Composite solid-state electrolyte, solid-state battery and preparation method of solid-state battery

A solid-state electrolyte and solid-state battery technology, which is applied in composite electrolytes, secondary batteries, circuits, etc., can solve the problems of poor electrolyte flexibility and mechanical properties, poor stability and compatibility, and limited scope of application, and achieve good combination stability , good self-supporting flexibility, optimized contact interface effect

Inactive Publication Date: 2020-06-05
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a solid-state battery, aiming at solving the problem of low ionic conductivity of the solid-state electrolyte in the existing solid-state battery, interface contact resistance between the solid-state electrolyte and the positive electrode, poor stability and compatibility, electrolyte flexibility and mechanical problems. Technical problems such as poor performance and limited scope of application

Method used

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  • Composite solid-state electrolyte, solid-state battery and preparation method of solid-state battery
  • Composite solid-state electrolyte, solid-state battery and preparation method of solid-state battery
  • Composite solid-state electrolyte, solid-state battery and preparation method of solid-state battery

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preparation example Construction

[0044] An embodiment of the present invention provides a method for preparing a solid-state battery, comprising the following steps:

[0045] S10. Dissolving the polymer, lithium salt, ionic liquid, and inorganic solid electrolyte material in an organic solvent and then mixing them to obtain an electrolyte slurry; wherein, the polymer, the lithium salt, the ionic liquid, and the inorganic The mass ratio of the solid electrolyte material is 1: (0.1-0.6): (0.1-1): (0.05-0.2);

[0046] S20. Obtain the first pole piece, deposit the electrolyte slurry on the surface of the first pole piece away from the current collector, and form a composite solid electrolyte layer on the surface of the first pole piece;

[0047] S30. Deposit electrode slurry on the surface of the composite solid electrolyte layer away from the first pole piece to form a second pole piece to obtain a solid-state battery; wherein, the first pole piece and the second pole piece The sheets are independently selected...

Embodiment 1

[0075] A solid battery comprising the steps of:

[0076] ①Preparation of solid electrolyte membrane: PVDF, LiTFSI, ionic liquid (1-butyl-1-methylpyrrolidine bis(trifluoromethanesulfonyl)imide), LLZTO powder in mass ratio 100:50:30:10 , dissolved / dispersed in the solvent DMF and fully stirred for 8 hours to obtain a solid electrolyte slurry; pour the slurry into a polytetrafluoroethylene circular mold, heat and dry it under vacuum at 100°C overnight, and obtain a composite solid electrolyte membrane with a thickness of about 150 microns;

[0077] ② Preparation of positive electrode sheet: Dissolve / disperse positive electrode material NCM811, conductive agent sp, binder PVDF, and plasticizer succinonitrile in the solvent NMP in a ratio of 70:10:10:10, stir for 8 hours, and smear , 100 degrees vacuum heating and drying overnight to obtain the positive electrode sheet;

[0078] ③Preparation of solid-state battery: On the positive electrode sheet in step ②, control the thickness ...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a composite solid-state electrolyte which comprises an organic polymer, a lithium salt, an ionic liquid and an inorganic solid electrolyte material, wherein the mass ratio of the polymer to the lithium salt to the ionic liquid to the inorganic solid electrolyte material is 1: (0.1-0.6): (0.1-1): (0.05-0.2). Thecomposite solid-state electrolyte disclosed by the invention is high in ionic conductivity, high in stability, good in compatibility with positive and negative electrodes and excellent in mechanical property, and the composite solid-state electrolyte has excellent mechanical property due to a polymer framework; the lithium salt provides lithium ions for the solid electrolyte; the ionic liquid improves the conductivity of the electrolyte; the inorganic solid electrolyte material can be crosslinked with the polymer to further improve the mechanical properties of the solid electrolyte and increase the strength.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a composite solid electrolyte, a solid battery and a preparation method thereof. Background technique [0002] Traditional lithium-ion batteries are facing more and more safety issues. The volatile, flammable and explosive organic electrolyte is the main factor causing safety problems of lithium-ion batteries. As the next generation of lithium battery technology, solid-state batteries have outstanding advantages such as good safety and high energy density on the basis of inheriting the advantages of traditional lithium batteries. However, the current development of solid-state lithium (ion) batteries faces multiple difficulties. First, the ionic conductivity of solid electrolytes needs to continue to improve. Common solid electrolytes include inorganic solid electrolytes, such as: garnet-type oxide electrolyte LLZO system; organic solid electrolytes, such as: poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0088Y02E60/10
Inventor 邓永红吴唯魏振耀王曼王军王庆荣池上森
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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