Are fluoride-ion batteries the future of electrochemical energy storage?

Fluoride-ion batteries (FIBs) have recently emerged as a candidate for the next generation of electrochemical energy storage technologies. On paper, FIBs have the potential to match or even surpass lithium-metal chemistries in terms of energy density, while further eliminating the dependence on strained resources, such as lithium and cobalt.

Why are liquid fluoride-ion electrolytes used in batteries?

The motivation behind developing liquid fluoride-ion electrolytes for batteries is to achieve better ionic conductivity in the electrolyte and a wider ESW. Although alkali metal fluorides are readily available, their solubility in commonly used high-boiling organic solvents is usually less than 0.05 M .

Can fluoride-ion batteries be stable at room-temperature?

This work offers a new pathway for clearing the formidable bottlenecks in developing high-performance Fluoride-ion batteries. We demonstrated that stable room-temperature fluoride-ion batteries can be achieved by tailoring the solvation chemistry of non-aqueous liquid electrolytes.

Are metal fluorides effective in energy conversion & storage?

Thanks to the efforts of researchers, metal fluorides have shown promising performance in the field of energy conversion and storage, as demonstrated by their remarkable application prospects (Figure 2).

What are fluoride-ion batteries?

Fluoride-ion batteries (FIBs), which employ fluoride ions as charge carrier shuttling between electrodes, have been considered a promising candidate among beyond-LIB systems . The abundance of fluorine on Earth makes the materials for FIBs potentially very cost-efficient .

What is a fluoride shuttle battery?

Room-temperature fluoride shuttle batteries based on a Fluorohydrogenate ionic liquid electrolyte. Reversible electrochemical reaction of a fluoride shuttle battery with a bismuth (III) fluoride electrode and electrolyte containing Triphenylboroxine as an anion acceptor.