FPTI additive developed to extend the lifespan of lithium-ion batteries

Scientists in Japan have synthesized a new chemical compound that significantly increases the durability of lithium-ion batteries, ensuring that 95.6 percent of their capacity is retained after a thousand charge cycles.

Research Team and Published Study

A research team led by Professor Matsumi, conducting studies within the Japan Advanced Institute of Science and Technology, has developed a new method to extend battery lifespans.

The study in question was published in the academic journal Energy & Fuels, making waves in the scientific world and opening the door to a new era in lithium-ion technology.

Functionality of the FPTI Additive

The developed fluorinated additive is called pentafluorophenyl thiophene imine, or FPTI for short.

This special compound prevents side reactions by strengthening the protective solid electrolyte interphase layer on the graphite anode surface during the initial charge cycles.

Resistance Reduction and Performance

The FPTI component successfully reduces the solid electrolyte interphase film resistance from 7.6 ohms down to 2.2 ohms.

Thanks to this drop in resistance, lithium ions are supported in diffusing much more smoothly and continuously inside the cell.

Charge Tests and Capacity Retention

In tests conducted with an FPTI concentration of four milligrams per millilitre, graphite batteries managed to retain 95.6 percent of their capacity even after a thousand cycles.

In contrast, standard control samples containing no additive showed only 62.7 percent capacity retention and experienced severe degradation after approximately 350 cycles.

Energy Density and Pre-treatment Process

Scientists pre-treated the graphite anodes with FPTI during the initial testing phase before combining them with standard electrolytes.

Through this applied method, the finished battery cell achieved an energy density of approximately 233 watt-hours per kilogram.