Preparation method of argyrodite type sulfide solid electrolyte

A technology of solid-state electrolyte and silver-silver-germanium ore, which is applied in the field of lithium-ion batteries, can solve the problems of low ionic conductivity of solid-state electrolytes, easy adhesion on the tank wall and the surface of the ball, and failure to obtain the expected crystal phase, so as to reduce the escape of CO2 , avoid uneven mixing of materials, and avoid the effect that solvents are difficult to remove

Active Publication Date: 2021-08-31
湖南恩捷前沿新材料科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology involves making sulphoferrite solid elecrosists that have improved performance compared to existing methods such as lithium nitride batteries due to reduced costs associated with their manufacturing processes. Additionally, this new type of battery also exhibits higher levels of electrical conduction than previous types without adding expensive chemicals like cobalt powder.

Problems solved by technology

This patented technical problem addressed by this patents relates to developing an effective way to prepare sulfurous solids (such as selenite) from readily available starting material sources such as sodium or calcium chlorides without compromising their properties during manufacturing processes like thermal treatments.

Method used

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  • Preparation method of argyrodite type sulfide solid electrolyte

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Effect test

Embodiment 1

[0027] Weigh 2N pure reagent Li according to stoichiometric ratio 5:2:6:2 2 o 2 , P, CS 2 and LiCl, put them into a zirconia ball mill tank with an air valve in turn, add zirconia balls with a ball-to-material ratio of 40:1, seal the ball mill tank and evacuate it, the vacuum degree is 6 P.S. 5 Cl solid electrolyte powder. figure 1 is the XRD spectrum of the solid electrolyte powder. Press the solid electrolyte powder under a pressure of 200Mpa and hold the pressure for 3 minutes to obtain a solid electrolyte sheet. The whole process was carried out under an argon protective atmosphere. The lithium electrical conductivity of the solid electrolyte sheet at room temperature is 3.2×10 -3 S cm -1 .

Embodiment 2

[0029] Weigh 2N pure reagent Li according to stoichiometric ratio 5:2:5:2 2 o 2 , P, CS 2 and LiCl, put them into the zirconia ball mill tank with air valve in turn, add zirconia balls with a ball-to-material ratio of 30:1, seal the ball mill tank and evacuate it, the vacuum degree is 6 P.S. 5 Cl solid electrolyte powder. Press the solid electrolyte powder under a pressure of 200Mpa and hold the pressure for 3 minutes to obtain a solid electrolyte sheet. The whole process was carried out under an argon protective atmosphere. The lithium electrical conductivity of the solid electrolyte sheet at room temperature is 3.5×10 -3 S cm -1 .

Embodiment 3

[0031] Weigh 2N pure reagent Li according to stoichiometric ratio 5:1:6:2 2 O.P 2 o 5 、CS 2 and LiCl, put them into a zirconia ball mill tank with an air valve in turn, add zirconia balls with a ball-to-material ratio of 40:1, seal the ball mill tank and evacuate it, the vacuum degree is 6 P.S. 5 Cl solid electrolyte powder. figure 1 is the XRD spectrum of the solid electrolyte powder. Press the solid electrolyte powder under a pressure of 200Mpa and hold the pressure for 3 minutes to obtain a solid electrolyte sheet. The whole process was carried out under an argon protective atmosphere. The lithium electrical conductivity of the solid electrolyte sheet at room temperature is 1.3×10 -3 S cm -1 .

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Abstract

The invention discloses a preparation method of a sulfide solid electrolyte, and the method combines wet ball milling and solid ball milling by taking CS2 as a raw material and a solvent. According to the invention, cheap Li2O2 or Li2O, P or P2O5, CS2 and LiX (X is Cl, Br or I) are used as raw materials, use of expensive Li2S is avoided, the solid electrolyte is prepared by adopting a method of combining reduced pressure wet ball milling and solid phase ball milling, CS2 is a raw material and a solvent, the reaction activity of the raw material is strong, the utilization rate is high, the preparation method is simple, high-temperature sintering is not needed, and the preparation method is suitable for industrial production. The prepared argyrodite type solid electrolyte has relatively high ionic conductivity and a relatively wide electrochemical window, and has high safety, high energy density and excellent cycling stability when being applied to preparation of all-solid-state batteries.

Description

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Claims

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Application Information

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Owner 湖南恩捷前沿新材料科技有限公司
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