The article "Designing Nonflammable Liquid Electrolytes for Safe Li-Ion Batteries" by Jing Xie and Yi-Chun Lu reviews the current understanding of safety issues in Li-ion batteries and discusses advanced strategies for designing nonflammable liquid electrolytes. The authors highlight the importance of gaining comprehensive insights into nonflammability design to inspire more efficient approaches for building safer Li-ion batteries. They cover various aspects, including the mechanistic understanding of safety hazards, molecular design, solvation structure, and battery compatibility. The review also discusses typical safety tests, such as flammability tests, calorimetric tests, noncalorimetric characterizations, and abuse tests, to provide a reliable evaluation of battery safety. Finally, the challenges and perspectives in the development of nonflammable liquid electrolytes are summarized, emphasizing the need for deeper mechanistic studies, environmental and economic considerations, and comprehensive safety tests.The article "Designing Nonflammable Liquid Electrolytes for Safe Li-Ion Batteries" by Jing Xie and Yi-Chun Lu reviews the current understanding of safety issues in Li-ion batteries and discusses advanced strategies for designing nonflammable liquid electrolytes. The authors highlight the importance of gaining comprehensive insights into nonflammability design to inspire more efficient approaches for building safer Li-ion batteries. They cover various aspects, including the mechanistic understanding of safety hazards, molecular design, solvation structure, and battery compatibility. The review also discusses typical safety tests, such as flammability tests, calorimetric tests, noncalorimetric characterizations, and abuse tests, to provide a reliable evaluation of battery safety. Finally, the challenges and perspectives in the development of nonflammable liquid electrolytes are summarized, emphasizing the need for deeper mechanistic studies, environmental and economic considerations, and comprehensive safety tests.