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Reprinted-New breakthrough in lithium battery safety: new TFEP electrolyte significantly reduces the risk of fire
Views: 0 Author: Site Editor Publish Time: 2020-03-31 Origin: Site
Lithium-ion batteries are widely used in all aspects of electric vehicles and smart phones. Manufacturers also attach great importance to battery safety while pursuing higher performance. Recently, Japanese scientists have proposed a new electrolyte composition that can improve battery safety at higher voltages.
The research was carried out by a scientific team at the University of Tokyo (UT), which focused on the electrolyte portion of the battery. This solution can carry lithium ions back and forth between the battery's electrodes during charging and discharging, and achieves safe, highly stable operation and high voltage by replacing the solvents used in mainstream batteries, and its performance is better than most existing lithium batteries .
Professor Toshio Yamada, a researcher at the University of Tokyo, said:\"The voltage of a battery is mainly limited by the electrolyte material. Currently, the electrolyte solvent in lithium-ion batteries still uses the solvent that was just commercialized in the early 1990s. So we found an improved method. Our new fluorinated cyclic phosphate solvent (TFEP) electrolyte greatly improves existing ethylene carbonate (EC). \"It is understood that the team designed its cyclic phosphate-based electrolyte by fusing the chemical structure of a conventional electrolyte solvent EC and a flame retardant. This provides the phosphate characteristics of two molecules, including the high pressure resistance of the solvent and the non-flammability of the flame retardant, thereby minimizing the risk of lithium battery fire.When synthesizing the electrolyte, the researchers found that the most effective formula contained 0.95 M LiN (SO2F) 2 in TFEP / 2,2,2-trifluoroethyl methyl carbonate. This specific composition can synthesize an electrolyte with non-flammability and zero self-extinguishing time, and can make the graphite negative electrode and high-voltage LiNi0.5Mn1.5O4 positive electrode run stably.Professor Yamada said:\"Unexpectedly, the new electrolyte solvent can increase the battery voltage from the current 3.8 V to 4.6 V and also extend the battery life.\"
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