Researchers at Monash University in Australia joined forces with industrial solutions developer Calix Limited, New South Wales, Australia, to create a new chemistry that overcomes the safety and performance issues that are hindering progress when it comes to higher power batteries for energy storage and vehicle applications, Mining.com reports.
“Higher voltage and power batteries are on the drawing board but cannot use the hexafluorophosphate salt,” Doug MacFarlane, one of the study’s co-authors, said in a media statement.
To replace the commonly used salt, MacFarlane and his colleagues developed fluoroborate salts, which are safer because they are not affected, even if exposed to air.
To synthesize the new salts with battery-grade purity, the scientists carried out a recrystallization process.
According to Binayak Roy, co-author of the paper, when combined with a novel cathode material in a high voltage lithium battery, this electrolyte far outperformed the conventional salt. Moreover, the salt was found to be very stable on aluminum current collectors at higher voltages, as required for next-generation batteries.
“When put in a lithium battery with lithium manganese oxide cathodes, the cell cycled for more than 1000 cycles even after atmospheric exposure, an unimaginable feat compared to the hyper-sensitive hexafluorophosphate salt,” Roy said.
These results are interpreted as being one step closer to making next-generation electrode materials a commercial reality, particularly when the Monash team’s new electrolyte system is paired with Calix’s lithium manganese oxide electrode material.
The near-future goal of the team is, thus, to turn these new anions into thermally stable, non-flammable liquid salts, making them beneficial for batteries operating at high temperatures.