High safety separators for rechargeable lithium batteries

摘要

Lithium-ion batteries(LIBs)are presently dominant mobile power sources due to their high energy density,long lifespan,and low self-discharging rates.The safety of LIBs has been concerned all the time and become the main problem restricting the development of high energy density LIBs.As a significant part of LIBs,the properties of separators have a significant effect on the capacity and performances of batteries and play an important role in the safety of LIBs.In recent years,researchers devoted themselves to the development of various multi-functional safe separators from different views of methods,materials,and practical requirements.In this review,we mainly focus on the recent progress in the development of high-safety separators with high thermal stability,good lithium dendritic resistance,high mechanical strength and novel multifunction for high-safety LIBs and have in-depth discussions regarding the separator''s significant contribution to enhance the safety and performances of the batteries.Furthermore,the future directions and challenges of separators for the next-generation high-safety and high energy density rechargeable lithium batteries are also provided.