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Flexible all-solid-state battery and its preparation method

An all-solid-state battery, solid-state electrolyte technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc. Will drop, good anti-stretch effect

Active Publication Date: 2020-06-12
柔电(武汉)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a flexible all-solid-state battery and its preparation method, aiming to solve the problem of poor flexibility of the existing all-solid-state batteries

Method used

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  • Flexible all-solid-state battery and its preparation method
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  • Flexible all-solid-state battery and its preparation method

Examples

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preparation example Construction

[0037] The present invention also provides a preparation method of a flexible all-solid-state battery, comprising the following steps:

[0038] (1) Mix and stir the positive active material, conductive adhesive, binder, first solid electrolyte, first cellulose matrix and solvent to form a uniformly dispersed slurry, and pour the obtained slurry into a suction filter with filter paper In the device, a membrane is formed by filtration, and a flexible positive electrode sheet is prepared.

[0039] (2) Mix and stir the negative electrode active material, the conductive adhesive, the binder, the first solid electrolyte, the first cellulose matrix and the solvent to form a uniformly dispersed slurry, and pour the obtained slurry into a suction filter with filter paper In the device, a membrane is formed by filtration to prepare a flexible negative electrode sheet;

[0040] (3) Fully mix and disperse the second solid electrolyte in the solvent at a high speed, and then add the secon...

Embodiment 1

[0049] (1) Put the active material graphite raw material, conductive agent carbon nanotubes, solid electrolyte polyethylene oxide, and nanocellulose matrix into isopropanol solvent in a mass ratio of 87:3:5:5, Stir at a high speed for 15 minutes at room temperature to obtain a viscous slurry, pour the obtained viscous slurry into a suction filtration device with filter paper, filter to form a film, and vacuum dry for 8 hours at a temperature of 130° to obtain a flexible negative electrode After rolling the dried flexible negative electrode sheet on a roller press, a flexible negative electrode sheet with a thickness of 100 microns was obtained.

[0050] The flexible negative electrode sheet obtained in this example is as follows figure 1 As shown, the pole pieces are very flexible and can be bent repeatedly without breaking. figure 2 The electron microscope images of the flexible negative sheet before and after rolling. It can be seen from the figure that the active material...

Embodiment 2

[0056] (1) The active material lithium cobalt oxide raw material, conductive agent carbon nanotubes, solid electrolyte Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 The three substances were put into the isopropanol solvent in a mass ratio of 92:3:5, stirred at a high speed for 10min at room temperature to form a uniformly dispersed suspension, and the fully dispersed cellulose base solution was added to the suspension. , the cellulose accounts for 8% of the entire pole piece, stir again at high speed for 5 minutes to obtain a viscous slurry, pour the obtained viscous slurry into a suction filtration device with filter paper, filter to form a film, and at a temperature of 120 °. , vacuum dried for 12 hours to obtain a flexible positive electrode sheet, and after the dried flexible positive electrode sheet was rolled on a roller press, a flexible positive electrode sheet with a thickness of 110 microns was obtained.

[0057] The flexible positive electrode sheet obtained in this example i...

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Abstract

The invention provides a flexible all-solid-state battery and a preparation method thereof. The flexible all-solid-state battery comprises a flexible positive pole plate, a solid-state electrolyte membrane and a flexible negative pole plate which are sequentially laminated, the flexible positive pole plate and the flexible negative pole plate respectively comprises a first cellulose matrix, an active substance, a conductive agent and a first solid-state electrolyte, the active substance and the conducive agent are dispersed in the first cellulose matrix, and the solid-state electrolyte membrane comprises a second solid-state electrolyte and a second cellulose matrix. The cellulose matrixes are added into both of the flexible positive pole plate and the flexible negative pole plate, and aneffect of meshed and integrated support can be achieved; the solid-state electrolytes are arranged into both of the flexible positive pole plate and the flexible negative pole plate, and thus, an effect of improving ion conduction can be achieved; the cellulose matrix is also added into the solid-state electrolyte membrane, and a favorable network-shaped structure can be formed; and moreover, thecellulose molecule chain has a good stretching resistant effect, so that the solid-state electrolyte membrane has favorable flexibility and toughness.

Description

technical field [0001] The invention relates to the field of solid-state batteries, in particular to a flexible all-solid-state battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used due to their many important advantages such as high voltage and high capacity, as well as long cycle life, high open circuit voltage, and no memory effect. However, traditional liquid lithium-ion batteries contain a large amount of organic electrolytes, which are volatile, flammable, and explosive, and cause major safety hazards. Therefore, the use of solid electrolytes instead of electrolytes to develop all-solid-state batteries is the fundamental way to solve battery safety problems. Compared with liquid electrolyte batteries, all-solid-state batteries have a larger space for development in terms of improving energy density, broadening the operating temperature range, and extending service life. Solid-state electrolyte batteries al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M4/80H01M10/0562H01M10/0565
CPCY02E60/10
Inventor 熊红波胡韬解明
Owner 柔电(武汉)科技有限公司
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