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

A technology of lithium-ion batteries and gel polymers, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of difficult industrial production of lithium ions, improvement of electrochemical performance, low ion conductivity, etc., and achieve optimal liquid absorption The effects of improved performance and liquid retention, improved electrochemical performance, and simple preparation process

Active Publication Date: 2011-05-11
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some defects in the above-mentioned matrix: (1) the conductivity at room temperature is low, and there is still a certain gap from the level of liquid electrolyte; (2) the mechanical strength needs to be further improved in order to meet the needs of industrialization
The ionic conductivity of these two disclosed patents (applications) is on the low side, just reaching 10 -3 S cm -1 , it is difficult to apply to the industrial production of lithium ions, and other electrochemical properties need to be further improved

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) Under an inert gas atmosphere, the PEO and PVDF-HFP blends with a mass ratio of 1:1 were dissolved in acetone at a ratio of 2% by mass, and 20% of the blend mass of nanoparticles was added Al 2 o 3 , heated and stirred at a temperature of 45°C for 4 hours in a flask with a reflux tube.

[0036] (2) After completely dissolving, soak the non-activated support polypropylene (PP) with higher mechanical strength in the gel liquid obtained in step (1), take it out after 15 minutes, and dry it naturally to obtain a certain Thickness of Supported Nanoparticle-Doped Gel-Polymer Membranes for Li-ion Batteries.

[0037] (3) After the polymer film is cut to an appropriate size, it is placed in a vacuum drying oven at 45°C for 15 hours under vacuum, and then quickly transferred to a glove box (Mikrouna Super 12201750, which is used to control the water content in the environment to less than 60ppm , the oxygen content is less than 2000ppm). The polymer membrane was soaked in...

Embodiment 2

[0039] (1) Under an inert gas atmosphere, the PEO and PVDF-HFP blends with a mass ratio of 1:2 were dissolved in acetone at a ratio of 1.5% by mass, and 5% of the blend mass of nanoparticles was added al 2 o 3 , heated and stirred at 40°C for 5 hours with a flask equipped with a reflux tube.

[0040] (2) After completely dissolving, soak the unactivated support body polyethylene (PE) with higher mechanical strength in the gel liquid obtained in step (1), take it out after 15 minutes, and dry it naturally, that is, a certain Thickness of Supported Nanoparticle-Doped Gel-Polymer Membranes for Li-ion Batteries.

[0041] (3) After the polymer film is cut to an appropriate size, it is placed in a vacuum drying oven at 40° C. for 20 hours in vacuum and then quickly transferred to a glove box. After the polymer film was soaked in the electrolyte for 2 hours, a supported nanoparticle-doped lithium-ion battery gel polymer electrolyte was obtained.

Embodiment 3

[0043] (1) Under an inert gas atmosphere, the blend of PEO and PVDF-HFP with a mass ratio of 1:3 was dissolved in N-N-dimethylformamide (DMF) at a ratio of 2.5% by mass, and added 10% nanoparticle SiO by mass of the blend 2 , heated and stirred with a flask with a reflux tube at a temperature of 50° C. for 6 hours.

[0044] (2) After completely dissolving, soak the unactivated support non-woven fabric with high mechanical strength in the gel liquid obtained in step (1), take it out after 12 minutes, and dry it naturally, that is, a certain thickness of non-woven fabric is prepared. Supported nanoparticle-doped gel-polymer membranes for lithium-ion batteries.

[0045] (3) After the polymer film is cut into an appropriate size, it is placed in a vacuum drying oven at 50° C. for 17 hours in vacuum and then quickly transferred to a glove box. After the polymer film was soaked in the electrolyte for 1 hour, a supported nanoparticle-doped lithium-ion battery gel polymer electrolyt...

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Abstract

The invention discloses lithium ion battery gel polymer electrolyte of supported doped nano particles, a preparation method and an application thereof. The preparation method of the electrolyte comprises the following steps: firstly, nano particles are doped in a mixture PEO and P (VDF-HPF) and are dissolved by using a solvent to obtain gel; then, a supporter membrane which is not activated and has good mechanical strength is soaked in the gel, taken out and aired to obtain a polymer membrane; and finally, after being dried, the membrane is soaked in electrolyte in a glove box so as to obtainthe electrolyte. The polymer electrolyte has higher ionic conductivity and mechanical strength; simultaneously, the preparation time is short, the production efficiency is high, the invention is compatible to the existing equipment for preparing liquid state lithium ion batteries, and the production cost required by industrialization is greatly reduced.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery gel polymer electrolyte supported by a support body and doped with nanoparticles, and a preparation method and application thereof. Background technique [0002] Gel Polymer Electrolyte (GPE) has attracted extensive interest of researchers since its inception due to the combination of high ionic conductivity of liquid lithium-ion batteries and good safety of solid-state lithium-ion batteries. So far, many polymers used as GPE matrix have been reported, such as polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), polyacrylonitrile (PAN), polymethacrylate Ester (PMMA), polyethylene oxide (PEO), polyvinyl chloride (PVC), etc. However, there are still some defects in the above-mentioned matrix: (1) the conductivity at room temperature is low, and there is still a certain gap from the level of liquid electrolyte; (2) the me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/38H01M10/40
CPCY02E60/10Y02P70/50
Inventor 廖友好饶睦敏邢丽丹李伟善陈朗
Owner SOUTH CHINA NORMAL UNIVERSITY
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