Comparative study on the thermal runaway characteristics of Li(NixCoyMnz)O2 batteries

作者：Ningning Wei, Fengqin Zhang, Wei Zhang, Xin Li · 发表于：Heliyon · 年份：2024 · DOI：10.1016/j.heliyon.2024.e31203 · 被引用次数：18 · 研究领域：Advanced Battery Technologies Research、Advanced Battery Materials and Technologies、Advanced battery technologies research

Lithium-ion batteries (LIBs) generate substantial gas during the thermal runaway (TR) process, presenting serious risks to electrochemical energy storage systems in case of ignition or explosions. Previous studies were mainly focused on investigating the TR characteristics of Li(Ni x Co y Mn z )O 2 batteries with different cathode materials, but they were conducted in isolation. In this study, the thermal runaway characteristics of prismatic cells that use Li(Ni x Co y Mn z )O 2 (with x ranging from 0.33 to 0.9) cathode materials in an inert environment, which are commonly used or proposed for energy storage applications, are examined. The findings of this research show that the normalized gas generation rate remains consistent, regardless of the battery capacity or experimental chamber volume, with a value of 0.1 ± 0.03 mol∙Ah ⁻1 . High-capacity cells have short jetting durations, and a high nickel content leads to increased mass loss rates. The flammability limits of the gases expelled during thermal runaway, represented by the lower flammability limit (LFL), remain stable at 8 ± 1.8% with minimal variations. However, the upper flammability limit (UFL) varies significantly, ranging from 30% to 60%. Increasing the battery capacity or reducing the experimental chamber volume increases the explosion index. The explosive, combustibility, and jetting duration characteristics of the emitted gases from five different battery chemical compositions provide valuable insights for risk...