Method for producing high-purity lithium sulfide and sulfide solid electrolyte, and solid-state battery

By introducing sulfur powder into lithium sulfate and a highly reactive carbon source, and combining wet ball milling, spray drying, and deep purification steps, the problem of high impurity content in lithium sulfide preparation was solved, resulting in high-purity lithium sulfide and improving the conductivity and battery performance of the sulfide solid electrolyte.

CN122118100APending Publication Date: 2026-05-29SHENZHEN ZHISHENG ENERGY TECHNOLOGY CO LTD
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN ZHISHENG ENERGY TECHNOLOGY CO LTD
Filing Date
2026-02-09
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In the existing technology, the carbon reduction capacity in the preparation process of lithium sulfide is limited, resulting in a high impurity content, especially the formation of impurities such as lithium oxide and lithium carbonate, which affects the ionic conductivity and battery performance of sulfide solid electrolytes.

Method used

Lithium sulfate, a highly reactive carbon source, and sulfur powder were mixed in deionized water and then wet-milled and spray-dried to form microsphere precursors. These precursors were then subjected to reduction calcination and dissolution evaporation crystallization, followed by deep purification with strontium nitrate to obtain high-purity lithium sulfide.

Benefits of technology

It significantly reduces oxygen and carbon residues in lithium sulfide, improves the purity and conductivity of lithium sulfide, ensures the stability and consistency of mass production, and enhances the electrochemical performance of solid-state batteries.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122118100A_ABST
    Figure CN122118100A_ABST
Patent Text Reader

Abstract

The disclosure provides a preparation method of high-purity lithium sulfide and a sulfide solid-state electrolyte, and a solid-state battery. The preparation method of the high-purity lithium sulfide comprises the following steps: adding lithium sulfate, a high-reactivity carbon source and sulfur powder into water to perform wet ball milling treatment to obtain a homogeneous slurry; performing spray drying treatment on the homogeneous slurry to obtain microsphere precursors; performing reduction calcination treatment on the microsphere precursors to obtain coarse lithium sulfide; dissolving the coarse lithium sulfide in water, filtering and evaporating and concentrating to obtain crystalline lithium sulfide; and performing calcination and crushing on the crystalline lithium sulfide to obtain high-purity lithium sulfide. The introduction of the sulfur powder into the lithium sulfate and the high-reactivity carbon source promotes the deep reduction of sulfate ions, inhibits the generation of side reactions and Li2O, reduces the oxygen content and carbon residues, and obtains lithium sulfide with less oxygen impurities and high purity. Through the combination of wet ball milling and spray drying, the microsphere precursors with uniform composition are obtained, which is beneficial to the subsequent high-temperature solid-phase reaction.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • CN120757130A