Higher-order polysulfides induced thermal runaway for 1.0 Ah lithium sulfur pouch cells

• DOI: 10.1016/j.partic.2022.11.009
• Publication Date: 2022-12-08T14:59:15Z
• Authors: Feng-Ni Jiang; Shi-Jie Yang; Zi-Xian Chen; He Liu; Hong Yuan; Lei Liu; Jia-Qi Huang; Xin-Bing Cheng; Qiang Zhang
• Keywords: Thermal Runaway; Polysulfide; Exothermic reaction

Comprehensive analyses on thermal runaway mechanisms are critically vital to achieve the safe lithium–sulfur (Li–S) batteries. The reactions between dissolved higher-order polysulfides and Li metal were found be origins for of 1.0 Ah cycled Li–S pouch cells. 16-cycle cell indicates high safety, heating from 30 300 °C without runaway, while with additional electrolyte undergoes severe at 147.9 °C, demonstrating key roles safety On contrary, does not occur 45-cycle despite addition electrolyte. It is that (Li2Sx ≥ 6) discovered in sulfur species Li2Sx ≤ 4. In addition, strong exothermic polysulfide (Li2S6 Li2S8) 153.0 driving This work uncovers potential risks batteries negative shuttle view.