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Solid-state polymer electrolyte membrane with grid structure, and preparation method thereof

A solid polymer, grid structure technology, used in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of poor electrochemical performance and mechanical properties of solid polymer electrolyte membranes, and improve electrochemical stability. The effect of improving and reducing the deformation of the high elastic amorphous region

Inactive Publication Date: 2021-01-22
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the technical problems of poor electrochemical performance and mechanical performance of the current solid polymer electrolyte membrane, the present invention provides a solid polymer electrolyte membrane with a horizontally and vertically oriented grid structure and a preparation method thereof

Method used

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  • Solid-state polymer electrolyte membrane with grid structure, and preparation method thereof
  • Solid-state polymer electrolyte membrane with grid structure, and preparation method thereof
  • Solid-state polymer electrolyte membrane with grid structure, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0042] A preparation method of a lithium-ion battery solid polymer electrolyte membrane with a grid structure, comprising the following steps:

[0043] Raw material preparation: PEO as polymer matrix, LiClO 4 As lithium salt, SiO 2 Nanoparticles (hydrophilic) as inert fillers;

[0044] (1) SiO with an addition amount of 6.85wt% 2 Nanoparticles were added into acetonitrile solvent, magnetically stirred for 0.5h, and then ultrasonically dispersed for 1h to dissolve the SiO 2 Uniformly dispersed in the solvent, followed by PEO and LiClO 4 According to the ratio of the amount of substance, it is n(EO):n(LiClO 4 )=12:1 is dissolved in the acetonitrile solvent, the mass fraction of PEO is 4.7wt%, magnetic stirring 12h, obtains the solid electrolyte precursor namely spinning solution;

[0045] (2) Electrospin the spinning solution obtained in (1) onto the receiver (the receiver is a flat grid structure, and the distance between the grid nodes is 50 mm) under electrostatic high v...

Embodiment 2

[0056] Raw material preparation: PEO as polymer matrix, LiClO 4 As lithium salt, SiO 2 Nanoparticles (hydrophilic) as inert fillers;

[0057] (1) SiO with an addition amount of 6.85wt% 2 Nanoparticles were added into acetonitrile solvent, magnetically stirred for 0.5h, and then ultrasonically dispersed for 1h to dissolve the SiO 2 Uniformly dispersed in the solvent, followed by PEO and LiClO 4 According to the molar ratio of substances, it is nEO:nLiClO 4 =12:1 dissolved in acetonitrile solvent, the mass fraction of PEO is 4.7wt%, magnetically stirred for 12h, to obtain the solid electrolyte precursor that is the spinning solution;

[0058] (2) Electrospin the spinning solution obtained in (1) onto the receiver (the receiver is a flat grid structure, and the distance between the grid nodes is 50 mm) under electrostatic high voltage. The parameters of the equipment are to prepare a solid polymer electrolyte membrane, and vacuum-dry the obtained solid polymer electrolyte me...

Embodiment 3

[0063] A preparation method of a lithium-ion battery solid polymer electrolyte membrane with a grid structure, comprising the following steps:

[0064] Raw material preparation: According to Table 1, select the corresponding inert filler, organic solvent, polymer matrix and lithium salt in sequence;

[0065] (1) Add the hydrophilic inert filler with an addition amount of 8wt% to the organic solvent, disperse the inert filler in the organic solvent by ultrasonic dispersion for 4 hours after magnetic stirring for 2 hours, and then mix the polymer matrix and lithium salt according to the amount of the substance Dissolved in an organic solvent with a ratio of 8:1, the mass fraction of the polymer matrix is ​​4.7wt%, and magnetically stirred for 18 hours to obtain a solid electrolyte precursor, that is, a spinning solution;

[0066] (2) Electrospin the spinning solution obtained in step (1) onto the receiver under electrostatic high voltage, and prepare a solid polymer electrolyte ...

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Abstract

The invention relates to a solid-state polymer electrolyte membrane with a grid structure, and a preparation method of the solid-state polymer electrolyte membrane. The method comprises the followingsteps: (1) uniformly dispersing an inert filler into an organic solvent to obtain a mixed solution; (2) dissolving a polymer matrix and a lithium salt into the mixed solution obtained in the step (1),and uniformly mixing to obtain a spinning solution; (3) performing electrostatic spinning on the spinning solution under electrostatic high voltage to a receiver to obtain a solid-state polymer electrolyte membrane, wherein the receiver is of a flat-plate-shaped grid structure, the distance between every two adjacent nodes in a grid ranges from 1 mm to 100 mm, the prepared solid-state polymer electrolyte membrane is a nanofiber membrane in which nanofibers are orderly arranged in the transverse direction and the longitudinal direction, the nanofiber membrane is of a tabulate grid structure, the average value of the distances between adjacent nodes in the tabulate grid structure is 0-300 nm, the deviation is 0-30 nm, the crystallinity of the solid-state polymer electrolyte membrane is 10-70%, the tensile strength is 0.01-50 MPa, and the ionic conductivity at room temperature is 1*10<-5> S.cm<-1>-1*10<-3> S.cm<-1>.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a grid-structured solid polymer electrolyte membrane and a preparation method thereof. Background technique [0002] All-solid-state lithium-ion batteries are one of the important development directions of next-generation lithium-ion batteries. As the core component of all-solid-state lithium-ion batteries, solid-state electrolytes play the dual role of conducting ions and isolating electrons. Using solid-state electrolytes instead of liquid electrolytes can greatly solve the safety problem of liquid-state lithium-ion batteries. Among them, the polymer electrolyte should have the characteristics of good compatibility with lithium salts, stable electrochemical performance and excellent safety performance, which is one of the current research hotspots of all-solid-state electrolytes. However, the solid polymer electrolytes prepared by traditional casting and hot-pressi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525D04H1/728D04H1/4326D04H1/413D01F6/94D01F1/10B82Y40/00B82Y30/00
CPCH01M10/0565H01M10/058H01M10/0525D04H1/728D04H1/413D04H1/4326D01F6/94D01F1/10B82Y30/00B82Y40/00H01M2300/0091Y02E60/10Y02P70/50
Inventor 雷茹燕李军杨燕平余宸娟徐银丝
Owner SHANGHAI UNIV OF ENG SCI
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