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Gel electrolyte diaphragm, preparation method thereof and lithium ion battery

A technology of gel electrolyte and diaphragm, which is applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems affecting the formation of SEI film, achieve the elimination of doping or coating modification, save production costs, and improve the electrical conductivity. high rate effect

Pending Publication Date: 2021-04-06
SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: for the Mn in lithium manganate material battery in the prior art 2+ Deposited on the negative electrode, affecting the formation of the SEI film, providing a gel electrolyte separator and its preparation method, lithium-ion battery

Method used

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  • Gel electrolyte diaphragm, preparation method thereof and lithium ion battery
  • Gel electrolyte diaphragm, preparation method thereof and lithium ion battery
  • Gel electrolyte diaphragm, preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0053] Another embodiment of the present invention provides a preparation method of a gel electrolyte separator, comprising the following steps:

[0054] S1, mix the high molecular polymer material with an organic solvent, stir and heat in a water bath to obtain a mixture;

[0055] S2, adding bistrifluoromethanesulfonimide lithium and guanidine salt ionic liquid to the mixture, stirring to obtain a milky white gel polymer;

[0056] S3, cast the gel polymer on the carrier, and then use a scraper to scrape the membrane;

[0057] S4, drying the carrier in a vacuum drying oven to obtain a gel electrolyte membrane.

[0058] In one embodiment, the specific operation of step S1 is to add high molecular polymer material and pore-forming agent to the weighing bottle for mixing, for example, adding polyvinylidene fluoride (PVDF) and polyvinylpyrrolidone (PVP) for mixing. , then add N,N-dimethylformamide (DMF) and dichloromethane (DCM) dropwise to the weighing bottle with a dropper, pl...

Embodiment 1

[0070] This example is used to illustrate the gel electrolyte separator disclosed in the present invention and the preparation method thereof.

[0071] In terms of mass percentage, the gel electrolyte separator includes the following weight components: 71.43 parts of polyvinylidene fluoride, 2.14 parts of polyvinylpyrrolidone, 21.43 parts of lithium bistrifluoromethanesulfonimide and 5.0 parts of guanidine salt ions liquid. In the guanidine salt ionic liquid, X is Cl, R 1 , R 2 , R 3 , R 4 Both are n-hexyl, R 5 , R 6 Not limited.

[0072] The preparation method of the gel electrolyte separator comprises the following steps:

[0073] (1) Add 10.0g PVDF (polyvinylidene fluoride) and 0.30g PVP (polyvinylpyrrolidone) to the weighing bottle, then add 20ml DMF and 5ml DCM dropwise to the weighing bottle as a solvent with a dropper, and weigh The bottle was stirred on a magnetic stirrer, heated in a water bath at 35°C and stirred for 6h;

[0074] (2) In step (1), the weighin...

Embodiment 2

[0098] In terms of mass percentage, the gel electrolyte separator includes the following weight components: 68.44 parts of polyvinylidene fluoride, 1.03 parts of polyvinylpyrrolidone, 20.53 parts of lithium bistrifluoromethanesulfonimide and 10 parts of guanidine salt ions liquid. In the guanidine salt ionic liquid, X is BF 6 , R 1 , R 2 , R 3 , R 4 Both are n-octyl, R 5 , R 6 Not limited.

[0099] The preparation method of the gel electrolyte separator comprises the following steps:

[0100] (1) Add 10.0g PVDF (polyvinylidene fluoride) and 0.15g PVP (polyvinylpyrrolidone) to the weighing bottle, then drop 17ml DMF and 8ml DCM into the weighing bottle as a solvent with a dropper, and weigh The bottle was stirred on a magnetic stirrer, heated in a water bath at 40°C and stirred for 5h;

[0101] (2) The weighing bottle in step (1) was removed from the stirrer, and 3g of lithium bistrifluoromethanesulfonimide and 1.46g of guanidine salt ionic liquid were added, and then ...

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Abstract

The invention belongs to the technical field of battery materials, and particularly relates to a gel electrolyte diaphragm, a preparation method thereof and a lithium ion battery. The gel electrolyte diaphragm comprises a high-molecular polymer material, lithium bis(trifluoromethanesulfonyl) imide and guanidine salt ionic liquid. The guanidine salt ionic liquid in the gel electrolyte diaphragm has the advantages of stability, no volatilization, long service life, high conductivity and the like, and nitrogen contains lone pair electrons which can be coordinated with metal ions and particularly have a strong attraction effect on Mn<2+>, so that Mn<2+> generated by disproportionation reaction of a lithium manganate material is extracted; and Mn<2+> is prevented from attaching to the negative electrode to cause capacity attenuation. The gel electrolyte diaphragm is a porous polymer diaphragm, is suitable for being used in a lithium manganate battery, and can effectively prevent Mn<2+> from migrating to a negative electrode through an electrolyte.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a gel electrolyte separator, a preparation method thereof, and a lithium ion battery. Background technique [0002] Among a variety of lithium-ion battery cathode materials, lithium manganate cathode materials are widely favored by scholars due to their low cost, environmental friendliness, and high safety performance. However, at high temperature, the Mn ions of the lithium manganate material dissolve, and the dissolved Mn ions will undergo a disproportionation reaction 2Mn 3+ →Mn 2+ +Mn 4+ , free Mn 2+ It will be quickly converted into black manganese precipitate and deposited on the negative electrode, which hinders the formation of SEI film, affects the reversible deintercalation of lithium ions, and seriously affects the capacity of lithium manganate materials. How to prevent lithium manganate materials from Mn 2+ Deposition to the negative electrod...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M50/414H01M50/403H01M10/0525
CPCH01M10/0565H01M10/0525Y02E60/10
Inventor 李婕斯王淼蔡守珂
Owner SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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