송병헌 (ASTA)

송병헌 (ASTA)

김형진 (GIST)

김현식 (ASTA)

송병헌 (ASTA)

진병권 (ASTA)

지의영 (ASTA)

이용주 (ASTA)

김형진 (GIST)

김현식 (ASTA)

With the advancement of the materials industry, there is a need for simultaneous analysis of various characteristics in high-performance materials. Particularly, for materials comprising parts that require significant thermal stability, such as secondary batteries, it is crucial to analyze the chemical composition of gases generated during physical property changes at high temperatures. The weight reduction of a sample analyzed through Thermogravimetric Analysis (TGA) is a major indicator of its thermal stability, representing thermal properties such as stability, lifetime, and decomposition mechanisms of the analyte. Qualitative and quantitative analysis of gases generated from each thermal decomposition process during TGA analysis can be performed by establishing an integrated system of TGA and Time-of-Flight Mass Spectrometry (TOF-MS). In the case of NCM (Nickel Cobalt Manganese) ternary metal Li-ion battery cathode materials, the higher the proportion of Ni, the weaker the stability becomes. Using TGA TOF-MS, this can be verified through the onset temperatures at which thermal decomposition occurs and the amount of evolved gas. Additionally, the measurement results using LDI TOF-MS also support this finding. Based on thermal decomposition reactions, weight reduction profiles of cathode materials with different Ni content demonstrated varying thermal stability. In our TGA-MS studies, simultaneously measuring the thermal decomposition weight difference and quantifying evolved gases may provide a method to control the stability of secondary battery materials.