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Sulfide solid electrolyte and preparation method and application thereof

A technology of solid electrolyte and sulfide, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of low conductivity of sulfide solid electrolytes, eliminate the decline in ion transmission capacity, improve ion conductivity, and conduct electricity. rate-enhancing effect

Active Publication Date: 2021-05-07
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the defects and deficiencies of the existing methods, the primary purpose of the present invention is to provide a kind of sulfide solid electrolyte; Combined with ball milling to prepare and obtain sulfide solid electrolytes, the problem of low conductivity of sulfide solid electrolytes is solved; another object of the present invention is to provide the application of the sulfide solid electrolytes

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  • Sulfide solid electrolyte and preparation method and application thereof
  • Sulfide solid electrolyte and preparation method and application thereof
  • Sulfide solid electrolyte and preparation method and application thereof

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Embodiment 1

[0050] A preparation method of a sulfide solid electrolyte, the preparation steps are as follows:

[0051] (1) In a glove box under an oxygen-free and water-free argon atmosphere, weigh Li at a mass ratio of 75:25 2 S and P 2 S 5 , were prepared by dissolving with anhydrous acetonitrile to prepare a solution, respectively, to obtain Li with a concentration of 0.05mol / L 2 S solution and P with a concentration of 0.0167mol / L 2 S 5 solution; the mass is Li 2 S and P 2 S 5 1% of the total mass of aluminum nitrate and mass of Li 2 S and P 2 S 5 0.83% of the total mass of ammonium fluoride was dissolved in absolute ethanol to prepare a solution, respectively, to obtain an aluminum nitrate solution with a concentration of 0.01mol / L and an ammonium fluoride solution with a concentration of 0.03mol / L;

[0052] (2) Under an oxygen-free and water-free argon atmosphere, Li 2 Add the S solution into the high-pressure stirred tank, and then add the P 2 S 5 The solution was adde...

Embodiment 2

[0058] A preparation method of a sulfide solid electrolyte, the preparation steps are as follows:

[0059] (1) In a glove box under an oxygen-free and water-free argon atmosphere, weigh Li at a mass ratio of 70:30 2 S and P 2 S 5 ; Weighing Li 2 S and P 2 S 5 The total mass of 2% LiBH was dissolved in anhydrous tetrahydrofuran to form a solution respectively to obtain LiBH with a concentration of 0.06mol / L. 2 S solution, to obtain P with a concentration of 0.0257mol / L 2 S 5 solution and 0.05mol / L LiBH solution; the mass will be Li 2 S and P 2 S 5 1.2% of the total mass of aluminum nitrate and mass of Li 2 S and P 2 S 5 0.995% of the total mass of ammonium fluoride was dissolved in absolute ethanol to prepare a solution respectively to obtain an aluminum nitrate solution with a concentration of 0.012mol / L and an ammonium fluoride solution with a concentration of 0.036mol / L;

[0060] (2) Under an oxygen-free and water-free argon atmosphere, Li 2 Add the S solution ...

Embodiment 3

[0066] A preparation method of a sulfide solid electrolyte, the preparation steps are as follows:

[0067] (1) In a glove box under an oxygen-free and water-free argon atmosphere, weigh Li at a mass ratio of 90:10 2 S and P 2 S 5 ; Weighing Li 2 S and P 2 S 5 Total mass 35% SnS 2 , were prepared by dissolving with anhydrous acetonitrile to form a solution, respectively, to obtain Li with a concentration of 0.072mol / L 2 S solution, P with a concentration of 0.008mol / L 2 S 5 solution and 0.01mol / L SnS 2 solution; the mass is Li 2 S and P 2 S 5 1.5% of the total mass of aluminum nitrate and mass of Li 2 S and P 2 S 5 1.25% of the total mass of ammonium fluoride was dissolved in anhydrous methanol to prepare a solution, respectively, to obtain an aluminum nitrate solution with a concentration of 0.015mol / L and an ammonium fluoride solution with a concentration of 0.045mol / L;

[0068] (2) Under an oxygen-free and water-free argon atmosphere, Li 2 Add the S solution ...

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Abstract

The invention discloses a sulfide solid electrolyte and a preparation method and application thereof. The preparation method of the sulfide solid electrolyte comprises the following steps of: respectively adding Li2S, P2S5, an aluminum salt, ammonium fluoride and a modified material into a solvent in an oxygen-free and water-free inert atmosphere to obtain corresponding solutions; adding the Li2S solution into a high-pressure stirring kettle, then adding the P2S5 solution and the modified material solution, further heating, carrying out heat-preservation stirring, evaporating a solvent, carrying out drying treatment, and then cooling, so as to obtain a cooled material; adding a solvent capable of dissolving an aluminum salt into the cooled material, adding an aluminum salt solution, stirring, then adding an ammonium fluoride solution, stirring, filtering, washing the solvent, and drying to obtain powder; and performing high-pressure molding on the powder to obtain a molded material, and performing heat treatment and ball milling on the material to obtain the sulfide electrolyte. Compared with the prior art, the conductivity of an electrolyte membrane prepared from the sulfide solid electrolyte is improved by 200%.

Description

technical field [0001] The invention belongs to the technical field of solid electrolytes, in particular to a sulfide solid electrolyte and its preparation method and application. Background technique [0002] At present, the energy density of commercial lithium-ion batteries has reached the bottleneck, and the liquid organic electrolyte has potential safety hazards such as leakage, corrosion, and combustion. Compared with liquid lithium-ion batteries, all-solid-state lithium batteries have significant advantages: (1) Compared with liquid organic electrolytes, solid-state electrolytes are non-flammable, non-leaking, and non-volatile. On the one hand, the safety of the battery is fundamentally guaranteed; On the one hand, it can avoid the problem of short battery life caused by long-term circulation of liquid electrolytes; (2) liquid electrolytes will decompose at high temperatures (above 45°C), while solid electrolytes can remain stable in a wide temperature range; (3) ) us...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0562H01M10/058H01M10/0525Y02P70/50
Inventor 余国贤李京徽黄佩武
Owner JIANGHAN UNIVERSITY
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