A silver chloride-containing lithium sulfide solid electrolyte material and preparation method thereof

A solid electrolyte and lithium sulfide technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as high material content, hinder lithium ion diffusion, and reduce lithium sulfide component content, so as to improve ion conductivity and stabilize Solid electrolyte matrix, the effect of improving ion conductivity

Active Publication Date: 2018-08-21
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The improvement of the ionic conductivity of the solid electrolyte obtained by the invention is also not ideal, and its total conductivity at room temperature is also at 10 -6 S / cm
According to the analysis of the applicant, the reasons for the unsatisfactory improvement of the ion conductivity of the solid electrolyte obtained by the above-mentioned invention patent are mainly: (1) the added substance (such as iodide or sulfide, etc.) is a stable hexagonal crystal or orthorhombic crystal, It cannot react with surrounding substances, and cannot introduce more atomic vacancies into the system, and cannot provide more diffusion channels for the diffusion of lithium ions; (2) The content of added substances is too high, on the one hand, it reduces the capacity of lithium ion carriers. On the other hand, high-content, stable additives not only did not increase the lithium ion diffusion channels in the solid electrolyte, but hindered the diffusion of lithium ions
At present, there is no report on adding silver chloride to lithium sulfide solid electrolyte materials to improve their ion conductivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Sulfide preparation mixing process:

[0028] By mass percent, take by weighing 40% lithium sulfide and 60% phosphorus sulfide in the glove box with argon atmosphere protection of low moisture (≤1ppm), low oxygen content (≤1ppm), and mix with zirconium dioxide After the balls are matched, they are sealed into a ball mill jar, and the mass ratio of the zirconia balls in the jar to the mixture is 2:0.7; the sealed ball mill jars are packed in a planetary high-energy ball mill and pre-mixed by a dry ball mill, and the milling time is After 5 hours, a ternary mixture of lithium sulfur and phosphorus (LiPS mixture for short) was obtained;

[0029] 2) Second high energy ball milling process:

[0030] In a glove box protected by an argon atmosphere with low moisture (≤1ppm) and low oxygen content (≤1ppm) with safe lights (red light), silver chloride powder (particle size) equivalent to 2.5% of the mass of the above LiPS mixture 200 mesh) mixed with LiPS mixture by hand, an...

Embodiment 2

[0038] Repeat Example 1, the difference is:

[0039] In step 1), the mass percentages of lithium sulfide and phosphorus sulfide are 50% and 50% respectively, and the ball milling time is 10 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 4.4×10 at a room temperature of 25° C. -4 S / cm.

Embodiment 3

[0042] Repeat Example 1, the difference is:

[0043] In step 1), the mass percentages of lithium sulfide and phosphorus sulfide are respectively 50% and 50%, and the time of ball milling is 2 hours;

[0044] In step 2), the particle size of the silver chloride powder is 200-300 mesh, and the addition amount of the silver chloride powder is equivalent to 5% of the mass of the LiPS mixture;

[0045] 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. by using a CHI660 electrochemical workstation by AC impedance method at room temperature of 5.2×10 -4 S / cm.

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Abstract

The invention discloses a lithium sulfide system solid electrolyte material containing silver chloride and a preparation method thereof. The preparation method comprises the following steps: 1) weighing 35 to 50% of lithium sulfide and the balance of phosphorus sulfide according to mass percentage under protective atmosphere condition and evenly mixing to obtain a lithium sulfur phosphorus ternary mixture; 2) taking the lithium sulfur phosphorus ternary mixture and the silver chloride under protective atmosphere and safe red light condition and arranging in a ball milling tank to be ball milled to obtain an amorphous-state lithium sulfur phosphorus mixture containing the silver chloride, wherein the silver chloride is 2 to 10% of the mass of the lithium sulfur phosphorus ternary mixture; 3) sealing the obtained amorphous-state lithium sulfur phosphorus mixture of the silver chloride under the protective atmosphere and red light condition and warming to 60 to 150 DEG C under vacuum or protective atmosphere condition to perform thermal treatment to obtain the lithium sulfide system solid electrolyte material containing the silver chloride. The lithium sulfide system solid electrolyte material prepared through the preparation method disclosed by the invention can form a lot of atom vacancy which can be applied to lithium ion diffusion and further effectively improves ionic conduction performance of lithium sulfide system solid electrolyte.

Description

technical field [0001] The invention relates to a lithium sulfide solid electrolyte material, in particular to a silver chloride-containing lithium sulfide solid electrolyte material 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 traditional lithium...

Claims

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Application Information

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Patent Type & Authority Patents(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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