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Sulfide composite solid-state electrolyte, method for preparing same and solid-state battery

A technology of solid electrolyte and solid electrolyte membrane, which is applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, solid electrolyte, etc. It can solve the problems of impurity phase generation and ion conductivity reduction, and achieve the effect of improving ion conductivity and simple process

Inactive Publication Date: 2019-02-19
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, studies have found that sulfur reacts with the ether oxygen bonds of polyethers, resulting in the dissolution of sulfur or sulfides in polyether polymers, which will generate heterogeneous phases when the sulfide composite electrolyte is prepared into a film. leading to a decrease in ionic conductivity

Method used

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  • Sulfide composite solid-state electrolyte, method for preparing same and solid-state battery

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preparation example Construction

[0049] According to another aspect of the present invention, a method for preparing a sulfide composite solid state electrolyte is provided, comprising the steps of:

[0050] S1. Weigh the raw materials for preparing the sulfide solid electrolyte matrix or the sulfide solid electrolyte matrix according to a certain mass, mix it with a certain mass of polyalkylene carbonate, then put it into a centrifuge tank, add a certain solvent, and then add Grinding balls, sealed centrifuge tank;

[0051] S2, drive the sealed centrifugal tank to rotate, perform centrifugal crushing, and obtain slurry;

[0052] S3, scrape-coat the slurry onto the plate, and obtain a sulfide composite solid electrolyte membrane after drying.

[0053] The preparation method of the sulfide composite solid-state electrolyte provided by the present invention, on the one hand, since polyalkylene carbonate is used as the composite material, which does not contain ether oxygen bonds, the sulfur or sulfide in the s...

Embodiment 1

[0078] According to the preparation method of the present invention, first carry out step S1: weigh the raw material for preparing the sulfide solid electrolyte matrix according to a certain quality, and mix it with a certain quality of polyalkylene carbonate, then put it into a centrifuge tank, add a certain amount of Solvent, then add grinding balls, and seal the centrifuge jar. The specific operation is as follows:

[0079] Wherein the polyalkenyl carbonate selects polypropylene carbonate; The raw material for preparing the sulfide solid electrolyte matrix selects Li 2 S and P 2 S 5 .

[0080] Weigh Li separately 2 S, P 2 S 5 and polypropylene carbonate raw material in the centrifuge tank of polytetrafluoroethylene, add Φ10 zirconia ball; Wherein, Li 2 S and P 2 S 5 The molar ratio is 7:3, (Li 2 S+P 2 S 5 ): Polypropylene carbonate (molecular weight: 350000) mass ratio is 94:6, ball-to-material mass ratio is 5:1, ball-to-material ratio refers to the ratio of gri...

Embodiment 2

[0086] The other parameters of this example are the same as those of Example 1, the only difference is that step S4 is performed after step S3, and the sulfide solid electrolyte membrane is hot-pressed at 180°C for 10min under a pressure of 10Mpa to obtain a solid electrolyte membrane It is 40um.

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Abstract

The invention relates to a sulfide composite solid-state electrolyte, a method for preparing the same and a solid-state battery. The sulfide composite solid-state electrolyte is prepared from polycarbonate alkenyl ester and raw materials for preparing sulfide solid-state electrolyte matrixes or is prepared from the polycarbonate alkenyl ester and the sulfide solid-state electrolyte matrixes. The method includes steps of S1, weighing the raw materials for preparing the sulfide solid-state electrolyte matrixes or the sulfide solid-state electrolyte matrixes according to certain weights, mixing the raw materials or the sulfide solid-state electrolyte matrixes with the polycarbonate alkenyl ester with a certain weight to obtain mixtures, then placing the mixtures into centrifugal tanks, addingsolvents into the centrifugal tanks, further adding grinding balls into the centrifugal tanks and sealing the centrifugal tanks; S2, driving the sealed centrifugal tanks to rotate and carrying out centrifugal crushing to obtain slurry; S3, scraping the slurry on platy articles and carrying out drying to obtain sulfide composite solid-state electrolyte membranes. The sulfide composite solid-stateelectrolyte, the method and the solid-state battery have the advantages that the polycarbonate alkenyl ester is used as a composite material for the sulfide composite solid-state electrolyte, and accordingly the ionic conductivity of the sulfide composite solid-state electrolyte can be improved.

Description

technical field [0001] The invention relates to a sulfide composite solid electrolyte, a preparation method thereof, and a solid-state battery, belonging to the technical field of battery preparation. Background technique [0002] At present, the electrolyte of commercial lithium-ion batteries is generally an organic liquid, that is, an electrolyte. When an internal short circuit or overheating occurs in a lithium-ion battery, this organic liquid electrolyte can easily cause safety hazards such as thermal runaway and fire. Solid-state electrolytes have the advantages of high safety, wide voltage window, wide operating temperature range, good cycle performance, low self-discharge rate, easy thin film and miniaturization, etc. The corresponding solid-state batteries are an important development direction of lithium batteries. The use of solid electrolyte can fundamentally solve the safety problem of the battery. [0003] Solid electrolytes are divided into polymer solid elect...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2300/0068H01M2300/0082H01M2300/0091Y02E60/10Y02P70/50
Inventor 倪海芳陈渊周美丽刘茜
Owner 桑德新能源技术开发有限公司
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