The LiFSI (Lithium bis(fluorosulfonyl)imide) salt, F2LiNO4S2, is a next-generation electrolyte salt that is rapidly gaining prominence in high-performance lithium-ion batteries (LIBs). It is often considered the most promising candidate to supplement or eventually replace the conventional LiPF6. 

LiFSI provides several significant improvements over the standard LiPF6:

(1) Superior Ionic Conductivity: LiFSI-based electrolytes often exhibit higher ionic conductivity than LiPF6 at room and low temperatures. This is a crucial factor for achieving fast-charging capabilities and excellent performance in cold environments.

(2) High Thermal Stability: It has excellent thermal stability, with a decomposition temperature generally above 200 °C (compared to 70-80 °C for LiPF6). This property significantly enhances the safety and reliability of the battery under high-temperature operation.

(3) Enhanced Hydrolysis Resistance: LiFSI is less sensitive to moisture than LiPF6. While it still reacts with water, it does not produce the highly corrosive and toxic HF (Hydrofluoric Acid) as readily, leading to better long-term stability and cycle life.

(4) Compatibility with Li Metal: LiFSI is a critical component in electrolytes designed for lithium metal anodes (next-generation batteries) as it can help promote dendrite-free lithium plating.

Notes: Please store the LiFSI liquid electrolyte in the glovebox due to its sensitivity to humidity.

References: 

1. K. S. Jiang, et al. Probing the Functionality of LiFSI Structural Derivatives as Additives for Li Metal Anodes, ACS Energy Lett. 2022, 7, 10, 3378–3385.
2. G. Yang, et al. LiFSI to improve lithium deposition in carbonate electrolyte, Energy Storage Materials, 2019, 23, 350-357.