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Composite electrolyte material with electrochemical buffer layer, preparation method thereof and lithium metal battery

A composite electrolyte and electrochemical technology, applied in the field of lithium-ion batteries, can solve problems such as difficult to meet energy density cycle performance, poor interface contact, and chemical instability of lithium metal

Inactive Publication Date: 2021-04-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the application of ceramic / polymer composite electrolyte materials
On the one hand, the interface contact between the ceramic / polymer composite electrolyte material and the electrode is poor, and the charge transfer resistance is high; on the other hand, the polymer component in the ceramic / polymer composite electrolyte material is difficult to withstand high voltage and Low voltage, and ceramic-structured electrolyte components may be chemically unstable to lithium metal
Therefore, it is difficult for ceramic / polymer composite electrolyte materials to meet the requirements of higher energy density and better cycle performance.

Method used

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  • Composite electrolyte material with electrochemical buffer layer, preparation method thereof and lithium metal battery

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preparation example Construction

[0152] The present invention also provides a method for preparing a composite electrolyte material with an electrochemical buffer layer described in the above technical solution, comprising the following steps:

[0153] a) mixing polymer A, lithium salt and solvent to obtain positive electrode electrochemical buffer layer slurry;

[0154] mixing polymer B, lithium salt and solvent to obtain negative electrode electrochemical buffer layer slurry;

[0155] Mixing polymer C, ceramic electrolyte, lithium salt and solvent to obtain composite electrolyte interlayer slurry;

[0156] b) The positive electrode electrochemical buffer layer slurry, the composite electrolyte intermediate layer slurry and the negative electrode electrochemical buffer layer slurry are sequentially stacked and dried to obtain a composite electrolyte material with an electrochemical buffer layer.

[0157] The types and dosages of the polymer A, polymer B, polymer C, lithium salt and ceramic electrolyte are c...

Embodiment 1

[0170] 1.1 Sample preparation

[0171] S1, 70 parts of polyvinylidene fluoride, 30 parts of LiN(CF 3 SO 2 ) 2 1000 parts of N,N-dimethylformamide were mixed at 50° C. for 6 hours by mechanical stirring to obtain a positive electrode electrochemical buffer layer slurry.

[0172] S2, 80 parts of polyethylene oxide, 20 parts of LiN(CF 3 SO 2 ) 2 1000 parts of acetonitrile were mixed by mechanical stirring at room temperature for 6 hours to obtain the negative electrode electrochemical buffer layer slurry.

[0173] S3. At room temperature, the ceramic electrolyte Li 10 GeP 2 S 12 Grind to particles with an average particle size of 320 nm. Under the protection of argon atmosphere, 30 parts of polyvinylidene fluoride, 15 parts of LiN(CF 3 SO 2 ) 2 , 55 Li 10 GeP 2 S 12 The nanoparticles and 400 parts of N,N-dimethylformamide were mixed at room temperature for 6 hours by a high-energy ball mill to obtain a composite electrolyte interlayer slurry.

[0174] S4. Scrape-c...

Embodiment 2

[0184] 1.1 Sample preparation

[0185] S1, 80 parts of polymethacrylate, 20 parts of LiN(FSO 2 ) 21000 parts of N,N-dimethylformamide were mixed at 50° C. for 6 hours by high-energy ball milling to obtain a positive electrode electrochemical buffer layer slurry.

[0186] S2, 70 parts of polyethylene oxide, 30 parts of LiN(CF 3 SO 2 ) 2 1000 parts of acetonitrile were mixed at room temperature for 6 hours by high-energy ball milling to obtain the negative electrode electrochemical buffer layer slurry.

[0187] S3. At room temperature, the ceramic electrolyte Li 7 La 3 Zr 2 o 12 Grind to particles with an average particle size of 400 nm. Under the protection of argon atmosphere, 20 parts of polyethylene oxide, 5 parts of LiN(FSO 2 ) 2 , 75 Li 7 La 3 Zr 2 o 12 The nanoparticles and 400 parts of acetonitrile were mixed for 6 hours at room temperature by a roller mill to obtain a composite electrolyte interlayer slurry.

[0188] S4. Squeeze-coat the positive electro...

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Abstract

The invention provides a composite electrolyte material with an electrochemical buffer layer, a preparation method of the composite electrolyte material and a lithium metal battery. The composite electrolyte material with the electrochemical buffer layer comprises a three-layer structure, and the two sides of the ceramic polymer composite electrolyte are respectively provided with a specific positive electrode electrochemical buffer layer and a negative electrode electrochemical buffer layer, so that the interface contact between the ceramic polymer composite electrolyte material and an electrode can be effectively improved; the charge transfer impedance is reduced; meanwhile, the buffer layers on the two sides can also improve the tolerance to high and low pressure, play an electrochemical buffer role, stabilize an electrode / electrolyte interface, generate better chemical stability and reach a wider electrochemical window.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a composite electrolyte material with an electrochemical buffer layer, a preparation method thereof and a lithium metal battery. Background technique [0002] Due to its high energy density and good cycle performance, lithium-ion batteries have been widely used in people's production and life. Commercial lithium-ion batteries mainly use organic liquids as electrolytes, but organic liquids are easy to leak and are flammable, which may have certain safety hazards; in addition, organic liquids are not stable enough for lithium metal, and lithium dendrites are easy to form during cycling. The application of lithium metal as a negative electrode is limited, so it is difficult to substantially improve the overall performance of lithium-ion batteries. Replacing the organic liquid electrolyte with a solid electrolyte can effectively improve the safety of the battery and inhibit the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525
CPCH01M10/0562H01M10/0565H01M10/0525H01M2300/0094Y02E60/10
Inventor 姚霞银徐芳林
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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