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Preparation method of all-solid-state battery, and all-solid-state battery

An all-solid-state battery and solid-state electrolyte technology, applied in the manufacture of electrolyte batteries, lithium batteries, secondary batteries, etc., can solve the problems of insufficient contact between electrodes and electrolytes, difficulty in industrialized production, and large internal resistance of batteries, and avoid environmental dew point. restrictions, avoid the use of highly toxic solvents, and the effect of a simple preparation process

Inactive Publication Date: 2021-06-08
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrodes of the above-mentioned solid-state batteries are pressed together with the solid-state electrolyte when the battery is assembled, and there is a problem of poor contact between the electrodes and the solid-state electrolyte, resulting in a large internal resistance of the battery.
[0008] Existing solid-state batteries have problems such as complex preparation process, insufficient contact between electrodes and electrolytes, and difficulty in industrial production, because how to ensure that solid-state batteries have a simple preparation process without mixing solid-state electrolytes in the electrode preparation process, Improving the interface between the electrode and the electrolyte has become an urgent problem to be solved

Method used

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  • Preparation method of all-solid-state battery, and all-solid-state battery

Examples

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Effect test

Embodiment 1

[0048] This embodiment provides a method for preparing an all-solid-state battery, such as figure 1 As shown, the preparation method specifically includes the following steps:

[0049] (Ⅰ) The positive electrode, negative electrode and 75Li 2 S-25P 2 S 5 Assembled into an all-solid-state battery assembly;

[0050] (II) configure the second solid electrolyte solution under nitrogen atmosphere, the second solid electrolyte solution includes Li 6 P.S. 5 Cl and ethanol, the mass fraction of ethanol is 70%, adopt the mode of vacuum liquid injection to inject the second solid electrolyte solution into the all-solid-state battery assembly, the vacuum degree of vacuum injection liquid is 70kPa, inject the second solid electrolyte solution after 100 ℃ Under vacuum drying;

[0051] (Ⅲ) Sealing after drying to obtain an all-solid-state battery.

Embodiment 2

[0053] This embodiment provides a method for preparing an all-solid-state battery, such as figure 1 As shown, the preparation method specifically includes the following steps:

[0054] (I) The positive electrode, negative electrode and Li 10 GeP 2 S 12 Assembled into an all-solid-state battery assembly;

[0055] (II) configure the second solid electrolyte solution under nitrogen atmosphere, the second solid electrolyte solution includes Li 9.54 Si 1.74 P 1.44 S 11.7 Cl 0.3 and methanol, the mass fraction of methanol is 60%, and the second solid electrolyte solution is injected into the all-solid-state battery assembly by means of vacuum injection, and the vacuum degree of vacuum injection is 40kPa; after injecting the second solid electrolyte solution, at 50 ° C carry out vacuum drying;

[0056] (Ⅲ) Sealing after drying to obtain an all-solid-state battery.

Embodiment 3

[0058] This embodiment provides a method for preparing an all-solid-state battery, such as figure 1 As shown, the preparation method specifically includes the following steps:

[0059] (I) Assemble the positive electrode, negative electrode and the first solid electrolyte into an all-solid battery assembly, and the first solid electrolyte is 75Li 2 S-25P 2 S 5 and Li 10 GeP 2 S 12 combination of 75Li 2 S-25P 2 S 5 and Li 10 GeP 2 S 12 The mass ratio is 1:1;

[0060] (II) configure the second solid electrolyte solution under nitrogen atmosphere, the second solid electrolyte solution includes Li 6 P.S. 5 Br and ethanol, the mass fraction of ethanol is 90%, and the second solid electrolyte solution is injected into the all-solid-state battery assembly by means of vacuum injection, and the vacuum degree of vacuum injection is 90kPa; Under vacuum drying;

[0061] (Ⅲ) Sealing after drying to obtain an all-solid-state battery.

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Abstract

The invention provides a preparation method of an all-solid-state battery, and the all-solid-state battery. The preparation method comprises the following steps: assembling an all-solid-state battery assembly, injecting a solid electrolyte solution, and conducting drying to obtain the all-solid-state battery. According to the invention, the all-solid-state battery assembly is filled into the solid electrolyte solution, so an ion path is formed, an interface between electrodes and the electrolyte is improved, the need of adding the solid electrolyte and an additive in the preparation process of the electrode of the all-solid-state battery is avoided, the use of highly toxic solvents such as ethylbenzene is avoided, and limitation on the environmental dew point in the electrode preparation process is effectively avoided; and the preparation method provided by the invention can be compatible with existing liquid lithium ion battery production equipment, and has the characteristics of being simple in preparation process, easy to industrialize, high in applicability and the like.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to an all-solid-state battery, in particular to a preparation method of an all-solid-state battery and an all-solid-state battery. Background technique [0002] At present, most of the safety problems of electric vehicles are caused by power batteries. While the industry is constantly pursuing high energy density of batteries to improve the driving range of vehicles, safety problems have become more prominent. Solid-state batteries that replace organic electrolytes with solid-state electrolytes are expected to become safe alternatives to lithium-ion batteries currently on the market. [0003] Lithium sulfide (Li 2 S) and other sulfide-based solid electrolytes as starting materials have extremely high ionic conductivity (10 -3 ~10 -2 S / cm), the all-solid lithium secondary battery does not use flammable organic solvents, thus simplifying the safety device. In addition to enabling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/052H01M10/0525
CPCH01M10/058H01M10/052H01M10/0525Y02P70/50
Inventor 翟喜民姜涛陈慧明孙焕丽胡景博赵光宇闫晟睿
Owner CHINA FIRST AUTOMOBILE
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