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Lithium sulfide series solid electrolyte material added with lithium silicon alloy powder and preparation method thereof

A solid electrolyte, lithium-silicon alloy technology, applied in electrolytes, nanotechnology for materials and surface science, circuits, etc., to achieve the effect of high lithium ion conductivity

Active Publication Date: 2017-05-31
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, this type of invention technology only utilizes lithium-silicon alloy materials as negative electrode materials for thermal batteries, lithium-ion batteries, lithium-ion capacitors, lithium-sulfur batteries, and lithium-air batteries to accept the intercalation of lithium ions during charging, and does not involve adding Lithium-silicon alloy powder to improve the conductivity of lithium ions in solid electrolytes

Method used

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  • Lithium sulfide series solid electrolyte material added with lithium silicon alloy powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Mixed high energy ball milling process:

[0024] In a glove box protected by an argon atmosphere with low moisture (≤1ppm) and low oxygen content (≤1ppm), the molar ratio of lithium sulfide, phosphorus sulfide, lithium-silicon alloy powder and sulfur powder is 2.5:0.75:0.05: The proportion of 0.05 ingredients, stirring and mixing, and the zirconia balls with a diameter of 3-10mm are sealed into the ball milling tank. The mass ratio of the zirconia balls in the tank to the mixture is 2:0.7; the sealed ball milling tank Dry mixing ball milling is adopted in a planetary high-energy ball mill, and the ball milling time is 36 hours to obtain an amorphous lithium sulfur phosphorus silicon mixture;

[0025] 2) Heat treatment process:

[0026] The obtained amorphous lithium sulfur phosphorus silicon mixture is sealed in a glove box with low moisture (≤1ppm) and low oxygen content (≤1ppm) protected by an argon atmosphere, and then heated to 100°C under vacuum for heat treatm...

Embodiment 2

[0032] Repeat Example 1, the difference is:

[0033] In step 1), lithium sulfide, phosphorus sulfide, lithium-silicon alloy powder and sulfur powder are mixed in a molar ratio of 3:1:0.1:0.05; the mass ratio of zirconia balls to the mixture is 2:1 , the ball milling time is 30 hours;

[0034] In step 2), the heat treatment is carried out at 180° C., and the heat treatment time is 5 hours.

[0035] After the solid electrolyte powder prepared in this example was pressed into a standard sample, the ion conductivity of the sample in this example was measured at 25°C at room temperature by using the CHI660 electrochemical workstation by AC impedance method to be 6.4×10 -4 S / cm.

Embodiment 3

[0037] Repeat Example 1, the difference is:

[0038] In step 1), lithium sulfide, phosphorus sulfide, lithium-silicon alloy powder and sulfur powder are mixed in a molar ratio of 3:0.5:0.15:0.1; the mass ratio of zirconia balls to the mixture is 2:0.5 , the ball milling time is 40 hours;

[0039] In step 2), the heat treatment is carried out at 220° C., and the heat treatment time is 4 hours.

[0040] After pressing the solid electrolyte powder prepared in this example into a standard sample, the ion conductivity of the sample in this example was measured to be 6.8×10 at a room temperature of 25° C. -4 S / cm.

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Abstract

The invention discloses a lithium sulfide series solid electrolyte material added with lithium silicon alloy powder and a preparation method thereof. The preparation method comprises the following steps that (1) under the atmosphere protection condition, lithium sulfide, phosphorus sulfide, the lithium silicon alloy powder and sulfur are weighed according to a mole ratio of (2.5 to 3.5) to (0.5 to 1.0) to (0.05 to 0.20) to (0.01 to 0.1); the materials are uniformly mixed to obtain an amorphous state lithium sulfur phosphorus and silicon mixture; (2) the amorphous state lithium sulfur phosphorus and silicon mixture is sealed under the atmosphere protection condition; then, the temperature is raised to 100 to 250 DEG C under the vacuum condition; heat treatment is performed; the lithium sulfide series solid electrolyte material is obtained. The concentration of migratable lithium irons in the lithium sulfide series solid electrolyte is improved through adding the high-lithium-content lithium silicon alloy powder capable of easily forming the amorphous state, so that the lithium ion conductivity of the obtained solid electrolyte material is improved.

Description

technical field [0001] The invention relates to a lithium sulfide solid electrolyte material, in particular to a lithium sulfide solid electrolyte material added with lithium-silicon alloy powder and a preparation method thereof. Background technique [0002] Lithium-ion batteries with high voltage and high energy density have been widely used in consumer electronics such as laptop computers and mobile phones. In recent years, lithium batteries with high energy density have shown more and more important market prospects as power batteries for electric vehicles, and have been considered as ideal energy conversion devices for the development of the 21st century. A general lithium-ion battery is composed of a positive electrode, a negative electrode, a diaphragm, an organic electrolyte, and a sealed casing. Major safety accidents such as fires caused by flammable organic electrolytes occur from time to time. Although many studies have greatly improved the performance of tradit...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525B82Y30/00
CPCB82Y30/00H01M10/0525H01M10/0562H01M2300/0091Y02E60/10
Inventor 朱凌云王振宇张天锦
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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