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LiFSI (Lithium bis(fluorosulfonyl)imide) is a new type of electrolyte lithium salt. Due to its outstanding performance and broad application prospects, it is gradually becoming a research focus in the field of lithium battery electrolytes. Compared to LiPF6 (Lithium hexafluorophosphate), LiFSI has significant advantages in terms of higher conductivity, better thermal stability, and superior performance at low temperatures.

In terms of conductivity, LiFSI generally outperforms LiPF6, especially under low-temperature conditions, where it provides better interface stability and reduces the degradation of electrode materials. While LiPF6 offers good conductivity at room temperature, its performance declines at lower temperatures.

Regarding thermal stability, LiFSI remains relatively stable under high-temperature conditions and is less prone to decomposition, with a decomposition temperature ranging between 220-240°C, thereby reducing the safety risks associated with overheating. In contrast, LiPF6 has a lower decomposition temperature of around 80°C and tends to release HF in the presence of moisture, leading to potential safety issues.

In summary, there are significant differences between LiFSI and LiPF6 in various aspects. With the advancement of battery technology, LiFSI may see increased usage in high-performance and high-safety applications.