Preparation method of composite solid polymer electrolyte

A solid-state polymer and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of inability to take into account the performance of polymer electrolytes, unfavorable large-scale production, and decline in mechanical properties, and achieve good safety and stability. stability and cycling performance, capacity retention, effect of increasing stability

Inactive Publication Date: 2019-05-14
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the usual modification methods cannot take into account the requirements for the various properties of polymer electrolytes
For example, adding a liquid plasticizer to the polymer electrolyte can effectively improve the ionic conductivity of the polymer electrolyte, but its mechanical properties will be severely reduced, and due to the presence of liquid components, its heat resistance will also be affected to a certain extent, although through Mixing ceramic fillers into it can make up for the problem of mechanical performance decline, but the multi-phase compounding also makes the system more complicated and the preparation process increases, which is not conducive to large-scale production

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  • Preparation method of composite solid polymer electrolyte
  • Preparation method of composite solid polymer electrolyte
  • Preparation method of composite solid polymer electrolyte

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Embodiment 1

[0025] This embodiment includes the following steps:

[0026] (1) Add urea to a quartz crucible, heat at 550 degrees Celsius for 4 hours in an air atmosphere, and obtain graphite phase carbon nitride g-C with a thinner sheet thickness 3 N 4 , where the heating rate is 5°C / min.

[0027] (2) the graphite phase carbon nitride g-C prepared in the step (1) 3 N 4 , polyethylene oxide PEO, and lithium bistrifluoromethanesulfonimide LiTFSI were mixed, and then acetonitrile was added and stirred until the system was uniform to obtain a mixed solution.

[0028] Based on the mass of polyethylene oxide PEO, lithium bistrifluoromethanesulfonimide LiTFSI accounts for 30% of its mass fraction; graphite phase carbon nitride g-C 3 N 4 Accounting for 5% of its mass fraction, the amount of acetonitrile added is such that polyethylene oxide PEO, bistrifluoromethanesulfonimide lithium LiTFSI and graphite phase carbon nitride g-C can be completely dissolved. 3 N 4 A mixture of the three is e...

Embodiment 2

[0040] This embodiment includes the following steps:

[0041] (1) Dicyandiamide is added in a quartz crucible, and heated for 8 hours at 500 degrees Celsius in an air atmosphere to obtain graphite phase carbon nitride g-C with a thinner sheet thickness 3 N 4 , where the heating rate was 5°C / min.

[0042] (2) the graphite phase carbon nitride g-C prepared in the step (1) 3 N 4 , polyethylene oxide PEO, and lithium bistrifluoromethanesulfonimide LiTFSI are mixed, and then acetonitrile is added and stirred until the system is uniform to obtain a mixed solution;

[0043] Based on the mass of polyethylene oxide PEO, lithium bistrifluoromethanesulfonimide LiTFSI accounts for 20% of its mass fraction; graphite phase carbon nitride g-C 3 N 4 The mass fraction is 1%, and the amount of acetonitrile added is such that polyethylene oxide PEO, lithium bistrifluoromethanesulfonimide LiTFSI and graphite phase carbon nitride g-C can be completely dissolved. 3 N 4 A mixture of the three...

Embodiment 3

[0047] This embodiment includes the following steps:

[0048] (1) Add urea to a quartz crucible, and heat it under an air atmosphere at 600 degrees Celsius for 2 hours to obtain graphite-phase carbon nitride g-C with a thinner sheet thickness. 3 N 4 , where the heating rate was 5°C / min.

[0049] (2) the graphite phase carbon nitride g-C prepared in the step (1) 3 N 4 , polyvinylidene fluoride PVDF, and lithium bistrifluoromethanesulfonimide LiTFSI are mixed, and then acetonitrile is added and stirred until the system is uniform to obtain a mixed solution.

[0050] Based on the mass of polyvinylidene fluoride, lithium bistrifluoromethanesulfonimide LiTFSI accounts for 5% of its mass fraction, graphite phase carbon nitride g-C 3 N 4 Accounting for 10% of its mass fraction, the amount of acetonitrile added is enough to completely dissolve polyvinylidene fluoride, lithium bistrifluoromethanesulfonimide LiTFSI and graphite phase carbon nitride g-C 3 N 4 A mixture of the thre...

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Abstract

The invention discloses a preparation method of composite solid polymer electrolyte. The method comprises the following steps: (1) heating up a nitrogen carbon precursor to obtain graphite phase carbon nitride g-C3N4 through preparation; (2) mixing the graphite phase carbon nitride g-C3N4 obtained in the step (1), polymer and LiTFSI together, then, adding acetonitrile, stirring until that the system is even, and obtaining mixed liquor; (3) drying the mixed liquor obtained in the step (2) to obtain a self-supported composite solid electrolyte membrane. In the method provided by the invention, the graphite phase carbon nitride is mixed with the polymer, the composite polymer solid electrolyte is prepared through a simple solvent volatilization process, and the composite polymer solid electrolyte is applied to an all-solid-state lithium ion battery. The method provided by the invention has the characteristics of being simple in preparation, being expandable, and using raw materials whichare cheap.

Description

technical field [0001] The invention belongs to the technical field of preparation of polymer solid electrolytes, in particular to a preparation method of a composite solid polymer electrolyte composed of inorganic materials and polymers. Background technique [0002] As the most widely used electrochemical energy storage device in today's society, lithium-ion batteries have many advantages such as high output voltage, high specific energy, high charge and discharge efficiency, and long cycle life. However, currently lithium-ion batteries use low-boiling, flammable organic electrolytes. Once the battery is exposed to high temperature or is impacted, the leakage and combustion of the liquid electrolyte will cause serious consequences. Solid polymer electrolytes completely rely on the migration of lithium ions in polymers to achieve ion transport, thus improving battery safety performance, and are considered promising for practical applications in the future due to their good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCY02E60/10
Inventor 丁书江孙宗杰
Owner XI AN JIAOTONG UNIV
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