Three-dimensional crosslinked network polymer gel electrolyte membrane, preparation method and lithium-ion battery

A gel electrolyte, three-dimensional cross-linking technology, used in non-aqueous electrolyte batteries, electrolyte battery manufacturing, electrolyte immobilization/gelation, etc. Low problems, to achieve the effects of good interface compatibility, avoidance of leakage, and good mechanical stability

Active Publication Date: 2016-09-21
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the cross-linked GPE supported by polyolefin microporous membrane exhibits sufficient mechanical properties, the polyolefin separator has low porosity, poor dimensional stability at high temperature, and low ionic conductivity.

Method used

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  • Three-dimensional crosslinked network polymer gel electrolyte membrane, preparation method and lithium-ion battery
  • Three-dimensional crosslinked network polymer gel electrolyte membrane, preparation method and lithium-ion battery
  • Three-dimensional crosslinked network polymer gel electrolyte membrane, preparation method and lithium-ion battery

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preparation example Construction

[0037] See figure 1 The present invention provides a method for preparing a three-dimensional cross-linked network gel polymer electrolyte membrane. The three-dimensional cross-linked network gel polymer electrolyte membrane is mainly used in a lithium ion battery (not shown), which includes the following steps:

[0038] Step S1, mixing a certain amount of linear polymer, polyethylene glycol diglycidyl ether, bisphenol A diglycidyl ether, polyether amine and a solvent to obtain a precursor solution A.

[0039] Specifically, the linear polymer is first added to the solvent, heated and stirred to dissolve the linear polymer to obtain a linear polymer solution, and then polyethylene glycol diglycidyl ether and bisphenol A diglycidyl are added to the linear polymer solution Ether and polyetheramine are stirred and mixed uniformly to obtain a colorless and transparent precursor solution A.

[0040] Among them, the linear polymer accounts for 5-30% of the mass of the solution. The linear ...

Embodiment 1

[0052] This embodiment relates to a method for preparing a three-dimensional cross-linked network gel polymer electrolyte membrane. The method includes the following steps:

[0053] (1) Add 0.12g of polyvinylidene fluoride-hexafluoropropylene into a 25ml beaker, then add 5.0g of N,N-dimethylformamide dropwise, stir to make it completely dissolved, and then weigh 0.3g of polyethylene Glycol diglycidyl ether (Mn=500), 0.1g of bisphenol A diglycidyl ether (epoxy value of 186) and 0.8g of polyetheramine (Mn=2000) were added to the beaker, and stirred for 6h to mix evenly. And pour the above solution into a clean polytetrafluoroethylene mold, put it in a constant temperature blast oven for a period of time, and perform ring-opening polymerization at a constant temperature of 80°C for 24 hours to obtain a heat-cured three-dimensional crosslinked network polymer film;

[0054] (2) The prepared three-dimensional cross-linked network polymer membrane was washed three times with absolute eth...

Embodiment 2

[0067] This embodiment relates to a method for preparing a three-dimensional cross-linked network polymer gel electrolyte membrane. The method includes the following steps:

[0068] (1) Add 0.12g of polymethyl methacrylate into a 25ml beaker, then add 5.0g of N,N-dimethylformamide dropwise, stir to completely dissolve, and then weigh out 0.1g of polyethylene glycol Diglycidyl ether (Mn=1000), 0.1g of bisphenol A diglycidyl ether (epoxy value of 290) and 0.8g of polyetheramine (Mn=1000) were added to the beaker, and stirred for 6 hours to mix evenly. And pour the above solution into a clean polytetrafluoroethylene mold, and place it in a constant temperature blast oven for a period of time after ring-opening polymerization at a constant temperature of 120°C for 8 hours to obtain a heat-cured three-dimensional crosslinked network polymer film;

[0069] (2) The prepared three-dimensional cross-linked network polymer membrane was washed three times with absolute ethanol to remove resid...

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Abstract

The invention provides a preparation method of a three-dimensional crosslinked network polymer gel electrolyte membrane. The method comprises the following steps of: (S1) mixing a linear polymer, polyethylene glycol diglycidyl ether, bisphenol A diglycidyl ether, polyether amine and a solvent to obtain a precursor solution; (S2) heating the precursor solution A for constant-temperature reaction for a period of time to obtain a three-dimensional crosslinked network polymer membrane; and (S3) immersing the three-dimensional crosslinked network polymer membrane into a liquid electrolyte for adsorption to saturation, thereby preparing the three-dimensional crosslinked network polymer gel electrolyte membrane. The three-dimensional crosslinked network polymer gel electrolyte membrane prepared by the method is good in mechanical stability, high in ionic conductivity and good in lithium metal interface compatibility. The invention further provides the three-dimensional crosslinked network polymer gel electrolyte membrane prepared by the preparation method, and a lithium-ion battery employing the three-dimensional crosslinked network polymer gel electrolyte membrane.

Description

Technical field [0001] The present invention relates to the field of polymer gel electrolyte for lithium secondary batteries, in particular to a three-dimensional crosslinked network polymer gel electrolyte membrane and a preparation method thereof. Background technique [0002] Currently, graphitized carbon materials are commonly used as anode materials for commercial lithium-ion batteries, with a theoretical specific capacity of 372mAhg -1 , About one-tenth of the theoretical specific capacity of lithium metal anode, the high specific energy advantage of lithium batteries has not been effectively brought into play. Although the theoretical specific capacity of metallic lithium is as high as 3860mAhg -1 , Is one of the currently known negative electrode materials with the highest mass ratio energy, but metal lithium has not been used in commercial battery systems on a large scale, mainly due to the following problems in metal lithium electrodes that have not been effectively solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M10/0565
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0085Y02E60/10Y02P70/50
Inventor 卢青文李宝华杨全红贺艳兵康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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