVDF-HFP film were obtained accordingly.

[0045] From figure 1 It can be seen that the PVDF...

Embodiment 2

[0052] (1) Dissolve 2g PVDF-HFP in 21g acetone, heat to 60℃ and stir for 1h, fully dissolve, and obtain PVDF-HFP solution;

[0053] (2) Add 1g of PEG-4000 to the PVDF-HFP solution prepared in step (1), and stir at 60°C for 1 hour to obtain a PHP solution;

[0054] (3) Add 0.2g Ti 3 C 2 Type MXene powder was dissolved in 2 mL of absolute ethanol, stirred for 12 hours, and ultrasonically dispersed for 2 hours to obtain MXene ethanol solution; add 0.4 mL of MXene ethanol solution to the PHP solution in step (2) and stir at 60°C for 1 hour to obtain PHPM Solution

[0055] (4) Using solution casting technology, take 10 mL of PHPM solution and cast it in a polytetrafluoroethylene mold. After standing in the air for 30 minutes to form a film, it is transferred to a vacuum oven and dried at 60°C for 12 hours to obtain a gel electrolyte film. .

[0056] The SEM characterization shows that the prepared gel electrolyte film has obvious pore structure, and the thickness of the gel electrolyte fi...

Embodiment 3

[0063] On the basis of Example 2, the volume of the MXene ethanol solution in step (3) was modified from 0.4 mL to 0.6 mL, and the other steps and conditions were unchanged to obtain a gel electrolyte membrane.

[0064] SEM characterization shows that the prepared gel electrolyte film has obvious pore structure, and the thickness of the gel electrolyte film is 98 μm.

[0065] The thermal performance test of the prepared gel electrolyte film shows that its thermal decomposition temperature is above 350°C, and it has good thermal stability.

[0066] The gel electrolyte membrane prepared in this example was used to assemble a sodium-gel electrolyte-sodium symmetrical battery at 0.1mA / cm 2 The polarization test is carried out at a current density of 0.5%. The test results show that after 1200 hours of sodium deposition / stripping, the polarization voltage is below 75mV, indicating that the prepared gel electrolyte film can inhibit the growth of sodium metal dendrites.

[0067] The gel elec...

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Abstract

The invention relates to a gel electrolyte film for a secondary battery as well as preparation and application of the gel electrolyte film, and belongs to the technical field of gel polymer electrolytes. The gel electrolyte film disclosed by the invention is a film formed by connecting polyvinylidene fluoride-hexafluoropropylene, polyethylene glycol and MXene through hydrogen bonds; the gel electrolyte film has a function of inhibiting dendritic crystal growth of a metal negative electrode and good thermal stability, has high conductivity and a relatively wide electrochemical window after adsorbing an electrolyte of a secondary battery, and has good cycling stability and rate capability when being applied to the secondary battery as a gel electrolyte; in addition, the gel electrolyte filmis prepared by adopting a solution casting method, and is simple to operate, mild in condition and easy to popularize.

Description

Technical field [0001] The invention relates to a gel electrolyte film for a secondary battery, its preparation and application, and belongs to the technical field of gel polymer electrolytes. Background technique [0002] In recent years, with the rapid emergence of various smart devices and electric vehicles, energy storage systems have attracted more and more attention. Lithium-ion batteries have become the main power source equipment in the electric vehicles and portable electronics markets. However, the reserves of lithium resources on the earth are limited. With the consumption of lithium resources and the gradual increase in prices, it has become a necessary trend to find a next-generation energy storage system. Based on a wide range of applicability and economy, sodium ion batteries are considered to be an ideal substitute for lithium ion batteries in the future. [0003] As an important part of sodium-ion batteries, the performance of electrolyte materials directly affec...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08L71/02C08K3/14C08J5/18H01M10/0565H01M10/054
CPCC08J5/18C08J2327/16C08J2471/02C08K3/14H01M10/054H01M10/0565H01M2300/0085Y02E60/10
Inventor 谢嫚吴锋夏信德罗熳李成李帅杰王紫恒蒋文全
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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