Honda Scientists, Caltech, NASA Develop New Battery Chemistry

Honda Scientists, Caltech, NASA Develop New Battery Chemistry
Honda research scientists along with researchers at Caltech and NASA Jet Propulsion have developed fluoride ion battery technology that could be a breakthrough for EVs. (Photo: Honda)

Honda recently announced that Scientists from Honda Research Institute have collaborated with researchers at the California Institute of Technology (Caltech) and NASA’s Jet Propulsion Laboratory to create a new battery chemistry.

This new chemistry aims to utilize materials with a higher energy density and more favourable environmental footprint than current battery technologies.

The joint study reports that the research team has opened new doors in the development of high energy-density batteries.

These batteries are seen as capable of meeting rapidly growing energy storage needs (including electric vehicles) by overcoming the current temperature limitations of fluoride-ion battery (FIB) technology and by demonstrating the room-temperature operation of fluoride-ion based energy cells.

“Fluoride-ion batteries offer a promising new battery chemistry with up to ten times more energy density than currently available Lithium batteries,” said Dr. Christopher Brooks, Chief Scientist, Honda Research Institute, and a co-author of the paper. “Unlike Li-ion batteries, FIBs do not pose a safety risk due to overheating and obtaining the source materials for FIBs creates considerably less environmental impact than the extraction process for lithium and cobalt.”

FIBs are seen as offering an attractive alternative to other types of potential high-energy battery electrochemistries, such as those based on lithium- or metal hydride chemistries, which are generally limited by the inherent properties of their electrodes.

Due to the low atomic weight of fluorine, rechargeable batteries based on the element could, in theory, offer very high energy densities–up to 10 times greater than the theoretical values for lithium-ion technologies. However, while FIBs are considered a strong contender for the “next-generation” of high-density energy storage devices, they are limited by necessary temperature requirements.

Currently, solid-state fluoride ion-conducting battery iterations need to operate at elevated temperatures–above 150 degrees Celsius–to make the electrolyte fluoride-conducting. According to the paper’s authors, these limitations in the electrolyte have presented a significant challenge for achieving low-temperature operating FIBs.

To address this, the research team found a method for creating a fluoride-ion electrochemical cell capable of operating at room temperature–a breakthrough made possible by a chemically stable liquid fluoride-conducting electrolyte with high ionic conductivity and a wide operating voltage. The scientists developed the electrolyte using dry tetraalkylammonium fluoride salts dissolved in an organic, fluorinated ether solvent. When paired with a composite cathode featuring a core-shell nanostructure of copper, lanthanum and fluorine, the researchers demonstrated reversible electrochemical cycling at room temperature.

Because of their higher capacity nature, FIBs could power future battery-electric vehicles as well as power products, thereby increasing both practicality and potentially, consumer demand for EVs.

More details on the report are available by clicking here.

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