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Composite polymer gel solid electrolyte, preparation method thereof and application of composite polymer gel solid electrolyte in lithium metal battery

A solid-state electrolyte and composite polymer technology, applied in the field of energy storage, can solve problems such as uneven deposition, achieve uniform deposition, promote dissociation of lithium salts, and inhibit the growth of lithium dendrites

Active Publication Date: 2021-09-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a composite polymer gel solid state electrolyte, its preparation method and the application of lithium metal batteries, which fully combines the characteristics and requirements of the gel polymer electrolyte, and aims at Gel polymer solid electrolyte membrane structure design, used to solve the problem of uneven deposition of lithium ions on lithium metal negative electrodes in lithium metal batteries in the prior art

Method used

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  • Composite polymer gel solid electrolyte, preparation method thereof and application of composite polymer gel solid electrolyte in lithium metal battery
  • Composite polymer gel solid electrolyte, preparation method thereof and application of composite polymer gel solid electrolyte in lithium metal battery
  • Composite polymer gel solid electrolyte, preparation method thereof and application of composite polymer gel solid electrolyte in lithium metal battery

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preparation example Construction

[0043] The present invention provides a method for preparing a composite gel polymer solid electrolyte, comprising the steps of: Preparation of silica nanospheres and adding a silane coupling agent, to obtain silica beads with a double bond, followed by addition of a polymer such as monomers, polymerized onto the polymer precipitated silica beads co-distillation, and finally etching the resulting silicone balls polymer microcapsules; polymer blends of the polymer and the microcapsules obtained polymer composite polymeric film; the composite film is placed in different organic polymer gelled electrolyte, gel polymerization to obtain the compound solid electrolyte material.

[0044] Method for the catalysis of TEOS at a basic catalyst to produce silanol groups (Si-OH) hydrolysis reaction, thereby obtaining another dehydrating polycondensation silica spheres. Catalyzed conditions volume fraction of 50% to 80% ethanol, 10% to 20% deionized water, 5% to 15% aqueous ammonia, 5% to 15...

Embodiment 1

[0052] The 200mL ethanol, 10mL 20 mL deionized water and aqueous ammonia were sequentially added 500mL three-necked flask was charged with a magnetic seal with a glass stopper, within 5min stirring vigorously on a magnetic stirrer until their mixed uniformly, three-neck flask was placed deg.] C constant temperature water bath 30 into the 11mL tetraethyl orthosilicate was slowly added dropwise the above solution was mixed while stirring with a magnetic stirrer heating. Upon completion, the use of sealed glass stopper, reaction 5h. The above reaction to be completed, continuing dropwise 1mL 3- (methacryloyl chloride) propyl trimethoxysilane, 30 deg.] C water bath was stirred for 5h, centrifuged, and washed.

[0053] Weigh 0.2g of the silane coupling agent is grafted to the silica powder was added 100mL one-neck round flask containing 80mL of acetonitrile was distilled ultrasonic dispersion 2h, the solution to be uniformly dispersed, sequentially 0.6mL polyethylene glycol methacrylat...

Embodiment 2

[0086] 200 ml of anhydrous ethanol, 20 ml of deionized water and 10 mL aqueous solution were sequentially added to a three-mouth flask, and the magnet was placed with a glass plug seal, and the mixture was stirred vigorously for 5 minutes to be mixed, and three flasks were released Entit-temperature water bath cooker was added at a constant temperature water bath, and 11 ml of tetraeth ester was slowly added to the above mixed uniform solution and stirred with a magnetic stirrer. After the dropwise addition, the glass plug seal was used, and the reaction was 5 h, resulting in 200 nm silicon ball.

[0087] A 0.025 g of silicon ball was dispersed in N, N-dimethylformamide solvent, and the ultrasound was adjusted to obtain an ultrasound 1.5 h to obtain a uniformly dispersed silicon ball solution. 0.5 g of polyvinylidene fluoride-hexafluoropropylene was then added to the DMF solvent, and the mixture was stirred at 50 ° C for 3 h. The ultrasonic dispersed silicon sphere is mixed into a...

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Abstract

The invention discloses a composite gel polymer electrolyte, a preparation method thereof and application of the composite gel polymer electrolyte in a lithium metal battery. The preparation method comprises the following steps of: synthesizing nano silicon spheres through adopting a passing method, then introducing double bonds through using a silane coupling agent, adding a polymer monomer, polymerizing macromolecules on the surfaces of the silicon spheres through adopting a precipitation co-distillation method to form core-shell microspheres, and finally etching the silicon spheres to obtain the polymer microcapsules; adding the polymer microcapsules serving as filler into a polymer matrix to obtain a composite polymer film, and finally putting the composite polymer film into different electrolytes for gelation to obtain the composite gel polymer electrolyte. The polymer microcapsules and polyvinylidene fluoride-hexafluoropropylene have good compatibility, so that the polymer microcapsules are prevented from being agglomerated in the film, and the problem that the crystallinity of the polyvinylidene fluoride-hexafluoropropylene is greatly reduced is solved. The composite gel polymer electrolyte has the advantages of compactness and uniformity, can promote uniform deposition of lithium ions on a lithium negative electrode, and is matched with a lithium metal battery to obtain good battery performance.

Description

Technical field [0001] The present invention relates to the field of energy storage technology, and more particularly to a composite gel polymer solid electrolyte, a method of preparing a method and a lithium metal battery. Background technique [0002] Metal lithium negative electrode with extremely high capacity (3860mAh g -1 ) And the most negative potential (-3.040V VS standard hydrogen electrode) is called a secondary lithium battery "Holy Cup" electrode. Metal lithium batteries with metal lithium-oriented electrode are high-specific batteries for the foreground. With the increasing amount of battery energy density requirements in the field of advanced portable electronic products, electric vehicles, the high-grade battery based on metal lithium negative electrode has become a research hotspot in the field of chemical power supply in recent years, and the metal lithium negative electrode has been re-received Special attention. [0003] However, the use of metal lithium produ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525Y02P70/50
Inventor 杨文翟鹏飞陈人杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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