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Quasi-solid electrolyte for protecting lithium negative electrode and preparation method thereof

A liquid electrolyte and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as unfavorable large-scale production, thin alumina coating, liquid electrolyte leakage, etc., and achieve good thermal stability and chemical stability. Stability, inhibition of lithium dendrite generation, effect of wide electrochemical stability window

Inactive Publication Date: 2019-04-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems in this method, such as liquid electrolyte leakage and flammable and explosive safety hazards; the commonly used atomic layer deposition (ALD) preparation process is complicated and expensive, which is not conducive to large-scale production; The cladding layer is thin and cannot provide protection for a long time, etc., so it is necessary to invent a safe and reliable electrolyte material with simple preparation methods

Method used

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  • Quasi-solid electrolyte for protecting lithium negative electrode and preparation method thereof
  • Quasi-solid electrolyte for protecting lithium negative electrode and preparation method thereof
  • Quasi-solid electrolyte for protecting lithium negative electrode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] (1) In a glove box filled with a protective gas with a purity greater than or equal to 99% argon and a moisture content of less than 1ppm, add 0.41g of lithium bistrifluoromethanesulfonimide to 2.00g of N-methyl, propylpyrrolidine Stir in the bistrifluoromethanesulfonimide salt for 24 hours to obtain a uniform and transparent liquid electrolyte; add 2.00ml of aluminum sec-butoxide to the liquid electrolyte and stir for 3 minutes to obtain a milky white uniform thick liquid; finally add 2.00ml of formic acid and stir to make Mix them evenly to obtain a reaction system;

[0036] (2) Allow the reaction system to stand in the glove box for 48 hours, then remove it and place it in a vacuum drying oven with a relative vacuum of -80KPa, and dry it at 80°C for 5 days to obtain a reaction system according to the present invention. Quasi-solid electrolytes for lithium anode protection.

[0037] A kind of quasi-solid electrolyte used for lithium negative electrode protection prep...

Embodiment 2

[0043] (1) In a glove box filled with a protective gas with a purity greater than or equal to 99% argon and a moisture content of less than 1ppm, add 0.41g of lithium bistrifluoromethanesulfonimide to 2.00g of N-methyl, propylpyrrolidine Stir in the bistrifluoromethanesulfonimide salt for 24 hours to obtain a uniform and transparent liquid electrolyte; add 2.50ml of aluminum sec-butoxide to the liquid electrolyte and stir for 3 minutes to obtain a milky white uniform thick liquid; finally add 2.85ml of formic acid and stir to make Mix them evenly to obtain a reaction system;

[0044] (2) Allow the reaction system to stand in the glove box for 48 hours, then remove it and place it in a vacuum drying oven with a relative vacuum of -80KPa, and dry it at 80°C for 5 days to obtain a reaction system according to the present invention. Quasi-solid electrolytes for lithium anode protection.

[0045] A kind of quasi-solid electrolyte used for lithium negative electrode protection prep...

Embodiment 3

[0051] (1) In a glove box filled with a protective gas with a purity greater than or equal to 99% argon and a moisture content of less than 1ppm, add 0.41g of lithium bistrifluoromethanesulfonimide to 2.00g of N-methyl, propylpyrrolidine Stir in the bistrifluoromethanesulfonimide salt for 24 hours to obtain a uniform and transparent liquid electrolyte; add 3.00ml aluminum sec-butoxide to the liquid electrolyte and stir for 3 minutes to obtain a milky white uniform thick liquid; finally add 3.50ml formic acid and stir to make Mix them evenly to obtain a reaction system;

[0052] (2) Let the reaction system stand still in the glove box for 48h, then remove it and place it in a vacuum oven with a relative vacuum of -80KPa, and dry it at 80°C for 5d to obtain a compound for use in the present invention. A quasi-solid electrolyte for lithium anode protection.

[0053] A kind of quasi-solid electrolyte used for lithium negative electrode protection prepared in this example is teste...

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Abstract

The invention relates to a quasi-solid electrolyte for protecting a lithium negative electrode and a preparation method of the quasi-solid electrolyte, and belongs to the technical field of lithium metal battery electrolytes. The electrolyte is a porous network structure prepared from a lithium salt, an ionic liquid, an aluminum precursor and a catalyst through sol-gel reaction. An aluminum oxideframework of the porous network structure serves as a supporting structure, and liquid electrolyte composed of lithium salt and ionic liquid is adsorbed in the framework. The preparation method comprises the following steps: adding a lithium salt into an ionic liquid in a near-oxygen-free and water-free environment, stirring to be transparent, adding an aluminum precursor, stirring to obtain a milky white uniform thick liquid, adding a catalyst, and uniformly stirring; standing for 24 to 72h in a nearly oxygen-free and water-free environment, moving out and placing in a vacuum of -70 KPa to -100KPa, and drying at 60-90 DEG C for 4-6 days to obtain the electrolyte. The electrolyte has high ionic conductivity, a wide electrochemical stability window and good thermal and chemical stability; and the lithium-ion battery has super-strong lithium affinity and is beneficial to protection of a lithium negative electrode.

Description

technical field [0001] The invention relates to a quasi-solid electrolyte used for lithium negative electrode protection and a preparation method thereof, belonging to the technical field of lithium metal battery electrolytes. Background technique [0002] With the rapid development of society, people's demand for energy is increasing, which will undoubtedly bring about global environmental degradation and energy depletion. Lithium metal batteries have high energy density and less environmental pollution, making them excellent candidates for next-generation energy storage devices. However, the instability of lithium metal anodes limits their application in various portable electronic products. [0003] In response to this problem, researchers have done a lot of work on the protection of lithium anodes, and coating lithium anodes with inert metal oxides is one of them. Alumina has good lithium affinity, and can be deposited uniformly on the surface of the lithium negative el...

Claims

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Application Information

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IPC IPC(8): H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0568Y02E60/10
Inventor 陈人杰李月姣温子越屈雯洁陈楠闫明霞李丽吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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