Analysis method of cathode used in lithium-sulfur battery

The method of analyzing lithium-sulfur battery electrodes using EA, IC, and ICP-OES with ultrapure water pretreatment addresses the issue of insoluble byproduct accumulation, ensuring less than 20% Li2S2 and Li2S after 100 cycles, enhancing battery performance and design.

KR103001377B1Active Publication Date: 2026-08-05LG ENERGY SOLUTION LTD
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Patent Information

Application Number
KR1020210173961
Authority / Receiving Office
KR · KR
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-12-07
Publication Date
2026-08-05
Estimated Expiration
2041-12-07

AI Technical Summary

Technical Problem

Existing lithium-sulfur batteries face performance degradation due to the accumulation of insoluble lithium sulfides (Li2S2 and Li2S) byproducts, which act as insulators, necessitating an accurate method to analyze their content during charge-discharge cycles.

Method used

A method involving the preparation of a positive electrode sample from a lithium-sulfur secondary battery, followed by elemental analysis (EA), ion chromatography (IC), and inductively coupled plasma optical emission spectrometry (ICP-OES) to determine the composition and byproduct content, with sample pretreatment using ultrapure water to extract insoluble lithium sulfides.

Benefits of technology

Enables accurate measurement of byproduct content, allowing for effective quality control and battery design by ensuring Li2S2 and Li2S are below 20% by weight after 100 cycles, thus mitigating performance degradation.

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Abstract

The present invention provides a method for analyzing a positive electrode used in a lithium-sulfur secondary battery, comprising: (S1) a step of preparing a positive electrode sample by disassembling the battery and separating the positive electrode after charging and discharging a lithium-sulfur secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte in which a lithium salt is dissolved as an electrolyte in an organic solvent, wherein the positive electrode sample is used in a composite of a sulfur (S8)-carbon-based material; (S2) a step of performing EA (elemental analyzer), IC (ion chromatography), and ICP-OES (inductively coupled plasma optical emission spectrometer) analysis on the positive electrode sample, respectively; and (S3) a step of confirming the overall composition of the positive electrode sample and the content of by-products by combining the content of each component measured by each of the respective analyses, wherein in step (S2), the ICP-OES analysis is performed with a solution in which the positive electrode sample is dissolved in ultrapure water.
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