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Composite solid polymer electrolyte and preparing method and application thereof

A solid polymer and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of poor contact stability and low mechanical strength, and achieve the effects of large migration steric hindrance, improved lithium ion migration coefficient, and large volume.

Inactive Publication Date: 2017-01-04
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the defects of poor contact stability and low mechanical strength between the solid polymer electrolyte and the electrode interface in the prior art, the present invention provides a composite solid polymer electrolyte and its preparation method and application

Method used

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  • Composite solid polymer electrolyte and preparing method and application thereof
  • Composite solid polymer electrolyte and preparing method and application thereof
  • Composite solid polymer electrolyte and preparing method and application thereof

Examples

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Embodiment 1

[0052] A composite solid polymer electrolyte prepared from enolate monomers, lithium salts, porous support matrix, additives, and initiators; its thickness is 120 μm, and its ion conductivity at 25°C is 7.0×10 -4 S / cm -1 , the ionic conductivity can reach 1.6×10 at 50°C -3 S / cm -1 ,Such as figure 1 shown. The specific preparation method is as follows:

[0053] (1) Under the condition of nitrogen atmosphere protection, take 2.6g tripropylene glycol dipropylene ester (TPGDA), 0.5g succinonitrile and 0.5g lithium bistrifluoromethanesulfonylimide, mix them, and stir at 40°C for 3h , after dissolving evenly, a viscous mixture is obtained;

[0054] (2) Add 0.12 g of azobisisobutyronitrile to the mixture obtained in (1), and stir at 20°C for 3 hours;

[0055] (3) Immerse the cut and dried polyimide non-woven fabric in the mixture obtained in (2), first ultrasonically treat it for 15 minutes, and then continue to soak for 5 hours until the non-woven fabric is completely saturat...

Embodiment 2

[0059] The difference between this embodiment and Example 1 is that the acrylate monomer is a mixture of propoxylated trimethylolpropane triacrylate (TPPTA) and ethylene glycol methacrylate (EGMEM) ; Propoxylated trimethylolpropane triacrylate (TPPTA): ethylene glycol methacrylate (EGMEM): succinonitrile: the mass ratio of bistrifluoromethylsulfonimide lithium is 3:1: 1:1; the initiator is azobisisobutyronitrile, and the mass is 5wt% of the mixed monomer; the baking temperature after sealing is 80°C; the thickness of the prepared composite solid polymer electrolyte is about 110 μm.

Embodiment 3

[0061] The difference between this embodiment and Example 1 is that the acrylate monomers are two kinds of propoxylated trimethylolpropane triacrylate (TPPTA) and ethoxylated trimethylolpropane triacrylate (ETPTA). A mixture of monomers; the lithium salt is composed of two lithium salts, lithium trifluoromethanesulfonate and lithium bistrifluoromethylsulfonimide (LiTFSI); propoxylated trimethylolpropane triacrylate (TPPTA ): ethoxylated trimethylolpropane triacrylate (ETPTA): succinonitrile: lithium bistrifluoromethanesulfonimide: lithium trifluoromethanesulfonate in a mass ratio of 6:2:2: 1:1; the initiator is azobisisobutyronitrile, and the mass is 6wt% of the mixed monomer; the baking temperature after sealing is 80°C; the thickness of the prepared composite solid polymer electrolyte is about 115 μm.

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Abstract

The invention discloses a composite solid polymer electrolyte and a preparing method and application thereof. The composite solid polymer electrolyte is prepared from a gadoleic acid ester monomer, a porous supporting matrix, lithium salt, an additive and an initiator, wherein the mass ratio of the gadoleic acid ester monomer to the additive is (1-10):1, the lithium salt accounts for 5-30% of the total mass of the gadoleic acid ester monomer and the additive, and the mass ratio of the initiator to the gadoleic acid ester monomer is (1-10):100. The composite solid polymer electrolyte prepared with the method has the advantages of being large in ion conductivity, high in mechanical strength, easy to form, stable in interface contact, high in electrochemical stability and easy to prepare and can be used for forming solid lithium ion secondary batteries, and the prepared solid lithium ion secondary batteries are high in safety, energy density and production efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a solid polymer electrolyte and its preparation method and application, in particular to a composite solid polymer electrolyte supported by a porous matrix, its preparation method and its application in solid lithium ion batteries . Background technique [0002] In the current society, the crisis of energy shortage, environmental pollution and climate change is deepening, and it is urgent to develop various new energy technologies to replace the current energy utilization mode. As an efficient and environmentally friendly electrochemical energy storage technology, lithium-ion batteries have excellent properties such as high energy density, high specific power, long life, and low self-discharge rate. They have been widely used in portable devices, electric vehicles, and energy storage. . [0003] However, the carbonate-based organic electrolyte commonly used in tradi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 王振波贺克武周玉祥陈世彬何业峰
Owner HARBIN INST OF TECH
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