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Preparation method of sulfide solid electrolyte

A solid electrolyte and sulfide technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of unfavorable industrial production and high production costs, and achieve the effects of reducing preparation costs, easy composition, and easy availability of raw materials

Pending Publication Date: 2020-03-06
YANGTZE RIVER DELTA PHYSICS RES CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned technical solutions all use lithium sulfide as a raw material, resulting in higher production costs, which is not conducive to industrial production

Method used

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  • Preparation method of sulfide solid electrolyte
  • Preparation method of sulfide solid electrolyte
  • Preparation method of sulfide solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1: Prepare the anhydrous ethylene glycol dimethyl ether solution of metal lithium-biphenyl: weigh 30.842 g of biphenyl and dissolve it in the corresponding volume of anhydrous ethylene glycol dimethyl ether solvent according to the concentration of 1 mol / L. Benzene is completely dissolved, add 1.3882 g of metal lithium wire with a length of 1 cm and a width of 1 mm, and let it stand at room temperature until it is completely dissolved;

[0022] Step 2: Weigh 3.206 g of elemental sulfur and 7.408 g of phosphorus pentasulfide into the above-mentioned anhydrous ethylene glycol dimethyl ether solution of metal lithium-biphenyl, and stir at 80 °C for 6 h to obtain a suspension;

[0023] Step 3: Separate the suspension from the precipitate and the supernatant with a centrifuge at a speed of 8000 r / min and a centrifugation time of 20 min. The supernatant is recovered for reuse, and the precipitate is centrifugally washed with anhydrous ethylene glycol xylene 3 times, the ...

Embodiment 2

[0026] Step 1: Prepare metal lithium-naphthalene anhydrous tetrahydrofuran solution: weigh 25.636 g of naphthalene and dissolve it in the corresponding volume of anhydrous tetrahydrofuran solvent at a concentration of 2 mol / L. After the biphenyl is completely dissolved, add 1.3882 g of 2 mm, 0.5 mm thick lithium metal, let it stand until it is completely dissolved;

[0027]Step 2: Weigh 3.206 g of elemental sulfur and 9.525 g of phosphorus pentasulfide and add the above-mentioned lithium-naphthalene anhydrous tetrahydrofuran solution, and stir at room temperature for 8 h to obtain a suspension;

[0028] Step 3: Use a centrifuge to separate the suspension from the precipitate and the supernatant at a speed of 8000 r / min, and the centrifugation time is 20 min. The supernatant is recovered for reuse. The precipitate is centrifuged and washed 3 times with anhydrous THF at The centrifugation time was 6000 r / min, and the centrifugation time was 10 min; then the precipitate was dried...

Embodiment 3

[0030] Step 1: Prepare the anhydrous ethylene glycol dimethyl ether solution of metal lithium-biphenyl: weigh 30.842 g of biphenyl and dissolve it in the corresponding volume of anhydrous ethylene glycol dimethyl ether solvent according to the concentration of 1 mol / L. Benzene is completely dissolved, add 1.3882 g of metal lithium wire with a length of 1 cm and a width of 1 mm, and let it stand at room temperature until it is completely dissolved;

[0031] Step 2: Weigh 1.603 g of elemental sulfur and 11.112 g of phosphorus pentasulfide into the above-mentioned anhydrous ethylene glycol dimethyl ether solution of metal lithium-biphenyl, and stir at 80 °C for 6 h to obtain a suspension;

[0032] Step 3: Separate the suspension from the precipitate and the supernatant with a centrifuge at a speed of 8000 r / min and a centrifugation time of 20 min. The supernatant is recovered for reuse, and the precipitate is centrifugally washed with anhydrous ethylene glycol xylene 3 times, the...

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Abstract

The invention provides a low-cost preparation method of a sulfide solid electrolyte composed of Li, P and S elements and with freely controllable components. The preparation method comprises the following steps: adding elemental sulfur and phosphorus pentasulfide into an organic ether solution of a metal lithium-aromatic compound, and mixing to obtain a mixed solution; and sequentially carrying out mixing reaction, separation, precipitation, drying and heat treatment on the mixed solution to obtain the sulfide solid electrolyte containing Li, P and S as constituent elements. According to the preparation method of the sulfide solid electrolyte, raw materials are cheap and easy to obtain, the process is simple, production is safe, product components are easy to adjust, and production cost can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of solid electrolytes, in particular to a preparation method of a sulfide solid electrolyte. Background technique [0002] Solid-state electrolytes mainly include three categories: polymers, oxides, and sulfides. Sulfide electrolytes are considered to be the most promising solid-state electrolyte materials due to their highest Li-ion conductivity and relatively "soft" mechanical properties (good solid-solid interfacial contact can be achieved only by low-temperature pressing). [0003] At present, a variety of sulfide solid-state electrolytes have been developed and applied, among which the relatively simple and widely concerned system is the sulfide solid-state electrolyte (LPS system) containing Li, P, and S as constituent elements. The system has high ionic conductivity (>10 −4 S cm −1 ), without adding any additional elements (Si, Ge, Al). At present, the common synthesis methods of this system a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562
CPCH01M10/0562H01M2300/0068Y02E60/10
Inventor 吴凡许洁茹李泓
Owner YANGTZE RIVER DELTA PHYSICS RES CENT CO LTD
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