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Polymer solid electrolyte and preparation method and application thereof

A solid electrolyte, solid electrolyte technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of difficult processing, hard solid electrolyte of inorganic compounds, large electrode contact interface impedance, etc., to achieve rapid response, Improve battery performance and avoid pollution

Pending Publication Date: 2020-04-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods can only improve the Li / CF x Part of the performance of the battery, and there are certain limitations, can not be universally applicable
[0005] Current Li / CF x The solid electrolyte layers used in batteries are mainly divided into inorganic compound solid electrolytes and polymer solid electrolytes. Although they can solve the safety hazards of organic electrolytes, there are still common problems such as low room temperature conductivity, unstable cycle performance, and preparation methods. Complicated, not suitable for processing, not conducive to large-scale production and other issues
Among them, inorganic compound solid-state electrolytes are hard, brittle, inelastic, have high interface resistance with electrodes, and are not easy to process. At present, they cannot be produced on a large scale and are difficult to commercialize.
For polymer solid electrolytes, although they have good processability and good compatibility with electrodes, they generally adopt ultraviolet light polymerization, and additional photoinitiators need to be added to generate free radicals, which have a high Crystalline phase, limited solvency and poor chain scission ability, resulting in low conductivity, which cannot meet the needs of practical applications

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  • Polymer solid electrolyte and preparation method and application thereof
  • Polymer solid electrolyte and preparation method and application thereof
  • Polymer solid electrolyte and preparation method and application thereof

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preparation example Construction

[0039] Preparation of precursor solution. Lithium bistrifluoromethanesulfonimide is dissolved in a polymer containing ethylene oxide chain (EO) and stirred vigorously at room temperature to obtain a uniform precursor solution. The concentration of the obtained precursor solution can be 1-3 mol / L.

[0040] Pour a certain volume of precursor solution (the poured volume is the product of the bottom surface of the mold and the required thickness (1-100μm)) on the solid electrolyte template (for example, polytetrafluoroethylene template, polyethylene, polysulfone, polypropylene, etc.) It is then transferred to an electron beam irradiation source for in-situ polymerization and curing to obtain a polymer solid electrolyte. Wherein, the irradiation intensity of the electron beam irradiation source used may be 2.5-300 keV, and the irradiation time may be 1-100s, preferably 10-20s.

[0041] In one embodiment of the present invention, the above-mentioned polymer solid electrolyte is used to...

Embodiment 1

[0049] Li / CF x The preparation of the battery includes the following steps:

[0050] (1) Lithium bistrifluoromethanesulfonimide (LiTFSI, 99.95%) and polyethylene glycol methyl methacrylate (PEGDMA, M w =480g / mol) as the raw material. Before use, the LiTFSI was dried in a vacuum at 110°C for 24 hours. After the PEGDMA was detected by the proton nuclear magnetic resonance spectrum, it was dried with a molecular sieve;

[0051] (2) CF x (x=0.8-1) The powder, conductive carbon black, and polyvinylidene fluoride powder are added to the N-methylpyrrolidone (NMP) solution according to a certain mass ratio (90:5:5), and mixed by ball milling at 150 rpm 10 hours to obtain slurry;

[0052] (3) Spread the slurry using the casting method, then dry and cut the pieces to make the positive pole piece (thickness 0.5mm);

[0053] (4) Use a mold to cut a metal lithium negative plate (thickness 0.2mm) with a certain area as the negative electrode;

[0054] (5) Dissolve LiTFSI in PEGDMA liquid and stir v...

Embodiment 2

[0061] Li / CF x The preparation of the battery includes the following steps:

[0062] (1) Lithium bistrifluoromethanesulfonimide (LiTFSI, 99.95%) and polyethylene glycol methyl methacrylate (PEGDMA, Mw=480g / mol) are used as raw materials. Before use, the LiTFSI was dried in a vacuum at 110°C for 24 hours. After the PEGDMA was detected by the proton nuclear magnetic resonance spectrum, it was dried with a molecular sieve;

[0063] (2) CF x (x=0.8-1) The powder, conductive carbon black, and polyvinylidene fluoride powder are added to the N-methylpyrrolidone (NMP) solution according to a certain mass ratio (90:5:5), and mixed by ball milling at 300 rpm 15 hours to obtain slurry;

[0064] (3) Spread the slurry using the casting method, then dry and cut the pieces to make the positive pole piece (thickness 0.5mm);

[0065] (4) Use a mold to cut a metal lithium negative plate (thickness 0.2mm) with a certain area as the negative electrode;

[0066] (5) Dissolve LiTFSI in PEGDMA liquid and st...

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Abstract

The invention relates to a polymer solid electrolyte as well as a preparation method and application thereof, and the preparation method of the polymer solid electrolyte comprises the following steps:(1) dissolving lithium bis (trifluoromethanesulfonyl) imide LiTFSI or / and lithium bis (pentafluoroethane sulfonyl) imide in a polymer containing an ethylene oxide chain to obtain a precursor solution; and (2) pouring the obtained precursor solution on a solid electrolyte template, and then carrying out in-situ polymerization curing under an electron beam irradiation source to obtain the polymer solid electrolyte, wherein the intensity of the electron beam irradiation source is 25-300keV, and the irradiation time is 1-100 seconds.

Description

Technical field [0001] The invention relates to a polymer solid electrolyte and a preparation method and application thereof, in particular to a polymer solid electrolyte, a preparation method and application in a lithium-carbon fluoride battery, and belongs to the technical field of lithium batteries. Background technique [0002] Lithium-ion batteries are currently one of the most commonly used energy storage technologies and are widely used in electronic products, electric vehicles, and energy storage systems. Due to the low energy density of traditional lithium-ion batteries and the difficulty of large-scale structure, it hinders their further application in emerging technologies such as electric vehicles and smart grids. Lithium-Fluorocarbon (Li-CF x )Battery is a kind of carbon fluoride (CF x ) Lithium battery as a positive electrode material has the highest theoretical mass specific energy of 2180W·h / kg in the solid positive electrode system, and has a great potential for ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0085Y02E60/10
Inventor 李文荣戴扬朱德伦李爱军
Owner SHANGHAI UNIV