Non-combustible gel electrolyte and preparation method and application thereof, and sodium ion battery

A gel electrolyte and electrolyte technology, which is applied in the field of battery electrolyte, can solve the problems of poor safety and achieve the effects of improving stability, good cycle performance and rate performance, good flame retardancy and thermal stability

Active Publication Date: 2020-05-22
BEIJING INST OF NANOENERGY & NANOSYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of poor safety of polymer gel electrolytes in the prior art and further improvement of battery performance, to provide a non-combustible gel electrolyte, its preparation method and application, and a sodium-ion battery. The flammable gel electrolyte can greatly improve the safety performance of the battery while ensuring the performance of the battery

Method used

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  • Non-combustible gel electrolyte and preparation method and application thereof, and sodium ion battery
  • Non-combustible gel electrolyte and preparation method and application thereof, and sodium ion battery
  • Non-combustible gel electrolyte and preparation method and application thereof, and sodium ion battery

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preparation example Construction

[0024] The polymer film in the present invention is most preferably made of electrospun polyvinylidene fluoride-hexafluoropropylene copolymer (ie, electrospun PVDF-HFP film), which electrospun polyvinylidene fluoride-hexafluoropropylene copolymer The preparation method of the compound specifically includes: adding 0.1-0.2 g / mL of PVDF-HFP (poly(vinylidene fluoride-co-hexafluoropropylene)) into N,N-dimethyl In the mixed solution formed by acetamide and acetone, after stirring evenly, electrospinning is performed at the electrospinning speed of 0.3-0.8mL / h for 1-2h to form.

[0025] In order to further improve the stability of the electrolyte of the battery and the wettability of the electrolyte and the polymer matrix, preferably, the organic solvent is at least one selected from carbonates, alcohol ethers and alkyl ethers. Wherein, the carbonate is preferably at least one of ethylene carbonate, dimethyl carbonate, diethyl carbonate and ethyl methyl carbonate; the alcohol ether ...

specific Embodiment approach

[0039] According to a specific embodiment of the present invention, the method further includes: before the drying in step c), cleaning the composite membrane filled with solid oxide, and then performing the drying. The present invention has no special limitation on the cleaning conditions. Preferably, the solid oxide-filled composite membrane is cleaned 3-5 times with an alcoholic solvent (preferably isopropanol). The present invention has no particular limitation on the drying conditions. Preferably, the drying conditions include: drying at a temperature of 50-70° C. for 24-72 hours. More preferably, the drying is vacuum drying. The pressure of the vacuum drying is not particularly limited, and can be performed according to conventional technical means in the art.

[0040] In order to further improve the bonding performance between the electrolyte and the polymer matrix, and stabilize the structure of the prepared gel electrolyte, preferably, the method also includes, before...

Embodiment 1

[0054] This embodiment is used to provide a non-flammable gel electrolyte, and the preparation method of the non-flammable gel electrolyte is as follows:

[0055] (1) Prepare the polymer matrix: the molar ratio is 1:3:2:2.4×10 -3 Tetraethyl silicate, isopropanol, water and hydrochloric acid were mixed to form solution A, stirred for 3h to obtain the condensation product; 40μL of the condensation product was introduced into the electrospun PVDF-HFP film (diameter 16mm, thickness 100μm, 1.5gPVDF-HFP was dissolved In a mixed solution of 3mL N,N-dimethylacetamide and 6mL of acetone, the composite membrane precursor was formed by electrospinning at an electrospinning rate of 0.5mL / h for 1.5h, the same below).

[0056] The molar ratio is 3:7.2×10 -3 isopropanol and NH 3 Amount of ammonia (the mass concentration of ammonia is 25% by weight) is mixed to form solution B, and 200 μL solution B is added dropwise at a speed of 0.5mL / min to the composite membrane precursor to obtain SiO ...

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Abstract

The invention relates to the field of battery electrolytes, and discloses a non-combustible gel electrolyte and a preparation method and an application thereof, and a sodium ion battery. The electrolyte comprises a polymer matrix and an electrolyte, based on the total amount of the electrolyte, the content of the electrolyte is 60-90 wt%, the content of the polymer matrix is 10-40 wt%, the polymermatrix comprises a polymer film, and the electrolyte comprises a composite solvent and a sodium salt, and the composite solvent comprises an organic solvent and a flame retardant. According to the sodium ion battery assembled by the non-combustible gel electrolyte, the safety performance of the battery can be greatly improved while the performance of the battery is ensured.

Description

technical field [0001] The invention relates to a battery electrolyte, in particular to a non-combustible gel electrolyte, a preparation method and application thereof, and a sodium ion battery. Background technique [0002] Secondary batteries have good charge and discharge performance and high energy density, and can be used in portable mobile devices. A secondary battery mainly includes a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte is the carrier of ion transmission in the battery. In order to improve the ion transmission rate, the electrolyte is usually composed of metal salts and organic solvents. However, due to the low volatility of organic solvents, it is easy to cause combustion or explosion. [0003] In recent years, polymer gel electrolytes have attracted extensive attention due to their better battery performance and safety than liquid electrolytes. On the one hand, due to the interaction between the polymer matrix...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/054
CPCH01M10/054H01M10/0565H01M2300/0082Y02E60/10
Inventor 孙春文易强
Owner BEIJING INST OF NANOENERGY & NANOSYST
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