Thermally Stable Polymer-Rich Solid Electrolyte Interphase for Safe Lithium Metal Pouch Cells

Shi Jie Yang, Nan Yao, Feng Ni Jiang, Jin Xie, Shu Yu Sun, Xiang Chen, Hong Yuan, Xin Bing Cheng, Jia Qi Huang, Qiang Zhang

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

Serious safety risks caused by the high reactivity of lithium metal against electrolytes severely hamper the practicability of lithium metal batteries. By introducing unique polymerization site and more fluoride substitution, we built an in situ formed polymer-rich solid electrolyte interphase upon lithium anode to improve battery safety. The fluorine-rich and hydrogen-free polymer exhibits high thermal stability, which effectively reduces the continuous exothermic reaction between electrolyte and anode/cathode. As a result, the critical temperature for thermal safety of 1.0 Ah lithium-LiNi0.5Co0.2Mn0.3O2 pouch cell can be increased from 143.2 °C to 174.2 °C. The more dangerous “ignition” point of lithium metal batteries, the starting temperature of battery thermal runaway, has been dramatically raised from 240.0 °C to 338.0 °C. This work affords novel strategies upon electrolyte design, aiming to pave the way for high-energy-density and thermally safe lithium metal batteries.
Original languageEnglish (US)
JournalAngewandte Chemie - International Edition
Volume61
Issue number51
DOIs
StatePublished - Dec 19 2022
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • Catalysis

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