Thermal Runaway Characteristics and Gas Composition Analysis of Lithium-Ion Batteries with Different LFP and NCM Cathode Materials under Inert Atmosphere

During thermal runaway (TR), lithium-ion batteries (LIBs) produce a large amount of gas, which can cause unimaginable disasters in electric vehicles and electrochemical energy storage systems when the fail subsequently combust or explode. Therefore, to systematically analyze post-thermal characteristics commonly used LIBs with LiFePO4 (LFP) LiNixCoyMnzO2 (NCM) cathode materials maximize situ gas generation during battery runaway, we designed experiments using an adiabatic explosion chamber (AEC) under inert atmosphere test LIBs. Additionally, conducted analysis components produced runaway. Our research findings indicate that after NCM more than LFP batteries. Based on production, degree harm caused by TR be ranked as follows: NCM9 0.5 > NCM811 NCM622 NCM523 LFP. The primary for both include H2,CO,CO2,C2H4, CH4. contains high proportion H2. concentration H2 results lower flammability limit (LFL) generated compared mixed terms composition, order hazard level is 0.5. Although experimental show have superior stability production large-scale events, considering composition products, risk may higher are considered very safe, our once again drawn researchers’ attention These gases also serve detection signals warnings, providing cautionary note future development renewable sector.