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Ultrathin polymer electrolyte membrane based on porous polyimide and preparation method thereof

A technology of polyimide membrane and electrolyte membrane, which is applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve the problems of reducing mechanical strength, increasing membrane rupture, safety accidents, etc., and achieves low interface impedance, excellent performance effect

Active Publication Date: 2021-07-09
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolyte membrane also acts as a separator, and the thinning of the membrane will inevitably reduce its mechanical strength and increase the risk of membrane rupture or lithium dendrite piercing, both of which can cause internal short circuits in the battery, leading to battery failure. even security incidents
Therefore, the challenges associated with the design of thin electrolyte membranes mainly lie in the trade-off between minimizing thickness and maintaining mechanical strength

Method used

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  • Ultrathin polymer electrolyte membrane based on porous polyimide and preparation method thereof
  • Ultrathin polymer electrolyte membrane based on porous polyimide and preparation method thereof
  • Ultrathin polymer electrolyte membrane based on porous polyimide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: the preparation of ultra-thin polymer electrolyte membrane (SPE-1)

[0036] 1,2-Ethanedithiol (EDT) and diethylene glycol divinyl ether (DGDE) were the reactive monomers, and 2,2-dimethoxy-2-phenylacetophenone (DMPA) was the photoinitiated Lithium bistrifluorosulfonyl imide (LiTFSI, formula IV (a)) is a small molecule lithium salt, pentaerythritol tetraacrylate (PET4A, formula II (a)) is a crosslinking agent, and anhydrous tetrahydrofuran (THF) is solvent.

[0037] The following operations were all carried out in a glove box under an argon atmosphere. The reaction is divided into two steps. The first step: add EDT and DGDE to a 20mL small glass bottle, then add DMPA, stir it in the dark to dissolve it completely, and initiate the reaction under 365nm ultraviolet light to prepare a sulfhydryl-terminated linear Ion-conducting polymer (formula I(d)); the second step: add LiTFSI, PET4A, THF and DMPA to the above product, stir in the dark to dissolve complete...

Embodiment 2

[0044] Embodiment 2: the preparation of ultra-thin polymer electrolyte membrane (SPE-2)

[0045]1,2-Ethanedithiol (EDT) and diethylene glycol divinyl ether (DGDE) were the reactive monomers, and 2,2-dimethoxy-2-phenylacetophenone (DMPA) was the photoinitiated Lithium perchlorate (LiClO4, formula IV (i)) is a small molecule lithium salt, hexaeugenol cyclotriphosphazene (HECTP, formula III (a)) is a crosslinking agent, and anhydrous tetrahydrofuran (THF) is a solvent .

[0046] Except that the small molecule lithium salt and the cross-linking agent were changed, the dosage and operation steps of each reagent were the same as in Example 1.

[0047] In the linear ion-conducting polymer, q is preferably 10-25.

[0048] The molar ratio of the linear ion-conducting polymer to HECTP is 3:1.

[0049] The mass proportion of the lithium salt in the ultra-thin polymer electrolyte membrane is 25%.

[0050] The added amount of DMPA is 3%.

[0051] The added amount of the solvent THF is...

Embodiment 3

[0053] Embodiment 3: the preparation of ultra-thin polymer electrolyte membrane (SPE-3)

[0054] 1,2-Ethanedithiol (EDT) and diethylene glycol divinyl ether (DGDE) were the reactive monomers, and 2,2-dimethoxy-2-phenylacetophenone (DMPA) was the photoinitiated Agent, lithium bistrifluorosulfonyl imide (LiTFSI, formula IV (a)) is a small molecule lithium salt, hexaeugenol cyclotriphosphazene (HECTP, formula III (a)) is a crosslinking agent, anhydrous tetrahydrofuran ( THF) as solvent.

[0055] Except that the cross-linking agent was changed, the dosage and operation steps of each reagent were the same as in Example 1.

[0056] In the linear ion-conducting polymer, q is preferably 10-25.

[0057] The molar ratio of the linear ion-conducting polymer to HECTP is 3:1.

[0058] The mass proportion of the lithium salt in the ultra-thin polymer electrolyte membrane is 30%.

[0059] The added amount of DMPA is 5%.

[0060] The added amount of the solvent THF is 30% of the total ma...

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Abstract

The invention discloses an ultrathin polymer electrolyte membrane based on porous polyimide and a preparation method thereof. The ultrathin polymer electrolyte membrane is prepared by mixing a sulfydryl-terminated linear conductive ion polymer with a multi-olefin cross-linking agent and a small-molecular lithium salt, directly pouring the mixture on a porous polyimide membrane, and carrying out illumination and in-situ alkene-sulfydryl click reaction polymerization. The thickness (10-40 m) of a prepared ultrathin polymer electrolyte is at a leading level in the currently reported literature, and the ultrathin polymer electrolyte has certain mechanical strength and can be used as a solid electrolyte membrane of a lithium ion battery. In addition, the electrolytic membrane can also be prepared on a lithium negative electrode in situ, and a battery assembled through in-situ reaction has lower interface impedance and more excellent performance.

Description

technical field [0001] The invention belongs to the field of solid electrolytes for lithium ion batteries and lithium sulfur batteries. More specifically, it relates to an ultrathin polymer electrolyte membrane based on porous polyimide and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used due to their high specific energy density, high operating voltage, long cycle life, low self-discharge rate, and no memory effect. However, traditional lithium-ion batteries use organic liquid electrolytes, which Quasi-electrolytes are volatile, flammable, and explosive, and there are great safety hazards. Using organic solid electrolytes is an effective way to solve the above problems. [0003] At present, the organic solid electrolytes reported at home and abroad mainly include all-solid electrolytes and gel polymer electrolytes. Among them, the performance of all-solid electrolytes has been greatly improved due to their relatively l...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/052H01M10/0525
CPCH01M10/0565H01M10/052H01M10/0525H01M2300/0082Y02E60/10
Inventor 王拴紧李志峰钟雷孟跃中肖敏韩东梅
Owner SUN YAT SEN UNIV
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