Solid polymer electrolyte, preparation method thereof and lithium ion battery

A solid polymer and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of high polarity on the surface of inorganic nanoparticles, affecting the performance of polymer electrolytes, and the decline in ionic conductivity, so as to inhibit dendrites Growth, avoiding battery short circuit, and improving ion conductivity

Active Publication Date: 2019-01-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the amount of inorganic particles is excessive, the inorganic particles aggregate and separate from the polymer matrix, which has a negative effect and the ionic conductivity decreases.
Moreover, the surface polarity of inorganic nanoparticles is very large, it is easy to agglomerate, and it is difficult to mix evenly with polymers. This feature seriously affects the performance of nanoparticles to improve polymer electrolytes.

Method used

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  • Solid polymer electrolyte, preparation method thereof and lithium ion battery
  • Solid polymer electrolyte, preparation method thereof and lithium ion battery
  • Solid polymer electrolyte, preparation method thereof and lithium ion battery

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[0053] The present invention also provides a method for preparing a solid polymer electrolyte, comprising the following steps:

[0054] A) Ultrasonic treatment of the graphene oxide solution, and suction filtration to obtain a three-dimensional graphene oxide film;

[0055] B) freeze-drying the three-dimensional graphene oxide film;

[0056] C) drop-coating a mixed solution of a lithium salt electrolyte and a polymer onto the freeze-dried three-dimensional graphene oxide film, and drying in a vacuum to obtain a solid polymer electrolyte;

[0057] The polymer is one or more of PEO, PAN, PVDF, PMMA and PVDF-HFP;

[0058] The lithium salt electrolyte is LiTFSI, LiPF 6 、LiCIO 4 one or more of

[0059] The polymer has electron-donating functional groups, and the molar ratio of the electron-donating functional groups to lithium ions in the lithium salt is (1-10):1.

[0060] In the present invention, the graphene oxide solution is preferably ultrasonically treated, and then a mo...

Embodiment 1

[0078] 50 mL of graphene oxide solution with a concentration of 1 mg / mL was sonicated for 1 h, and 10 mL of the solution was suction-filtered to form a three-dimensional graphene oxide film (thickness: 50 μm), which was taken out and freeze-dried at -100°C for 48 h.

[0079] Take 0.1625g of LiTFSI (lithium bistrifluoromethanesulfonylimide), add it into 5mL of acetonitrile solution and stir to dissolve, then add 0.2g of PEO (polyethylene oxide) into the above mixed solution and stir for 6h until completely dissolved to obtain solution A (where EO:Li=2:1).

[0080] The three-dimensional graphene oxide was cut into sheets with a diameter of 20 mm, arranged on a PET substrate, and the obtained solution A was drip-coated on the graphene oxide film, and vacuum-dried for 24 hours to obtain a solid polymer electrolyte membrane.

[0081] The prepared polymer electrolytes were assembled into half cells for performance testing.

[0082] figure 1 It is the SEM picture of the three-dimen...

Embodiment 2

[0087] Sonicate 50 mL of graphene oxide solution with a concentration of 1 mg / mL for 1 h, then add 5 g of polyethylene glycol n-hexadecyl ether, stir for 2 h, take 5 mL of the solution and suction filter it into a three-dimensional oxide film (thickness 50 μm), take it out and freeze-dry it. The temperature is -100°C, and the time is 48h.

[0088] Take 0.1625g of LiTFSI (lithium bistrifluoromethanesulfonylimide), add it into 5mL of acetonitrile solution and stir to dissolve, then add 0.1g of PEO (polyethylene oxide) into the above mixed solution and stir for 6h until completely dissolved to obtain solution A (where EO:Li=4:1).

[0089] The prepared three-dimensional graphene oxide membrane was cut into sheets with a diameter of 20 mm, arranged on a PET substrate, and the obtained solution A was drip-coated on the graphene oxide membrane, and dried in vacuum for 24 hours to obtain a solid polymer electrolyte membrane.

[0090]The prepared polymer electrolyte was removed from t...

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Abstract

The invention provides a solid polymer electrolyte comprising a three-dimensional graphene oxide network and a polymer and lithium salt electrolyte filled in the three-dimensional graphene oxide network; The polymer is one or more of PEO, PAN, PVDF, PMMA and PVDF-HFPs; The lithium salt electrolyte is one or more of LiTFSI, LiPF6 and LiCIO4; The polymer has an electron donating functional group, and the molar ratio of the electron donating functional group to lithium ions in the lithium salt is (1-10): 1. The three-dimensional graphene oxide network surface of the invention can form a continuous amorphous region, which is favorable for lithium ion transmission and improves the ionic conductivity of the solid polymer electrolyte. The prepared polymer electrolyte has high ionic conductivity,good mechanical strength and excellent safety performance. The invention also provides a preparation method of a solid polymer electrolyte and a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a solid polymer electrolyte, a preparation method thereof and a lithium ion battery. Background technique [0002] The emergence of solid polymer electrolytes has fundamentally solved the leakage problem of liquid organic electrolyte lithium-ion batteries. Lithium-ion batteries assembled with solid polymer electrolytes have the advantages of high energy density, long cycle life, can be processed into arbitrary shapes, and are relatively safe and reliable. The problem of lithium dendrites generated in the process. Therefore, solid polymer electrolytes are ideal candidates to replace liquid electrolytes in the future. [0003] However, the most prominent problem of solid polymer electrolytes is the low ionic conductivity, which cannot meet the needs of practical applications. Solid polymer electrolytes use organic polymers as the main matrix, and ion tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565Y02E60/10
Inventor 梁珊珊邓伟赵斐周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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