Electrolyte for Lithium-Ion Batteries: IONEL™ LF-101 Lithium bis(fluorosulfonyl)imide (LiFSI)

  • Main Applications

    Electrolyte for Lithium-ion secondary batteries, Additive for Lithium-ion secondary batteries, Electrolyte for Lithium primary batteries, Electrolyte for other electrochemical devices

  • Applications
  • Functions

Basic Information

IONEL™ is LiFSI used as the electrolyte in Lithium-ion batteries.
Nippon Shokubai developed the mass-production technology for LiFSI using proprietary synthesis and purification techniques for the first time in the world in 2013.
We are accelerating global expansion with local food production and consumption as our basic strategy of IONEL™, in order to meet the rapid growth in demand for lithium-ion batteries due to the rapid spread of electric vehicle.
In addition to current production capacity of 300 tons/year in Japan, we have invested in Hunan Fluopont New Materials Co., Ltd. (production capacity of 1,200 tons /year in 2022 planned to be increased to 12,000 tons/year in 2025) for establishment of a cost-competitive supply system in China.
Moreover, we are considering new locations for manufacturing in North America and Japan.

IONEL™ is highly pure, has few solvents and by-products, and exhibits stable electrochemical properties.
IONEL™ has been adopted and certified by many lithium-ion battery manufacturers in Japan and around the world. It has a wide range of applications including installed in vehicles and used in consumer-use products and stationary equipment.
We have applied for patents suitable for lithium-ion battery applications in Japan and worldwide, and own many patent rights.

IONEL™ complies with laws and regulations in major countries worldwide and has acquired intellectual property rights, so customers can use it with confidence and peace of mind.

Click here for IONEL™ Patent Rights

Molecular Weight 187(g/mol)
CAS No.171611-11-3
Appearance White powder
Purity99.9% min.
Melting Point 140℃
Thermal Decomposition Temperature 300°C min.
SolubilityDissolve 50 wt% min. in DMC and EMC

Features and Properties

Various studies have been conducted on IONEL™ as the main electrolyte salt for lithium-ion batteries, and the following improvements have been confirmed.

• Long life
• Discharge and input/output properties at lower temperatures
• Storage at higher temperatures
Similar effects can be observed when IONEL™ is used as an additive.

chemical structure

Details of Functions

Cycle Life

IONEL™ improves the cycle life at high temperatures. This enables the design of batteries with little capacity loss even at high temperatures, contributing to a longer cycle life of products.

Positive electrodeNMC
Negative electrodeGraphite
Cycle Life at 45℃

Low Temperatures

IONEL™ improves the discharge capacity at low temperatures. This enables the design of batteries with little capacity loss even at low temperatures.

Positive electrodeNMC
Negative electrodeGraphite
Discharge capacity at -20℃

Low Temperature Input/Output

IONEL™ improves the input/output at low temperatures, which is effective in reducing resistance.
This enables the design of safe and highly-flexible batteries without generating dendrites, even at low temperatures.

Positive electrodeNMC
Negative electrodeGraphite
Measured Temperature-20℃
Measurements are made by the external evaluation organization, the Consortium for Lithium Ion Battery Technology and Evaluation Center (LIBTEC).
DCR at-20℃,SOC50%

High Temperature Storage

IONEL™ improves the capacity retention at high-temperature storage. This enables the design of batteries with little capacity loss, even at high temperatures.

Positive electrodeNMC
Negative electrodeGraphite
Measured Temperature60℃
Strorage characterisics at 60℃,SOC100%


IONEL™ Patent Rights