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

A solid-state electrolyte and electrolyte technology, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, electrolytes, etc., can solve the problems of low ionic conductivity and poor electrode bonding performance, and achieve uniform ion distribution and diffusion, good stability, and improved transmission. The effect of efficiency

Pending Publication Date: 2022-02-18
SHANGHAI CENAT NEW ENERGY
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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 composite solid electrolyte and its preparation method, as well as a solid-state battery, aiming to solve the problems of low ionic conductivity and poor bonding performance with electrodes in existing solid electrolytes to a certain extent

Method used

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

Examples

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preparation example Construction

[0070] A second aspect of the embodiment of the present invention provides a method for preparing a composite solid electrolyte, comprising the following steps:

[0071] S10. Obtaining an inorganic electrolyte skeleton, the inorganic electrolyte skeleton includes two opposite surfaces, and at least one surface of the inorganic electrolyte skeleton is provided with a plurality of holes;

[0072] S20. Filling the pores with a polymer electrolyte, and at least forming a polymer coating layer on the surface of the inorganic electrolyte skeleton with pores to obtain the composite solid electrolyte.

[0073] In the preparation method of the composite solid electrolyte provided by the second aspect of the present invention, an inorganic electrolyte skeleton containing several pores is used as a base material, a polymer electrolyte is filled in the pores, and a polymer electrolyte is formed at least on the surface of the inorganic electrolyte skeleton with pores. The polymer coating l...

Embodiment 1

[0092] A composite solid-state electrolyte, showing attached image 3 As shown in the schematic diagram, including the following preparation methods:

[0093] ①Preparation of inorganic electrolyte skeleton: Select a chopping board with closely packed hexagonal matrix pins, the pin diameter is 50 μm, the spacing is 200 μm, and the pin length is 100 μm, fill the LLZO powder into the cutting board and tap it, then apply 100 MPa pressure at 1100 ° C, and cool it. Then, it is separated from the cutting board to obtain an inorganic electrolyte skeleton with a volume fraction of 5% through holes;

[0094] ②Filled polymer: A PPC film is stacked on the surface of the ceramic skeleton, and then hot-pressed at 45 °C with a pressure of 50 MPa, so that the PPC is heated and melted into the through holes of the LLZO skeleton, and a polymer layer with a thickness of 8 μm is formed on the surface; A composite solid electrolyte is obtained.

Embodiment 2

[0096] A composite solid-state electrolyte, comprising the following preparation methods:

[0097] ①Preparation of inorganic electrolyte skeleton: Select a chopping block with closely packed hexagonal matrix pins, the pin diameter is 50 μm, the spacing is 150 μm, and the pin length is 100 μm, fill the LLZO powder into the cutting board and tap it, then apply 110 MPa pressure at 1000 ° C, and cool it. Then, it is separated from the cutting board to obtain an inorganic electrolyte framework with a volume fraction of 10% through holes;

[0098] ②Filled polymer: A PPC film is stacked on the surface of the ceramic skeleton, and then hot-pressed at 45 °C with a pressure of 50 MPa, so that the PPC is heated and melted into the through holes of the LLZO skeleton, and a polymer layer with a thickness of 8 μm is formed on the surface; A composite solid electrolyte is obtained.

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Abstract

The invention belongs to the technical field of solid-state batteries, and particularly relates to a composite solid-state electrolyte, which comprises an inorganic electrolyte framework and a polymer electrolyte, the inorganic electrolyte framework comprises two opposite surfaces, at least one surface of the inorganic electrolyte framework is provided with a plurality of holes extending towards the other surface, the holes are filled with the polymer electrolyte, and the polymer electrolyte at least wraps the surface, provided with the holes, of the inorganic electrolyte framework. The composite solid electrolyte provided by the invention is high in ion migration rate, uniform in ion distribution and diffusion and good in stability; and the electrolyte and the electrode are tightly combined, so that the interface impedance can be reduced. The cycle stability, the charge-discharge effect and other performance of the solid-state battery are improved, and the electrochemical performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and in particular relates to a composite solid-state electrolyte and a preparation method thereof, and a solid-state battery comprising the solid-state electrolyte. Background technique [0002] With the gradual expansion of the application range of lithium-ion batteries, people have put forward higher requirements for the safety performance, service life and energy density of batteries. However, the safety of lithium-ion batteries has always been a concern due to the side reactions of the liquid electrolyte at the electrode interface and the leakage of the electrolyte. The solid-state battery assembled with solid electrolyte can effectively prevent the short-circuit problem caused by lithium metal dendrites, making it possible to use lithium metal as the negative electrode of the battery, effectively solving the safety hazards caused by liquid electrolytes, and significantly improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0565H01M10/0562H01M10/058H01M10/0525H01M2300/0094Y02E60/10Y02P70/50
Inventor 杨成林
Owner SHANGHAI CENAT NEW ENERGY
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