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

A solid electrolyte, lithium-silicon alloy technology, applied in the direction of circuits, electrical components, secondary batteries, etc., to achieve the effect of high lithium ion conductivity

Inactive 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 the negative electrode materials of thermal batteries, lithium-ion batteries, lithium-ion capacitors, lithium-sulfur batteries, and lithium-air batteries to accept the intercalation of lithium ions during the charging process, and does not involve simultaneous charging. Adding lithium-silicon alloy powder and silver iodide to improve lithium-ion conductivity of solid electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Mixed high energy ball milling process:

[0030] 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 ratio of 0.05 is mixed, mixed with zirconia balls with a diameter of 3-10mm, and then sealed into a ball mill tank. The mass ratio of the zirconia balls in the tank to the mixture is 2:0.75; the sealed ball mill cans Dry mixing ball milling is adopted in a planetary high-energy ball mill, and the ball milling time is 5 hours to obtain a mixture of lithium sulfur phosphorus silicon;

[0031] 2) Second high energy ball milling process:

[0032] In a glove box protected by an argon atmosphere with low moisture (≤1ppm) and low oxygen content (≤1ppm) with safe lights (such as red light), put silver iodide powder equivalent to 2.5% of the mass of the above lithium sulfur phosphorus silicon mixture...

Embodiment 2

[0040] Repeat Example 1, the difference is:

[0041] In step 1), lithium sulfide, phosphorus sulfide, lithium-silicon alloy and sulfur powder are mixed in a molar ratio of 3:1:0.1:0.05, and the mass ratio of zirconia balls to the mixture is 2:1. Ball milling time is 12 hours;

[0042] In step 2), the particle size of the silver iodide powder is 250 to 300 mesh, and the addition amount of the silver iodide powder is equivalent to 3% of the mass of the lithium sulfur phosphorus silicon mixture;

[0043] In step 3), the heat treatment is carried out at 180° C., and the heat treatment time is 2 hours.

[0044] 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 to be 7.2×10 by using the AC impedance method at a room temperature of 25°C using a CHI660 electrochemical workstation. -4 S / cm.

Embodiment 3

[0046] Repeat Example 1, the difference is:

[0047] In step 1), lithium sulfide, phosphorus sulfide, lithium-silicon alloy and sulfur powder are mixed in a molar ratio of 3:0.75:0.15:0.1, and the mass ratio of zirconia balls to the mixture is 2:0.5. Ball milling time is 8 hours;

[0048] In step 2), the particle size of the silver iodide powder is 250 to 300 meshes, and the amount of the silver iodide powder added is equivalent to 5% of the mass of the lithium sulfur phosphorus silicon mixture;

[0049] In step 3), after sealing, heat treatment at 200° C. for 4 hours under vacuum condition;

[0050] 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 8.2×10 by using the AC impedance method at a room temperature of 25°C using a CHI660 electrochemical workstation. -4 S / cm.

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Abstract

The invention discloses a lithium sulfide series solid electrolyte material added with lithium silicon alloy and silver iodide and a preparation method thereof. The preparation method comprises the following steps that (1) under the atmosphere protection condition, lithium sulfide, phosphorus sulfide, 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 a lithium sulfur phosphorus and silicon mixture; (2) under the conditions of atmosphere protection and safe red light, the lithium sulfur phosphorus and silicon mixture and the silver iodide accounting for 1 to 5 percent of the mass of the lithium sulfur phosphorus and silicon mixture are taken to be put into a ball milling tank and are subjected to ball milling to obtain an amorphous state lithium sulfur phosphorus and silicon mixture containing the silver iodide; (3) the obtained amorphous state lithium sulfur phosphorus and silicon mixture containing the silver iodide is sealed under the atmosphere protection condition; then, the temperature is raised to 120 to 200 DEG C under the vacuum condition; heat treatment is performed; the lithium sulfide series solid electrolyte material is obtained. The lithium ion conductivity of the obtained solid electrolyte material can be improved through simultaneously adding the lithium silicon alloy and the silver iodide.

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 and silver iodide 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 performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0562
CPCH01M10/0525H01M10/0562Y02E60/10
Inventor 朱凌云王振宇张天锦
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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