A very promising second generation electrolyte material——Lithium Bis(fluorosulfonyl)imide


Due to multiple factors such as slowing downstream market demand and a substantial increase in supply capacity, the price of electrolyte materials has continued to remain low. Data shows that the price of Lithium Hexafluorophosphate (LiPF6), a key solvent in electrolyte, has been below RMB90,000 per ton since falling from an elevated level of around RMB600,000 per ton. According to data from Shanghai Nonferrous Metals News (SMM), the average price of Lithium Hexafluorophosphate was RMB8.23 per ton on July 4th, with a nearly 80% decline from its historical high.

It is worth noting that, while the market for lithium hexafluorophosphate is at its lowest point, the capacity expansion and market introduction process of LIFSI, a superior electrolyte solvent material, is progressing at an increasingly fast pace.

"Compared to lithium hexafluorophosphate, which is currently widely used in lithium batteries, LIFSI has better electrochemical properties, resistance to water decomposition, thermal stability, and conductivity," said relevant personnel from Meisenbao Technology's R&D department. Currently, this new lithium salt is mainly used as an additive in electrolyte, but it can also be used as a solvent solute alone, making it a highly promising second-generation electrolyte material.

At present, new energy batteries are accelerating their evolution towards high energy density, high safety, and ultra-fast charging. From a technical trend perspective, as a new type of electrolyte solvent, Lithium bis(fluorosulfonyl)imide is more in line with the future development direction of high-performance, wide-temperature and high-safety lithium batteries, and is expected to become an alternative to Lithium hexafluorophosphate to improve its defects, which conforms to the future trend of electrolyte development.

For example, in the fast-charging field, which is currently the focus of many battery manufacturers, Lithium bis(fluorosulfonyl)imide will play its unique assistant role. Industry insiders pointed out that in the conventional electrolyte solution with ester organic solvent, the electrolyte solution containing Lithium bis(fluorosulfonyl)imide has higher conductivity than the one containing other lithium salts, and its fluorine content is lower, which is more environmentally friendly.

"Therefore, Lithium bis(fluorosulfonyl)imide is regarded as the most promising alternative to Lithium hexafluorophosphate, especially in the field of fast-charging batteries. Thanks to the synergistic effect between different lithium salts, using a lithium salt mixture as an electrolyte also improves the fast-charging ability of graphite." The industry insider pointed out.

However, due to the high technical difficulty of Lithium bis(fluorosulfonyl)imide, there are relatively fewer manufacturers producing it at present, and it is mainly concentrated in the production of a few leading companies. The equipment used to produce Lithium bis(fluorosulfonyl)imide requires certain resistance to corrosion, and the raw materials used will also need to be adjusted accordingly. In terms of manufacturing processes, the main domestic method is the three-step method, with high requirements for yield in the process flow.

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