Method for analyzing quality of lithium sulfide in lithium-sulfur electrode

By charging and discharging lithium-sulfur electrodes, the impurity content of lithium sulfide in lithium-sulfur batteries was analyzed using differential and integral methods, which solved the problem of difficult quantitative analysis in the prior art and improved the preparation yield and performance of the batteries.

CN122422752APending Publication Date: 2026-07-17POSCO HLDG INC +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
POSCO HLDG INC
Filing Date
2024-12-16
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies make it difficult to quantitatively analyze trace impurities of lithium sulfide in lithium-sulfur batteries, especially since the contents of Li2CO3 and Li2O affect the preparation yield and performance of solid electrolytes.

Method used

By charging and discharging the lithium-sulfur electrode, data on voltage and capacity changes are obtained. Differential and integral methods are used to analyze the battery capacity under voltage changes and to calculate the content of residual lithium compounds, especially the content of Li2O.

Benefits of technology

This method enables quantitative analysis of trace impurities in lithium sulfide in lithium-sulfur batteries, improving the preparation yield of solid electrolytes and the stability of battery performance.

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Abstract

本发明涉及一种锂硫电极中硫化锂的品质分析方法，作为分析锂硫活性材料中残留锂化合物的方法，所述分析方法包括：准备包括正极活性材料的电极的步骤；对所述电极进行充放电，以获取关于随容量(Specific Capacity)变化的电压(Voltage)的第一数据的步骤；以及基于所述第一数据，通过对随所述电压(V)变化的电池容量(Q)对所述电压(V)的微分值(dQ / dV)进行积分，获取并分析根据计算出的面积值而得到的数据的步骤。
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