Lithium sulfide solid electrolyte material containing silver iodide and silver bromide and preparation method of lithium sulfide solid electrolyte material

A solid electrolyte, silver bromide technology, applied in solid electrolytes, electrolyte battery manufacturing, non-aqueous electrolytes, etc., can solve the problems of low battery coulombic efficiency, hinder lithium ion passing, difficult to maintain charge-discharge cycle, etc., to improve ion conduction. rate, and the effect of improving ion conductivity

Pending Publication Date: 2017-05-17
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the applicant believes that this invention is a lithium-ion-free and relies on Ag + The conductive solid electrolyte does not increase the diffusion channel of lithium ions by generating a large number of new atomic vacancies so as to achieve the effect of improving the lithium ion conductivity of the sulfide-based solid electrolyte; the silver ion conductive solid prepared by the method described in the invention The electrolyte is not suitable for use as a solid electrolyte between the positive and negative electrodes of an all-solid lithium battery because: Ag + Migration is not accompanied by electrochemical react

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] 1) Preparatory mixing process of sulfide:

[0030] According to mass percentage, weigh 40% of lithium sulfide and 60% of phosphorus sulfide in a glove box with low moisture (≤1ppm) and low oxygen content (≤1ppm) with argon atmosphere protection, and mix them with zirconium dioxide After the balls are matched, they are sealed in a ball mill tank. The mass ratio of the zirconia balls to the mixture in the tank is 2:0.7; the sealed ball mill tank is installed in a planetary high-energy ball mill using a dry premixed ball mill, and the ball milling time is In 5 hours, a lithium-sulfur-phosphorus ternary mixture (LiPS mixture for short) is obtained;

[0031] 2) Secondary high-energy ball milling process:

[0032] In a glove box with safety lights (such as red light) with low moisture (≤1ppm) and low oxygen content (≤1ppm) with argon atmosphere protection, silver iodide powder (particle size) equivalent to 2.5% of the mass of the above LiPS mixture 200-250 mesh) ...

Example Embodiment

[0039] Example 2

[0040] Repeat Example 1, the difference is:

[0041] 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.

[0042] After pressing the solid electrolyte powder prepared in this example into a standard sample, using the CHI660 electrochemical workstation, using the AC impedance method, at room temperature 25°C, the ion conductivity of the sample in this embodiment is measured to be 6.0×10 -4 S / cm.

Example Embodiment

[0043] Example 3

[0044] Repeat Example 1, the difference is:

[0045] 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;

[0046] In step 2), the particle size of silver iodide and silver bromide powder are both 200-250 mesh, the amount of silver iodide powder added is equivalent to 3.5% of the mass of the LiPS mixture, and the amount of silver bromide powder added is equivalent to 2.5% of the mass of the LiPS mixture;

[0047] After pressing the solid electrolyte powder prepared in this embodiment into a standard sample, using the CHI660 electrochemical workstation, using the AC impedance method, at room temperature 25°C, the ion conductivity of the sample in this embodiment is measured to be 6.2×10 -4 S / cm.

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Abstract

The invention discloses a lithium sulfide solid electrolyte material containing silver iodide and silver bromide and a preparation method of the lithium sulfide solid electrolyte material. The preparation method comprises the following steps of (1) weighing 35%-50% of lithium sulfide and the balance of phosphorus sulfide according to mass percents under the condition of atmosphere protection and mixing evenly to obtain a lithium-sulfur-phosphorus ternary mixture; (2) taking the lithium-sulfur-phosphorus ternary mixture, the silver iodide which is equivalent to 2%-6% of the mass of the lithium-sulfur-phosphorus ternary mixture and the silver bromide which is equivalent to 1%-5% of the mass of the lithium-sulfur-phosphorus ternary mixture under the conditions of atmosphere protection and safe red light and carrying out ball-milling to obtain an amorphous lithium-sulfur-phosphorus mixture containing the silver iodide and the silver bromide; and (3) sealing the obtained amorphous lithium-sulfur-phosphorus mixture containing the silver iodide and the silver bromide under the conditions of atmosphere protection and red light, and heating the amorphous lithium-sulfur-phosphorus mixture to 100-200 DEG C under a vacuum condition or the condition of atmosphere protection for thermal treatment. According to the method disclosed by the invention, the ion conductivity of the obtained lithium sulfide solid electrolyte material can be effectively improved.

Description

technical field [0001] The invention relates to a lithium sulfide solid electrolyte material, in particular to a lithium sulfide solid electrolyte material containing silver iodide and silver bromide 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 tr...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0562H01M10/42B82Y30/00
CPCB82Y30/00H01M10/0562H01M10/058H01M10/4235H01M2300/0068Y02E60/10Y02P70/50
Inventor 朱凌云王振宇张天锦
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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