Operando Intermittent Extraction Gas Chromatography‐Mass Spectrometry Technology for Gaseous Products Analysis of Li‐Ion Pouch Cell

作者：Jiyuan Xue, Weichao Tu, Yuan Tian, Haiyan Luo, Yeguo Zou, Yuhao Hong, Jinzhi Wang, Niu Liu, Haitang Zhang, Xin Sun, Yu Qiao, Shi‐Gang Sun · 发表于：Advanced Energy Materials · 年份：2025 · DOI：10.1002/aenm.202502378 · 被引用次数：10 · 研究领域：Advanced Battery Technologies Research、Advancements in Battery Materials、Advanced Battery Materials and Technologies

Abstract As for the monitoring of gaseous products in Li‐ion batteries, typical differential/on‐line electrochemical mass spectrometry (DEMS/OEMS) characterizations are constrained by inherent limitations, e.g., interference/incompatibility against practical electrochemical long‐term cycling and distortion of product recognition. More critically, DEMS/OEMS exhibits restricted gas monitoring capability, especially as it is inadequate for high specific energy battery systems with increasingly complex side‐reactions and gaseous products evolution. To address these limitations, an operando intermittent extraction gas chromatography‐mass spectrometry (OIE‐GC‐MS) system is developed for a practical pouch‐type cell, equipped with a featured intermittent extraction mode and parallel mass spectrometry (MS) and gas chromatography‐mass spectrometry (GC‐MS). This approach enables full‐dimensional gas evolution monitoring under realistic long‐term cycling conditions across a varying temperature field. Notably, the GC‐MS characterization resolves gaseous products through chromatographic separation, thereby elucidating obscured reaction mechanisms, especially complicated crosstalk/consumption reactions during long‐term cycling. The OIE‐GC‐MS system presents the capability for high‐throughput characterization, achieving an enhancement in product analysis efficiency. The system provides significant insights into the complex reactions leading to battery degradation, establishing a protocol for...