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Solid-state battery and preparation method and application thereof

A solid-state battery, solid-state electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of poor cycle performance of solid-state batteries, and achieve the effect of excellent cycle stability performance

Pending Publication Date: 2022-07-29
河北光兴半导体技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of poor cycle performance of solid-state batteries in the prior art

Method used

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  • Solid-state battery and preparation method and application thereof

Examples

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preparation example Construction

[0062] The present invention has no special requirements on the preparation method of the positive electrode sheet and the negative electrode sheet, and can be prepared by methods known in the art.

[0063] The present invention has no special requirements on the preparation method of the battery core, which can be carried out by a method known in the art, for example, it can be prepared by a lamination or winding method.

[0064] In the present invention, the electrolyte is solidified during the chemical conversion process, that is, the chemical conversion conditions at least include: a vacuum degree of 0.8-2MPa, a temperature of 80-120°C, and a time of 12-30h. The inventors found that by adopting the specific embodiment in this preferred case, the prepared solid-state battery has more excellent cycle stability.

[0065] According to a particularly preferred embodiment, in step (3), the second solvent is ethanol.

[0066] Preferably, in step (3), the amount of the second sol...

Embodiment 1

[0079] This embodiment provides a method for preparing a solid-state battery, comprising the following steps:

[0080] (1) the solid electrolyte (the amount of solid electrolyte is 5g), the binder and the lithium salt are dissolved in the first solvent according to the mass ratio of 1:0.5:0.1, and the first contact mixing is carried out to obtain the first mixed solution, and Casting the first mixed solution in a polytetrafluoroethylene circular mold for drying to obtain a solid electrolyte membrane with an average thickness of 100 μm;

[0081] Wherein, the conditions of the first contact mixing are: the stirring speed is 300rpm, the temperature is room temperature, and the time is 8h;

[0082] The conditions of drying treatment are: the vacuum degree is negative pressure 100Pa, the temperature is 100℃, and the time is 24h;

[0083] (2) Stack the positive electrode sheet, the solid electrolyte membrane, and the negative electrode sheet in turn, and weld the tabs, and wind the...

Embodiment 2

[0088] This embodiment provides a method for preparing a solid-state battery, comprising the following steps:

[0089] (1) the solid electrolyte (the amount of solid electrolyte is 5g), the binder and the lithium salt are dissolved in the first solvent according to the mass ratio of 1:0.6:0.2, and the first contact mixing is carried out to obtain the first mixed solution, and Casting the first mixed solution in a polytetrafluoroethylene circular mold for drying to obtain a solid electrolyte membrane with an average thickness of 100 μm;

[0090] Wherein, the conditions of the first contact mixing are: the stirring speed is 300rpm, the temperature is room temperature, and the time is 8h;

[0091] The conditions of drying treatment are: the vacuum degree is negative pressure 300Pa, the temperature is 100℃, and the time is 24h;

[0092] (2) Stack the positive electrode sheet, the solid electrolyte membrane, and the negative electrode sheet in turn, and weld the tabs, and wind the...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a solid-state battery and a preparation method and application thereof. The solid-state battery comprises stacked battery cells, and each battery cell comprises a positive electrode, a negative electrode and a composite electrolyte arranged between the positive electrode and the negative electrode; the composite electrolyte comprises a first electrolyte and second electrolytes arranged on the two sides of the first electrolyte, the first electrolyte is a solid electrolyte membrane, and the second electrolytes are obtained by curing electrolyte containing additives. According to the solid-state battery provided by the invention, the solid-state electrolyte and the liquid-state electrolyte containing the additive are organically combined, so that the interface impedance between the electrolyte and the positive electrode and between the electrolyte and the negative electrode can be remarkably enhanced, and the solid-state battery with excellent cycle stability can be obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a solid-state battery and a preparation method and application thereof. Background technique [0002] So far, the energy problem is still one of the important issues facing human development. The development of a clean, non-polluting and recyclable new energy system has become an important topic for today's scientists to explore. Among many energy technologies, lithium-ion batteries are widely used in consumer electronic products, energy storage devices, and electric vehicles due to their high energy density, good rate performance, and long service life. A green energy storage and conversion device with huge development potential. [0003] With the widespread use of lithium-ion batteries, safety issues have come one after another. Safety accidents such as fires and explosions caused by batteries in various products such as mobile phones and electric vehicles conti...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0567H01M10/42H01M10/0525H01M10/058
CPCH01M10/0562H01M10/0567H01M10/4235H01M10/0525H01M10/058
Inventor 王维郝艺刘文渊王博张广涛闫冬成胡恒广
Owner 河北光兴半导体技术有限公司
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