Dendrite inhibited and dead lithium activated dual-function additive for lithium metal batteries

In this study, 2-fluoro-5-iodopyridine (2-F-5-IPy) was used as an electrolyte additive, which can not only protect the negative electrode effectively by forming a stable SEI, but also convert dead lithium into active lithium. Benefits from this are a capacity retention of a Li||LiFePO4 cell after 300 cycles from 36.5% to 89.4%, and the symmetrical cell can work stably for more than 800 hours. Therefore, the addition of 2-F-5-IPy can effectively improve the performance of lithium metal batteries. In addition to the role as an anode protection additive, 2-F-5-IPy can also effectively reactivate dead lithium and reduce the consumption of active lithium.

Automated summary

In this study, 2-fluoro-5-iodopyridine (2-F-5-IPy) was used as an electrolyte additive to protect the negative electrode and convert dead lithium into active lithium. The addition of 2-F-5-IPy resulted in a capacity retention improvement from 36.5% to 89.4% after 300 cycles for Li||LiFePO4 cell, and stable operation for over 800 hours for the symmetrical cell. Therefore, 2-F-5-IPy effectively enhances the performance of lithium metal batteries by acting as an anode protection additive and reactivating dead lithium.