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Sulfide solid-state electrolyte, preparation method thereof, solid-state electrolyte sheet and solid-state battery

A technology of solid electrolytes and sulfides, applied in solid electrolytes, electrolytes, non-aqueous electrolytes, etc., can solve problems such as high cost, low conductivity, and low purity

Pending Publication Date: 2021-12-24
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this application is to overcome the above-mentioned deficiencies in the prior art, provide a sulfide solid electrolyte and its preparation method, to solve the technical problems of high cost or low purity and low conductivity in the existing sulfide solid electrolyte

Method used

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  • Sulfide solid-state electrolyte, preparation method thereof, solid-state electrolyte sheet and solid-state battery
  • Sulfide solid-state electrolyte, preparation method thereof, solid-state electrolyte sheet and solid-state battery
  • Sulfide solid-state electrolyte, preparation method thereof, solid-state electrolyte sheet and solid-state battery

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preparation example Construction

[0050] On the other hand, the embodiment of the present application provides the preparation method of the above sulfide solid electrolyte. The technological process of the preparation method of the present application sulfide solid electrolyte is as follows figure 1 shown, including the following steps:

[0051] Step S01: According to Li 6-x P.S. 5-x m x+1 The stoichiometric ratio of elements is mixed with lithium metal, elemental sulfur, phosphorus pentasulfide and lithium halide to obtain a solid mixture;

[0052] Step S02: In a protective atmosphere, thermally react the solid mixture to obtain a sulfide solid electrolyte.

[0053] Wherein, in step S01, metal lithium, elemental sulfur, phosphorus pentasulfide and lithium halide are directly mixed to form a solid mixture, so that the metal lithium, elemental sulfur, phosphorus pentasulfide and lithium halide in the solid mixture are directly reacted in solid phase in step S02, directly Generating effective Li 6-x P.S. ...

Embodiment 1

[0074] This embodiment provides a sulfide solid electrolyte and a preparation method thereof. The composition of the sulfide solid electrolyte is Li 6-x P.S. 5-x Cl x+1 ; where x=0.1;

[0075] The preparation method of sulfide solid electrolyte comprises the following steps:

[0076] S1: The sulfur powder was dried in an oven at 60°C for 12 hours, and the metal lithium ingot was rolled into a 0.5mm thick lithium foil in a glove box, and then cut into lithium wires, respectively weighing 1.25g lithium wire, 2.97g sulfur powder, Put 4.13g of phosphorus pentasulfide and 1.58g of lithium chloride into a stainless steel ball milling tank, add zirconia ball milling beads with a ball-to-material ratio of 20:1, take it out and ball mill at 650r / min for 24 hours to obtain a solid mixture;

[0077] S2: Transfer the solid mixture to the glove box again, seal the powder in a quartz container and carry out vacuum treatment, then perform a heat treatment at 550°C for 12 hours, and take ...

Embodiment 2

[0080] This embodiment provides a sulfide solid electrolyte and a preparation method thereof. The composition of the sulfide solid electrolyte is Li 6-x P.S. 5-x Cl x+1 ; where x=0.4;

[0081] The preparation method of sulfide solid electrolyte comprises the following steps:

[0082] S1: The sulfur powder was dried in an oven at 70°C for 12 hours, and the metal lithium ingot was rolled into a 0.5mm thick lithium foil in a glove box, and then cut into lithium wires, respectively weighing 1.1g lithium wire, 2.52g sulfur powder, Put 4.15g of phosphorus pentasulfide and 2.22g of lithium chloride into a stainless steel ball mill tank, add zirconia ball milling beads, the ball-to-material ratio is 15:1, take it out and ball mill at a speed of 550r / min for 20h to obtain a solid mixture;

[0083] S2: Transfer the solid mixture to the glove box again, seal the powder in a quartz container and perform vacuum treatment, then heat-treat at 550°C for 10 hours, and take it out after coo...

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Abstract

The invention discloses a sulfide solid-state electrolyte, a preparation method thereof, a solid-state electrolyte sheet and a solid-state battery. The component of the sulfide solid electrolyte is Li < 6-x > PS < 5-x > M < x + 1 >, wherein M is a halogen element, and x is more than 0.1 and less than 0.8. The crystal form belongs to a space group F-43m, and is of a three-dimensional centripetal structure. The crystal form is the same as that of a standard product Li7PS6. A Raman spectrum of the compound has a clear and sharp peak at 418cm <-1 >, the compound shows a PS43-ion characteristic peak, and the compound is low in impurity content, high in purity, stable in crystal form and high in conductivity. The preparation method can effectively control the reaction between metal lithium and sulfur to be mild and controllable, and the reaction efficiency is high. The preparation method of the sulfide solid electrolyte can ensure that the prepared Li < 6-x > PS < 5-x > M < x + 1 > sulfide solid electrolyte is stable in performance, and the economic cost is remarkably reduced. The solid-state electrolyte sheet and the solid-state battery both contain the sulfide solid-state electrolyte.

Description

technical field [0001] The invention belongs to the field of solid-state batteries, and in particular relates to a sulfide solid-state electrolyte and a preparation method thereof, a solid-state electrolyte sheet, and a solid-state battery. Background technique [0002] Lithium-ion batteries have become the current large-scale energy storage due to their large output power, high energy density and working voltage, coupled with small self-discharge, wide working temperature range, almost no memory effect and environmental pollution. However, the current lithium-ion battery system has some problems that hinder its development. For example, due to the use of organic liquid electrolyte, there are safety issues such as flammability and explosion; The reaction leads to irreversible attenuation of the battery capacity; in the long-term use of the battery, the liquid electrolyte may volatilize, dry up, leak and other problems, which will affect the battery life. Therefore, in recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M2300/0068H01M2300/008Y02E60/10
Inventor 杨纳川
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD