Revisiting the corrosion mechanism of LiFSI based electrolytes in lithium metal batteries

Insights into the solvation chemistry in liquid electrolytes for lithium-based rechargeable batteries

“…One of the most notorious cases is the corrosion of the collector or stainless-steel shell induced by lithium salts such as LiTFSI or LiFSI at high cut-off voltages. [463][464][465][466] Other strategies such as protective coating of collectors or modification of electrolytes need to be adopted to address the corrosion issues, leading to additional cost. Besides, in fluorinated electrolytes, the environmental issues during the manufacture process and their effects on industrial equipment are also important factors for the practical application of electrolytes.…”

Concentrated electrolytes for rechargeable lithium metal batteries

“…Yamada et al also successfully overcame Al corrosion (figure 5(e)) and TM dissolution at high voltage by using a high concentration ester electrolyte LiFSI-1.1 DMC (in mol) [24,31,63]. In addition, Luo et al [64] observed the Al corrosion of 1.0 M and 5.0 M LiFSI in EC/DMC (3:7, v/v) at high voltage and found that anions and solvent molecules in solution were mainly involved in the formation of CIP and AGG at high concentrations, reducing the concentration of free FSIand suppressing Al corrosion. The capacity decay rate in a 4.45 V Li||LiCoO 2 battery is only 0.53%.…”

Recent Achievements on the Liquid Electrolytes for Fast‐Charging Lithium Metal Batteries

“…When Al(TFSI) 3 is dissolved, Al foil will expose fresh Al metal and continually react with LiFSI, leading to the corrosion of Al current collector, which restricts its large-scale application at high voltage. [68][69][70] Fortunately, Al corrosion can be avoided in the high-concentration electrolytes (HCEs). [71][72][73] In HECs, no free solvent is available to dissolve Al foil and the solvents are all coordinated with Li ions.…”