Preparation method for amorphous state sulfide solid electrolyte

A solid electrolyte and sulfide technology, applied in the directions of electrolytes, electrolyte immobilization/gelation, circuits, etc., can solve the problems of low ionic conductivity, easy moisture absorption and hydrolysis, and increase energy consumption, etc. Simple, solve the effect of lower product purity

Inactive Publication Date: 2016-05-04
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium sulfide is generally used as the raw material in the current common synthesis method. Lithium sulfide is expensive and easy to absorb moisture and hydrolyze, which affects the progress of industrialization.
The Chinese patent with the publication number CN1937301A discloses "a sulfide material that can be used as a solid electrolyte for lithium-ion batteries and it

Method used

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  • Preparation method for amorphous state sulfide solid electrolyte
  • Preparation method for amorphous state sulfide solid electrolyte
  • Preparation method for amorphous state sulfide solid electrolyte

Examples

Experimental program
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Effect test

Example Embodiment

[0023] Example 1:

[0024] Lithium metal, elemental sulfur, and phosphorus pentasulfide are weighed in a glove box filled with nitrogen in a molar ratio of 6:3:1, and 0.2333g of lithium metal, 0.5333g of elemental sulfur, and 1.2334g of phosphorus pentasulfide are weighed, and the above raw materials and 36g of zirconia balls Put it into a 100ml zirconia ball mill jar, take it out from the glove box after completely sealing it. Then use a planetary ball mill to mill at 200 rpm for 24 hours to obtain an amorphous sulfide solid electrolyte Li 3 P.S. 4 .

[0025] Press the sample into a disc with a diameter of 15mm and a thickness of about 0.5mm, clamp the disc between the stainless steel discs, apply epoxy glue on the exposed solid electrolyte, and let it stand for 10 minutes until it is cured. Connect the stainless steel sheets at both ends to the positive and negative electrodes respectively, measure the AC impedance diagram on the electrochemical workstation, and calculate...

Example Embodiment

[0033] Example 2:

[0034] Lithium metal, elemental sulfur, and phosphorus pentasulfide are in a molar ratio of 8:4:1. In a glove box filled with argon, weigh 0.2759g lithium metal, 0.6305g elemental sulfur and 1.0936g phosphorus pentasulfide, and oxidize the above raw materials and 36g Put the zirconium balls into a 100ml zirconia ball mill jar, and take it out from the glove box after completely sealing. Then use a planetary ball mill to mill at 200 rpm for 24 hours to obtain an amorphous sulfide solid electrolyte Li 8 P 2 S 9 .

[0035] Press the sample into a disc with a diameter of 15mm and a thickness of about 0.5mm, clamp the disc between the stainless steel discs, apply epoxy glue on the exposed solid electrolyte, and let it stand for 10 minutes until it is cured. Connect the stainless steel sheets at both ends to the positive and negative electrodes respectively, measure the AC impedance diagram on the electrochemical workstation, and calculate the conductivity of...

Example Embodiment

[0037] Example 3:

[0038] Lithium metal, elemental sulfur, and phosphorus pentasulfide are in a molar ratio of 8:4:1. In a glove box filled with nitrogen, weigh 0.2759g lithium metal, 0.6305g elemental sulfur, and 1.0936g phosphorus pentasulfide. The above raw materials and 36g zirconia The balls were put into a 100ml zirconia ball milling jar, completely sealed and taken out from the glove box. Then use a planetary ball mill at 250 rpm for 48 hours to obtain an amorphous sulfide solid electrolyte Li 8 P 2 S 9 .

[0039] Press the sample into a disc with a diameter of 15mm and a thickness of about 0.5mm, clamp the disc between the stainless steel discs, apply epoxy glue on the exposed solid electrolyte, and let it stand for 10 minutes until it is cured. Connect the stainless steel sheets at both ends to the positive and negative electrodes respectively, measure the AC impedance diagram on the electrochemical workstation, and calculate the conductivity of the sulfide solid...

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Abstract

The invention relates to the field of a lithium ion battery and specifically to a preparation method for an amorphous state sulfide solid electrolyte. The preparation method for the amorphous state sulfide solid electrolyte is characterized by comprising the following steps of (1) putting metal lithium, elemental sulfur and phosphorus pentasulfide into an anhydrous and oxygen-free sealed container for mixing; and (2) performing mechanical grinding on the mixed raw materials obtained in the step (1) to obtain the amorphous state sulfide solid electrolyte. According to the preparation method, the proportion of lithium to sulfur to phosphorus can be accurately controlled; the problem of a relatively low purity of the product caused by raw material volatilization existing in a high-temperature solid state method is solved; and meanwhile, the preparation method is rich in raw material sources and simple in process; and the high-purity amorphous state sulfide solid electrolyte can be obtained in one step by a ball milling method.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing an amorphous sulfide solid electrolyte. Background technique [0002] Low energy consumption and environmentally friendly new energy vehicles are the direction of future vehicle development, and power batteries are the key factors affecting the performance of new energy vehicles. The power batteries of existing new energy vehicles usually use organic liquid electrolytes, but they are prone to fire or explosion if used improperly, posing a major safety hazard. All-solid-state batteries use solid electrolytes, and there is no flammable liquid electrolyte, which greatly improves safety. At the same time, all-solid-state batteries have more storage capacity and greater output power. However, the low ionic conductivity of current solid electrolytes hinders the practicality of all-solid-state batteries. [0003] Compared with the oxide solid electrolyte, th...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/002H01M2300/0085H01M2300/0091Y02E60/10
Inventor 于文倩赵成龙李丽王瑛王龙张庆朋陈建伟王超武
Owner SHANDONG YUHUANG NEW ENERGY TECH
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