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Sulfide electrolyte and preparation method thereof

A technology of sulfide electrolyte and preparation steps, which is applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte storage battery, etc., can solve the problems of poor air stability, achieve small binding force, improve air stability, and improve ion conductivity Effect

Active Publication Date: 2020-05-08
来骑哦互联网技术(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of sulfide electrolyte and its preparation method, to solve the problem that the air stability of sulfide electrolyte is poor in the prior art, and it is easy to react with moisture in the air to generate hydrogen sulfide during storage and use.

Method used

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  • Sulfide electrolyte and preparation method thereof
  • Sulfide electrolyte and preparation method thereof

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Embodiment 1

[0034] Under nitrogen protection, the molar ratio is (4-x): (1-x): x: 4 to get raw materials lithium sulfide, germanium sulfide and sulfur M, wherein x=0.6; wherein M is P; lithium sulfide, Pour germanium sulfide and phosphorus sulfide into a ball mill tank, and ball mill and mix for 4 hours under nitrogen protection to obtain ball abrasive; then add silicon microcrystals with 1% of the mass of the ball abrasive to the ball mill, stir and mix for 10 minutes, and then Under the conditions, the green body is pressed into tablets to obtain a green body; then the green body is moved into a microwave heater, and under the condition of nitrogen protection, under the condition of a microwave power of 200W, it is heated to 250°C, and after heat preservation and heat treatment for 1 hour, it is cooled and discharged. The product sulfide electrolyte is obtained. By controlling the microwave heating power and holding temperature, the crystallized Li in the product sulfide electrolyte can...

Embodiment 2

[0036] Under nitrogen protection, the molar ratio is (4-x): (1-x): x: 4 to get raw materials lithium sulfide, germanium sulfide and M sulfide, wherein x=0.8; wherein M is Zn; lithium sulfide, Pour the germanium sulfide and zinc sulfide into a ball mill jar, and ball mill and mix them for 5 hours under the protection of nitrogen to obtain a ball mill; then add silicon microcrystals with 2% mass of the ball mill to the ball mill, stir and mix for 12 minutes, and then mix them under a pressure of 300 MPa Under the conditions, the green body is pressed into tablets to obtain the green body; then the green body is moved into the microwave heater, under the condition of nitrogen protection, and the microwave power is 300W, heated to 300 ° C, heat preservation and heat treatment for 2 hours, cooled, and discharged. The product sulfide electrolyte is obtained. By controlling the microwave heating power and holding temperature, the crystallized Li in the product sulfide electrolyte can...

Embodiment 3

[0038] Under nitrogen protection state, the molar ratio is (4-x): (1-x): x: 4 to get raw materials lithium sulfide, germanium sulfide and sulfur M, wherein x=1.0; wherein M is Ga; lithium sulfide, Pour the germanium sulfide and gallium sulfide into a ball mill jar, and ball mill and mix them for 6 hours under the protection of nitrogen to obtain a ball mill; then add silicon microcrystals with 3% mass of the ball mill to the ball mill, stir and mix for 15 minutes, and then mix them under a pressure of 350 MPa Under the same conditions, the green body was pressed into tablets to obtain the green body; then the green body was moved into a microwave heater, and under the condition of nitrogen protection, under the condition of microwave power of 400W, heated to 350°C, heat preservation and heat treatment for 3 hours, cooled, and discharged. The product sulfide electrolyte is obtained. By controlling the microwave heating power and holding temperature, the crystallized Li in the p...

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Abstract

The invention discloses a sulfide electrolyte and a preparation method thereof, and belongs to the technical field of battery materials. The sulfide electrolyte in the product developed by the invention is Li<4-x>Ge<1-x>M<x>S<4>, wherein the sulfide electrolyte contains Li<4-x>Ge<1-x>M<x>S<4> which is partially crystallized; and the sulfide electrolyte comprises 1-3% of silicon microcrystals, wherein the mass ratio of the crystallized Li<4-x>Ge<1-x>M<x>S<4> to the non-crystallized Li<4-x>Ge<1-x>M<x>S<4> is 1: 5 to 1: 20. The average particle size of the partially crystallized Li<4-x>Ge<1-x>M<x>S<4> is 0.01-50 [mu]m, and the average specific surface area is 1-20 m<2> / g. The product obtained by the preparation method disclosed by the invention not only has good ionic conductivity, but also has good air stability.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a sulfide electrolyte and a preparation method thereof. Background technique [0002] As an important part of the battery, the electrolyte plays the role of transporting ions between the positive and negative electrodes. Choosing the right electrolyte is the key to improving the battery power density, energy density, cycle life, reducing the internal resistance of the battery, and ensuring its safety. . Electrolytes generally include liquid electrolytes, gel electrolytes, and solid electrolytes. At present, commercialized batteries mainly use organic liquid electrolytes as lithium ion transport media, but organic liquid electrolytes are volatile and flammable, which poses safety hazards during battery charging and discharging. Compared with organic liquid electrolytes, solid electrolytes have obvious characteristics and advantages. Solid electrolytes do not contain li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052
CPCH01M10/052H01M2300/0068Y02E60/10
Inventor 陈开兵
Owner 来骑哦互联网技术(深圳)有限公司
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