(TechXplore)—Most of the sodium-ion batteries that have been developed so far have been half-cell batteries, meaning that the anode is made of a standard sodium metal. However, this standard sodium metal becomes highly active when exposed to oxygen or moisture, creating a safety hazard. For this reason, researchers have been exploring sodium-ion batteries in a full cell format, in which the anode is made of an alternative material.
In a new study, researchers have designed and fabricated a sodium-ion full-cell battery that uses sodium titanium oxide nanotubes as the anode material. In addition to greatly reducing the safety risks compared to sodium-ion half-cell batteries, the new battery can store nearly the same amount of energy in a given volume as today’s state-of-the-art lithium-ion batteries. Although the new battery’s energy density (220 Wh/kg by itself, or an estimated 130 Wh/kg when fully assembled) is not as high as that of the best sodium-ion half-cells, it is the highest achieved so far for sodium-ion full-cell batteries. A high energy density ultimately translates to longer battery lifetimes and—when used in electric vehicles—longer driving ranges.
The researchers, led by Guihua Yu at The University of Texas at Austin, have published a paper on the new high-energy sodium-ion full-cell battery in a recent issue of Energy & Environmental Science.
H/t reader kevin a:
“Will be interesting, Lithium will be worth nothing..”
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