LiPF6 has long been the most widely used lithium salt for lithium batteries, but LiPF6 has poor thermal stability and is prone to hydrolysis, which can cause rapid battery capacity degradation and pose a safety hazard.

New lithium salt: lithium bis(fluorosulfonyl)imide is recognised by domestic and international industry experts as a new generation of lithium salt electrolyte material that will replace lithium hexafluorophosphate for electric vehicles and energy storage lithium ion power batteries. As early as 2012, Japan Catalyst has established an industrial manufacturing method for lithium bis(fluorosulfonyl)imide as an electrolyte for lithium-ion rechargeable batteries, and plans to mass-produce it on a large scale.

Advantages

The new electrolyte solute lithium salt LiFSI has far better physical and chemical properties than LiPF6:

1. higher thermal stability - LiFSI has a melting point of 145°C and a decomposition temperature above 200°C

2. better electrical conductivity.

3. better thermodynamic stability - LiFSI electrolyte is very compatible with the two main components of the SEI membrane and will only undergo a substitution reaction with some of its components at 160 °C.

LiFSI makes up for the shortcomings of LiPF6 and is a higher quality electrolyte solute lithium salt.

The country's higher requirements for the energy density and safety of future new energy vehicles will drive electrolyte development in the direction of high voltage and high safety, bringing development opportunities for the higher safety LiFSI. Today, with the rapid expansion of global demand for lithium-ion batteries, the accelerated growth in electrolyte production and sales will certainly drive the use of LIFSI up year on year.

Applications

LiFSI can be used in the following research applications:

As an ionic liquid in gel polymer electrolytes (GPEs) prepared using solution casting technology.

As a non-flammable electrolyte additive for the unique composition of Li-ion batteries.

A solid polymer electrolyte for synthetic lithium batteries.

Used as an electrolyte in primary batteries.

Used as a polymerisation catalyst.

Also used as an antistatic agent in industry.

As the country places higher demands on the safety of future new energy vehicles, LiFSI will have a broad market prospect in the future as an electrolyte solute superior in terms of safety and stability. Stay tuned to UIVChem for high quality Fine Chemicals.