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Three-dimensional PEO polymer composite solid electrolyte containing modified inorganic filler, preparation method and solid-state lithium ion battery

A solid electrolyte, solid electrolyte membrane technology, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of reducing the conductivity of polymer electrolytes, hindering the performance of polymer solid electrolytes, and having no lithium ion transport activity. Achieve the effect of improving ionic conductivity and cycle performance, improving resistance to lithium dendrite precipitation, and reducing crystallization

Pending Publication Date: 2022-05-27
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inorganic filler used is an inert material, which has no lithium ion transport activity, reduces the conductivity of the polymer electrolyte, and hinders the further improvement of the performance of the polymer solid electrolyte, which has certain technical limitations.

Method used

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  • Three-dimensional PEO polymer composite solid electrolyte containing modified inorganic filler, preparation method and solid-state lithium ion battery

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preparation example Construction

[0034] A method for preparing the three-dimensional PEO polymer composite solid electrolyte containing modified inorganic filler, comprising the following steps:

[0035] a. Preparation of LASO inorganic filler coated with polymethyl methacrylate:

[0036] (1) Methyl methacrylate and benzoyl peroxide with a mass fraction of 0.4-0.6% were added to the container according to the mass ratio of 20-30:0.5-2.0, mixed and sonically stirred for 20-45 minutes to obtain an amorphous polymethyl methacrylate mixed solution;

[0037] (2) To step (1) to the amorphous polymethyl methacrylate mixed solution was added with an average particle size of 300-1000nm LASO particles, LASO particles and methyl methacrylate mass ratio of 70-80:3-5; continue to stir for 10-30 minutes, to obtain the mixture;

[0038] (3) The mixed liquid balls obtained in step (2) are ground for 15-30 minutes, the ball-to-material ratio is 2-4:1-1.5, the ground powder is rinsed with anhydrous ethanol for 2-5 minutes, the org...

Embodiment 1

[0048]A three-dimensional PEO polymer composite solid electrolyte containing modified inorganic filler, comprising a modified inorganic filler and a three-dimensional PEO polymer composite solid electrolyte, wherein said modified inorganic filler is a polymethyl methacrylate coated LASO inorganic filler; the modified inorganic filler and three-dimensional PEO polymer composite solid electrolyte mass ratio of 2: 65.

[0049] A method for preparing the three-dimensional PEO polymer composite solid electrolyte containing modified inorganic filler, comprising the following steps:

[0050] a. Preparation of LASO inorganic filler coated with polymethyl methacrylate:

[0051] (1) Methyl methacrylate and benzoyl peroxide with a mass fraction of 0.5% are added to the container according to the mass ratio of 25:1.5, mixed with ultrasonic stirring for 30 minutes to obtain an amorphous polymethyl methacrylate mixed solution;

[0052] (2) To step (1) to the amorphous polymethyl methacrylate mi...

Embodiment 2

[0060] A three-dimensional PEO polymer composite solid electrolyte containing modified inorganic filler, comprising a modified inorganic filler and a three-dimensional PEO polymer composite solid electrolyte, wherein said modified inorganic filler is a polymethyl methacrylate coated LASO inorganic filler; the modified inorganic filler and three-dimensional PEO polymer composite solid electrolyte mass ratio of 1: 50.

[0061] A method for preparing the three-dimensional PEO polymer composite solid electrolyte containing modified inorganic filler, comprising the following steps:

[0062] a. Preparation of LASO inorganic filler coated with polymethyl methacrylate:

[0063] (1) Methyl methacrylate and benzoyl peroxide with a mass fraction of 0.4% are added to the container according to the mass ratio of 20:0.5, mixed with ultrasonic stirring for 20 minutes to obtain an amorphous polymethyl methacrylate mixed solution;

[0064] (2) To step (1) to the amorphous polymethyl methacrylate m...

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Abstract

The invention relates to the technical field of solid-state lithium ion batteries, and discloses a three-dimensional PEO polymer composite solid electrolyte containing a modified inorganic filler, a preparation method and a solid-state lithium ion battery. Amorphous polymethyl methacrylate (PMMA) is utilized to coat an LASO inorganic filler, and LASO has lithium ion transmission activity, so that the solid-state lithium ion battery can be used as a lithium ion battery. And the PMMA and the PEO have good compatibility, so that the dispersion uniformity of the inorganic filler in the polymer solid electrolyte is improved, the ionic conductivity and the mechanical strength of the three-dimensional PEO polymer composite solid electrolyte are remarkably improved, and an important technical reference is provided for research and development of a high-performance solid battery.

Description

Technical field [0001] The present invention relates to the field of solid-state lithium-ion battery technology, in particular to a three-dimensional PEO polymer composite solid electrolyte containing a modified inorganic filler, a preparation method and a solid-state lithium-ion battery. Background [0002] Due to the safety of traditional lithium-ion secondary batteries, solid-state lithium batteries are recovering, and due to the excellent safety performance of solid electrolytes, it has become a hot technical hotspot in the field of power batteries in recent years. Solid electrolytes can be divided into ceramic type and polymer type, ceramic solid electrolytes such as oxide and sulfide electrolytes, at room temperature exhibits very high lithium ion conductivity, however, poor mechanical properties and great interface impedance limit their large-scale commercial applications. Compared with the solid ceramic electrolyte, polyoxyethylene (PEO) and other polymer solid electrolyt...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082Y02P70/50
Inventor 宫娇娇陈军黄建根郑利峰
Owner WANXIANG 123 CO LTD