Lithium Bis(fluorosulfonyl)imide（LiFSI ）

  • Product Name: ‌Lithium Bis(fluorosulfonyl)imide
  • Short Name: LiFSI
  • Appearance: white crystal or powder
  • Purity: ≥99.9%
  • CAS No: 171611-11-3
  • HS Code: 2921199090
  • MF: F2LiNO4S2
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‌Lithium Bis(fluorosulfonyl)imide (LiFSI) is a new type of lithium salt with excellent electrochemical properties, hydrolysis resistance, thermal stability and conductivity‌. It is mainly used as an additive in electrolytes, and can also be used alone as an electrolyte. LiFSI is considered to be a substitute for lithium hexafluorophosphate (LiPF6) and has broad prospects for future development. With the sharp increase in demand for lithium hexafluorophosphate and a sharp rise in prices, the cost-effectiveness of lithium bis(fluorosulfonyl)imide has become more prominent, and the demand has also continued to rise.

Why Lithium Bis(fluorosulfonyl imide) has Become A New Electrolyte Additive

The melting point of lithium bis(fluorosulfonyl imide) is between 140 and 145°C. It not only has excellent conductivity (ionic conductivity up to 8mS/cm), but also has excellent thermal stability. When it is added to the electrolyte, it can coexist harmoniously with the positive and negative electrode materials, showing many advantages, thus complying with the trend of high nickel content in the positive electrode ternary materials of power lithium batteries.

In addition, LiFSI also has excellent electrochemical stability and can work continuously and stably under high voltage conditions, providing strong support for power batteries and high-end consumer electronic products. It can not only improve the ion migration and electrochemical reflection kinetics of lithium batteries under low temperature conditions, improve the power output and charge and discharge performance under low temperature, but also effectively improve the safety of lithium batteries under high temperature conditions and extend the cycle life of batteries.

What Are Main Application of LiFSI

  • (1) Lithium-ion battery electrolyte additive. As an additive in lithium-ion battery electrolyte, LiFSI can significantly reduce the high and low temperature resistance of the SE layer formed on the surface of the electrode plate at low temperatures, thereby reducing the capacity loss of lithium batteries during storage, improving the battery capacity and electrochemical performance of the battery. It can also significantly improve the cycle performance and rate performance of lithium-ion batteries, while inhibiting battery expansion and extending service life. It is suitable for various types of lithium batteries such as lithium-ion batteries, lithium-sulfur batteries, and lithium-air batteries, providing long-lasting and stable power support for various electronic devices.
  • (2) Electrolyte for primary batteries. In addition to being an additive, LiFSI can also be used directly as an electrolyte for primary batteries, providing a stable ion conduction environment for the battery, providing higher energy density and better safety.
  • (3) Polymerization catalyst. In the chemical industry, LiFSI can also be used as a catalyst for polymerization reactions and is used in various organic synthesis reactions. Its unique properties can promote the reaction, thereby increasing the speed and yield of the reaction. It can also be used in hydrogenation and oxidation reactions, so it is also widely used in fields such as pharmaceutical chemistry and agricultural chemistry.
  • (4) Other industrial fields. Due to its unique chemical properties, LiFSI is also widely used in the industrial field, such as as a raw material for special chemicals.

Mechanism Action of Lithium Bis(fluorosulfonyl)imide (LiFSI)in Lithium Batteries

In lithium batteries, lithium bis(fluorosulfonyl)imide mainly undertakes the task of ion conduction. When the battery is charged and discharged, lithium ions (Li+) move between the positive and negative electrodes, and LiFSI acts as an electrolyte lithium salt to provide a transmission channel for lithium ions. Through efficient ion conduction, lithium bis(fluorosulfonyl)imide ensures that lithium batteries can charge and discharge quickly while maintaining stable performance.

The excellent properties of LiFSI electrolyte have an important impact on the overall performance of lithium batteries. First, its high ionic conductivity helps to improve the charging and discharging speed and energy density of the battery. Second, its good chemical stability and thermal stability enable lithium batteries to maintain stable operation under high temperature or harsh environment. Finally, the low solubility of lithium bis(fluorosulfonyl)imide LiFSI helps to reduce the self-discharge phenomenon inside the battery, thereby extending the service life of the battery.

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